The transmitter can be used in applications where a hygienic design is required. The rugged construction of the transmitter makes it suitable for installations where solid particles are in the liquids.

The PD 340 transmitter is equipped with a microprocessor, which controls and supervises all of its functions.

This manual is applicable to Flow Transmitters marked with C or CE on the electronic module.

1.2 Features

· Sanitary design

· Maintenance-free, no moving parts

· Automatic zero point correction

· Bi‑directional flow

· Volumetric measurement in m³, litres, U.S. gallons etc.

· Pulse output to an electronic counter, 0‑1000 pulses per second

· Pulse output to an electromechanical counter, 0‑10 pulses per second

· Current output, 4‑20 mA (extended version)

· Batch control function

· Limit switch function

· Flow regulator function (PI controller)

· Practically no loss of pressure

· A display unit, PD 210, can be simply connected. The PD 210 unit can display accumulated volume, Setpoint for Batch control or PI regulator, flow rate, temperature, etc.

· Count stop/clear logic input function.

· Temperature measurement using an external temperature detector

· Temperature compensated flow measurement

· Continuous Selftest, which can be monitored through the P‑NET

· P‑NET Fieldbus Communication

· EMC approved (89/336/ECC)

· Vibration approved (IEC 68-2-6 Test Fc)

1.3 Construction

The PD 340 Flow Transmitter consists of three parts:

· Meterhead

· Electronic module

· Terminal box

The electronic module and the terminal box are the same for all sizes of transmitter.

The Meterhead consists of a stainless metering pipe with clamp connections. Two magnet coils are mounted external to the metering pipe. Two stainless electrodes are mounted inside the metering pipe.

The measuring section is designed so that changes in flow profile do not affect meter accuracy. Hence the transmitter has a wide range of flow rates within its linear accuracy. Changes from laminar to turbulent flow do not affect the linear accuracy, and changing viscosity has no affect on meter accuracy. The calibration of the meterhead is carried out during manufacture using a computer controlled calibration facility.

The Electronic Module is micro‑processor based and controls both the sequence of measurement and output signal transmission.

The use of the micro‑processor has enabled a compact design to be achieved yet enabling many functions.

The electronic module is available in three versions, standard, extended with current output and extended with 3-phase output. See appendix 1 for further details.

The standard version has two pulse output signals and one logic input. The transmitter can also be directly connected to a display unit.

In the extended version with current output, one of the pulse output signals can be changed into an analog current output signal, 4‑20 mA.

In the extended version with 3-phase output, the normal separate pulse output signals are transformed to a combined 3-phased output signal.

On both extended versions it is possible to connect the transmitter to a P-NET Fieldbus (data communication network) for central data collection or control.

The Terminal Box is completely separated from the electronic module. Connections can therefore be changed without disruption to the electronics. All terminals within the terminal box are clearly marked with both number and function.

The box is also equipped with 3 cable glands, type PG 11.

Figure 1: System diagram

1.4 Operating principles

The meterhead consists of a metering pipe and two magnetic coils. When a current is applied to the coils a magnetic field is produced at right angles to the metering pipe.

With a conductive liquid flowing through the metering pipe an electrical voltage is induced and measured by two electrodes mounted in the metering pipe. This voltage is proportional to the average velocity of flow and therefore to the volume flowing.

The PD 340 Flow Transmitter utilizes a square measurement chamber. The shape of the measurement chamber significantly reduces the influence of viscosity, type of liquid, and flow profiles.

Practical tests with the PD 340 confirm that it is not necessary to recalibrate the meter when changing product, for instance from water to milk. This would normally be necessary when using mag meters with traditional round measuring chambers.

Figure 2: Operating principles

· Ue = K x B x V x D

· Ue = voltage across electrodes

· K = system constant

· B = magnetic field

· V = average velocity

· D = distance between electrodes

The micro‑processor in the transmitter controls the current generator keeping the magnetic field constant. The voltage across the electrodes is amplified and converted to a digital value from which the micro‑processor calculates the liquid flow.

2 Function description

The Flow Transmitter holds a number of internal functions and connections for external signals. The functions may be selected by keying in a set of configuration parameters. Calibration parameters may also be set. The data may be entered via a display/keyboard unit or via the P‑NET.

The Flow Transmitter may be scaled to operate in any volumetric units, Litre, m³, Gallon etc. The flow rate may be selected to be displayed as volume unit/hour or /minute.

2.1 Flow measurement

The flow rate may be filtered to stabilize the readout of an unstable flow. Flow rates below 0.2 % may be ignored. This may be useful to avoid totalizing the volume during long periods with no flow (see configuration of function selector Code3).

The flow is measured in both directions. Flow following the arrow on the meter head will be indicated as positive flow. Optionally the negative flow may be ignored and set to zero (see configuration of function selector Code3).

To compensate for the expansion of the liquid, the Flow Transmitter may be configured to indicate a flow as if the liquid temperature was at 4 °C (see also T.C. Flow).

2.1.1 Test mode

The Flow Transmitter may be set in test mode. During installation and service, the test mode may be used to simulate that liquid is flowing in the pipe system. All output signals, pulse signals as well as current signal will act as if the liquid flow was present. This way, all internal functions, external signals and cable connections may be checked (see configuration of function selector Code2).

2.2 Volume counter

The Flow Transmitter utilizes two independent totalizers, Volume1 and Volume2, which indicate the measured volume since they were cleared. Each volume counter may independently be cleared or preset to a specific value (see further details in the Volume1 description).

2.3 Automatic functions

A number of automatic functions are selectable in the Flow Transmitter. Only one of the functions should be selected (see configuration of function selector Code2 how to select each function).

2.3.1 Batch Control

The Flow Transmitter has a built-in batch control function, and can therefore easily be used to control the dosing of a specified volume. The requested volume is keyed into a setpoint register. A digital input on the Flow Transmitter may be used to start the batch control. A digital output, Output2, opens the dosing valve or starts a pump, when the setpoint volume is reached, the output is switched off and the valve is closed or the pump stops. The Volume2 counter shows the dosed volume.

2.3.2 Flow control

In systems where it is desirable to have a constant flow, the Flow Transmitter with the built-in Flow Control function may be used directly to control a valve or pump. The requested flow rate is keyed into a setpoint register and the internal PI controller will control the valve or pump by means of the current output signal (4-20 mA).

See the Flow control application example.

2.3.3 Limit switch

The Flow Transmitter has a built-in limit switch function. This function may be used to indicate if a measuring value is below or above the value in the setpoint register. As an example this may be used to indicate a high/low flow rate. The indication may appear on a digital output, Output2, as ON or OFF (see configuration of function selector Code2 to select this function for Output2).

2.4 Temperature measurement

The Flow Transmitter can measure temperature by connecting an external temperature detector, type Pt‑100. The temperature may be read in a register as °C or °F (see configuration of function selector Code3). This is necessary for temperature compensated flow measurement.

2.5 Output1

Output1 is a power supply output, which can be used to supply an external counter or relay circuit (see further details in chapter 5.2).

2.6 Output2

Output2 can be selected for one of several functions (see configuration of function selector Code2):

· Pulse signal, 0‑10 Hz. The signal may be taken to a counter, electronic or electromechanical, for indication of the total volume, e.g. in litres (see chapter 5.3.1Output2).

· Sign for Output3. The signal indicates the flow direction. The output is switched OFF, when the flow is positive. By means of an UP/DOWN‑counter this signal may be used for the totalizing of the volume flowing with a sign.

· Control signal from the Batch control function.

· Control signal from the Limit function.

· Error free measurement signal. The output signal is ON if no error is present.

· The output may be controlled directly via P-NET.

Further details for connecting Output2 is found in chapter 5.3.1Output2.

2.7 Output3

Output3 may be used as a digital signal output or as an analogue 4-20 mA current output (extended version PD 366 only). When used as a digital signal, it may be used as a fast pulse signal (0 - 1000 Hz) for external counter circuits (see scaling example in chapter 6) or it may be controlled directly via P-NET. Further details for connecting Output3 are found in chapter 0

Output3.

2.8 Input

The transmitter has a logic input, Input1, which can be selected for one of several functions (see configuration of function selector Code3):

· Stop counters. The signal may come from an air detector, and is then used to make the transmitter stop counting, when there is air in the liquid.

· Clear Volume2 counter. The input can be used in batch control, to start the Batch function and clear the batch volume counter.

· Manual/Automatic mode for PI controller. The input can be used to set the operation mode for the PI controller.

Further details for connecting Input1 are found in chapter 5.4Input signal.

2.9 P-NET Interface

The extended versions of the Flow Transmitter utilize a P-NET fieldbus communication interface. This enables the Flow Transmitter to be connected directly to P-NET. P-NET is a fieldbus network designed for process control and data-collection. P-NET is a RS-485 Serial interface used for communicating with P‑NET interface modules with a transmission speed of 76,800 baud (see chapter 5.7 for further details).

Through the P-NET it is possible to display and change all the internal data within the Flow Transmitter (see a complete list in the Variable Description).

The PD 4000 Flowmeter-Display utilizes the P‑NET interface for data exchange between the Flowmeter-Display and the connected Flow Transmitters. It is possible to change data and to select various functions in the Flow Transmitter. The memory in the Flowmeter-Display is equipped with a battery backup, which will hold the measured data during a power failure.

The P-NET interface may also be used for data collection, eg. from a PC. The PC may be equipped with a PC P-NET interface board, which makes it possible to directly access any variable in the Flow Transmitter and other connected P-NET modules from a PC-program.

2.10 PD 210 display unit

The PD 210 is a local display unit, which is connected directly to the Flow Transmitter. From this unit it is possible to display the flow rate, volume counters, temperature, setpoint etc. Furthermore the PD 210 display unit may be used to change setpoint values and to perform a complete configuration of the Flow Transmitter.

The display unit is connected to the Flow Transmitter with a two-wire cable, up to a length of 100m. The display unit is supplied with power via this cable. It also carries the exchange of data between the Flow Transmitter and the display unit (see description in chapter 3).

3 Display

Various options are available for displaying information from the PD 340 Flow Transmitter. The Flow Transmitter may be controlled and supervised via the P-NET interface (requires one of the extended versions), all data may then be accessed. Another solution is to connect a local display unit to the Flow Transmitter, PD 210. Then only the main data is accessible.

3.1 Local display unit, PD 210

The display unit PD 210 can be connected directly to the transmitter. With this unit you can perform different functions.

· Display of data from the transmitter, e.g. flow or volume.

· Changing of data in the transmitter, e.g. contents of volume register or SET‑point register.

· Configuration and calibration, e.g. setting of the size of the meterhead or the function of the output signals.

· Readout and reset of an internal error code.

3.2 Display registers

The contents of 8 different registers in the transmitter can be displayed on the unit. A touch on one of the 8 buttons under the display selects whichever register you want to read. The display indication is automatically updated about once per sec. Additional details may be found in chapter 6.1.1.
Reg. No.	Name	Function	SWNo
1 2 3 4 5 6 7 8	FLOW T.C.FLOW TEMP “blank” VOL.1 VOL.2 SETP. ”blank”	Liquid flow, e.g. in m³/h Temperature compensated flow Temperature in °C Available register Volume, result of totalization, e.g. in m³ Volume for comparing with SET‑point, e.g. in m³ SET‑point, e.g. in m³ Instant Flow	$11 $12 $13 $14 $15 $16 $17 $18

3.2.1 Changing the register

If a change in the contents of a register is required, the register must first be displayed. Then the desired contents are entered, followed by a touch on the = button. This gives a blank display for approx. 1 sec., and then the new contents are displayed in the normal way.

3.2.2 Configuration and calibration using the PD 210

The Flow Transmitter contains 8 configuration registers. See also chapter 6.1.2 for a detailed explanation and purpose for these registers (the registers are located on SoftWire number 20 to 27). If you want to display the contents of a configuration register, touch the E button, which will turn the display blank. Then touch a numeral key between 1 and 8 to choose a configuration register. The number of the configuration register appears in the first digit of the display, and the contents of the register in the rest of the display. Changing the contents of a register are performed by keying in the new contents, and touch the = button.

3.2.3 Error readout

The user is informed by an "A" for ALARM appearing in the first digit of the display. By pressing the "TEST" button the display will show an error code of two digits, indicating the type of error. The test system ensures that the alarm will not be cancelled before the error code has been displayed by pressing the "TEST" button, even though the error may have disappeared. By pressing the "TEST" button once again, the display will show "0" if the Flow Transmitter is error free now. The error code on the display is only updated by re‑pressing the "TEST" button. A complete list of error codes are given in chapter 6.

3.2.4 Construction

The display unit consists of a LCD‑display, a keyboard and electronics for exchange of data with the transmitter, and control of the display and the keyboard.

The unit is built into a box of NORYL PPO, sealed to IP 65. The dimensions of the box are LxHxD = 144 x 72 x 8 mm. (Standard dimensions for cabinet instruments).

The electronics are based on a micro‑processor, which controls the LCD‑display, scans the keyboard and controls the communication with the transmitter.

3.2.5 Assembly drawing for PD 210

NOTE: Please observe that the M3 mounting screw holes are only 4 mm. deep.

Do NOT screw down beyond this length. This may damage the display unit.

3.3 Flowmeter-Display, PD 4000/340

The Flowmeter-Display is based on a PD 4000 P-NET Controller and is designed to display data from PD 340 Flow Transmitters. Furthermore it is possible to change data and to select various functions in the Flow Transmitters.

The displayed data may be e.g. flow or volume, or a setpoint or filterconstant may be selected for modification.

Up to three Flow Transmitters may be selected and supervised simultaneously on the Flowmeter-Display. The Flowmeter-Display is connected to the Flow Transmitters in a P-NET Fieldbus system.

A standard configuration for a PD 340 Flow Transmitter is stored in the Flowmeter-Display and may be transferred automatically via P-NET to a new Flow Transmitter in the system. The standard configuration may be adjusted to match a specific customer configuration.

The actual configuration for each of the selected Flow Transmitters may be listed in clear text on the display.

Please refer to the Flowmeter-Display manual (502 071) for additional information.

4 Installation

4.1 Selecting the right meter size

The Flow Transmitter has a very large measuring range. The optimal flow measurement is obtained when the flow rate is close to, but below the maximum flow rate for the Flow Transmitter. Flow rates greater than the maximum specified flow rate + 10 % are not measured and therefore not registered. This means that the flow rate must never exceed the maximum specified value.

Practical examples from different installations indicate that the flow rate varies. Therefore it is recommended that the calculated maximum flow rate should not exceed 90 % of the specified maximum flow rate for the selected Flow Transmitter. Exceptions may be made if the flow rate is well known and very stable.

If the operational flow rate for a Flow Transmitter is below 30 % of the maximum flow rate for the Flow Transmitter, it is recommended to select a smaller dimension, if existing.

Flow measurement down to 5 % of maximum flow rate for the Flow Transmitter, or even lower is also possible, but with a reduced accuracy (+/- 1 %).

The size of the meterhead should be selected according to the maximum flow rate. This maximum flow rate must be the absolute maximum flow rate during operation, cleaning, startup etc. The smallest possible transmitter is then chosen for that maximum flow rate. This will ensure optimum measurement accuracy. If the metering section is smaller than the pipework in the installation, the connecting pieces should be tapered.

A Flow Transmitter should not be installed in a pipe construction where the pipes are smaller than the pipes in the connections.

If two products are mixed before measuring, the mixed product must be a homogenous liquid before entering the Flow Transmitter to ensure maximum accuracy.

The Flow Transmitter is available in 5 different sizes as shown in the table below:

Max. flow rate:
C 25	C 38	C 51	C 63	C 76
8 m³/h	20 m³/h	40 m³/h	80 m³/h	120 m³/h

NOTE:The max. flow rate for the Flow Transmitter must NEVER be exceeded. Otherwise the meterhead may be damaged.

4.2 Installation of Transmitter

The transmitter should be installed within the pipe work system such that the metering pipe is always filled with liquid, as the transmitter can register flow, even if the meter is empty.

As the transmitter sees air in the liquid as a volume, the volume of air in the liquid must be reduced to a minimum, and the transmitter should be located in the pipe work system, at the point of maximum pressure. Here the volume of the air is at a minimum and the influence of air on the measurement will also be at a minimum.

If heavy vibrations occur in the pipe work e.g. caused by resonance from pumps, or a pulsating pressure in connection with e.g. a homogenizer or a positive displacement pump, a vibration damping is required, or the transmitter must be mounted somewhere else with less variation of pressure.

If the liquid contains air, an air eliminator should be mounted before the Flow Transmitter.

The transmitter can be mounted both horizontally and vertically. No air must be trapped in the meter head. The positive flow direction is indicated by an arrow on the meterhead.

To create the best conditions for precise metering, a straight pipe run of least three times the pipe work diameter should be mounted upstream and downstream of the transmitter.

When selecting the location of the transmitter it must be ensured that the ambient temperature is within the specified limits. Finally, the transmitter should be installed such that the electronic module and the terminal box can be fitted and dismantled in situ.

NOTE:The clamp connections must be loosened completely before the transmitter is rotated. Otherwise the meterhead may be fatally damaged.

Precautions must be taken to ensure that neither the electronic module, the meterhead nor the terminal box are exposed to moisture, when the transmitter is dismantled. To prevent moisture, the cables must be mounted correctly in the glands. The electronic module and the terminal box must be carefully mounted with all screws tightened.

The Flow Transmitter supply should always be connected, as heat developed in the electronic module prevents condensation, which could damage the transmitter. As soon as possible after mounting, the transmitter should therefore be powered up.

5 Electrical connections

The figure below shows the terminal board with all the electrical connections for the Flow Transmitter. The program enable switch, SW1 located in the upper left corner, must be in the ON position to configure and calibrate the Flow Transmitter. After configuration and calibration the switch must be set in the OFF position.

Figure 3: Electrical connections in Terminal Board

5.1 Power supply

The power supply for the Flow Transmitter may be 24 V DC or 24 V AC.

If the conductivity for the liquid is below the specified 5 μs/cm, it might still be possible to measure the flow. To do this, the Flow Transmitter must be connected to a separate DC power supply where the -24 V DC terminal must be connected to the piping system.

This will increase the sensitivity and flow measuring may be possible.

5.2 Output1

Output1 on the terminal board is a voltage supply, which can be used to supply an external counter circuit, relays or current devices (4-20 mA).

The voltage at the output can vary from 20 to 40 V DC, depending on the power supply voltage (Supply voltage - 2 V as minimum).

Figure 4: Power supply output electrical

The voltage supply is connected directly to a bridge circuit, which rectifies the power supply voltage to the transmitter. The output is protected with a zener diode and a current‑limiting resistor in the same way as the pulse outputs. Furthermore, the output is isolated from the internal electronics by a transformer. The output is not isolated from the power source supplying the transmitter.

5.3 Digtal output signals

The Flow Transmitter has two digital output signals, Output2 and Output3. Voltage supplies are required for output signals.

The outputs are isolated from the other part of the electronics by optocouplers. Furthermore, the outputs are protected against overload by a zener diode and a current‑limiting resistance, R_PTC. R_PTC is about 25 Ohm at normal load (max. 100 mA). At overload, the R_PTC will rise rapidly thus limiting the current to about 16 mA.

If an output has been overloaded, the current must be completely switched off for some seconds, by switching off the power supply to the Flow Transmitter, before the output can be normally loaded again.

A voltage drop of up to 1.0 V may occur when the output is switched ON. This should be noted when connecting to low voltage external equipment.

In case of wrong polarization of the connection, the signal acts as a constant ON signal.

5.3.1 Output2

The pulse output signal from Output2 has a pulse width of 40 ms. The frequency is continuously variable from 0‑10 Hz.

Pulse signal Output2

Example of electrical connection of electro‑mechanical counters.

Counter specification:

Supply voltage: 20‑40 V DC

Power consumption: Max. 2.5 W

Counting frequency: Min. 10 Hz

ON‑time: Typ. 40 ms

OFF‑time: Min. 60 ms

5.3.2 Output3

The standard version of the Flow Transmitter can generate a pulse output signal at Output3. A voltage supply is required for this pulse output signal.

The current output extension board, PD 366, for the Flow Transmitter can generate two different output signals at Output3, pulse output signal or analog current output signal. Voltage supplies are required for both types of signals.

The pulse output signal from Output3 is symmetrical (50 - 50 % duty cycle), and the frequency is continuously variable from 0‑1000 Hz.

Electronic counters and PLC's are normally connected to the pulse output, Output3.

The pulse output in the transmitter consists of a voltage free electronic switch contact. Therefore, it is necessary to equip the count pulse input on the counter/PLC with a pull‑up resistance, if the counter/PLC has no internal pull‑up.

The pull‑up resistance R1 should be chosen so that the current I is approx. 5 mA when the contact in the Flow Transmitter is switched on.

5.3.3 Output3, current output

The current output signal is in the range from 4 - 20 mA. The current output may be taken to a regulator for controlling the liquid flow.

The current output from Output3 is working as a variable resistance. Therefore it requires an external supply voltage, which can provide min. 12 V at the terminals 17 and 18 in the Flow Transmitter + the voltage drop across the load and cable. The necessary supply voltage must be calculated for max. current, 20 mA.
The current output is isolated from the other part of the electronics and protected against overload in the same way as the pulse outputs. However, the current‑limiting resistance R_PTC is designed so that overload protection comes into force at about 35 mA.

Supplied by internal voltage supply (Output1).

Supplied by an external power supply.

5.4 Input signal

The input signal is galvanically isolated. To activate the input, a voltage of minimum 18 V must be connected to the terminals with the right polarization. This voltage may be supplied from either the internal voltage supply or an external power supply.

5.5 Temperature signal, Pt-100

A standard Pt-100 temperature sensor may be connected to the Flow Transmitter. The temperature sensor must be connected with a 4-wire cable all the way from the sensor to the terminal box. This must be done to avoid errors influenced by the cable, junctions and connections.

NOTE:If a temperature sensor is not used, the terminals 9‑10‑11‑12 must be connected together to avoid errors in the flow measurement.

5.6 Connecting the display unit, PD 210

The display unit is connected to the Flow Transmitter with a two wire twisted cable, up to a length of 100m. The display unit is supplied with power via this cable. It also carries the exchange of data between the Flow Transmitter and the display unit.

The communication speed between the Flow Transmitter and the PD 210 display unit is 300 bit/sec, resulting in a new data readout approx. each second.

To improve the electrical noise immunity at long distance cables, a shielded cable is recommended. The shield must then be connected to terminal 8 at the terminal box and not connected at the display unit.

5.7 P-NET connections

The P-NET is a multi drop bus, which is connected in a physical ring. Up to 125 units can be connected to the bus, where a unit may be a PD 340 Flow Transmitter, a Flowmeter Display or another P-NET interface module. The P-NET interface is galvanically isolated. The bus cable is a twisted pair with shield, and the shield is used as a potential equalizer between the driver/receiver circuits in the nodes connected to the bus.

A P-NET unit is connected to the bus by means of 3 terminal-connections, the A terminal, the B terminal and the S terminal.

The connection from one unit to the next unit is performed by connecting A to A, B to B and S to S. The S terminal must not be connected to ground. If the length of the cable is more than 100 m, the bus cable will have to be connected from field device to field device, forming a physical ring.

Electrical specification for P-NET:

Bus structure:

A physical ring without termination.

Medium:

Shielded twisted pair cable with minimum .22 mm² area conductors and characteristic impedance of 100-120 ohm. For example TWINAX IBM part No. 7362211 with 105+/-5 ohm, 51 pF/m.

Bus length:

Max 1200 m (EIA RS 485).

6 Variable description

PD 340 Flow Transmitter holds a number variables and functions, which all may be accessed via P-NET and some via the PD 210 display unit.

6.1 SoftWire Table

The variables in the PD 340 Flow Transmitter are located on logical addresses called SoftWire numbers. These variables include the size of the meterhead, setpoint for the PI regulator, function of output signals etc. A survey of these variables and related SoftWire numbers are given in the following SoftWire table. The memory type is explained in Appendix 2.

At delivery, the transmitter is programmed for the functions specified on the order.

SWNo

(hex)

Identifier

Memory type

Read

out

Type

Unit

SerialNo

DeviceType

PrgVers

Error3

Output2

Output3

Input1

BatchStart

Flow

TcFlow

Temperature

Available

Volume1

Volume2

SetPoint

InstantFlow

MeterSize E1

Ti E2

PICode E3

MeterNumber E4

Scale E5

Code1 E6

Code2 E7

Code3 E8

Special function

PROM Read Only

RAM Read Write

RAM Read Only

RAM Read Write

RAM RPW

RAM Read Only

RAM Init EEPROM

RAM Read Write

RAM Init EEPROM

RAM Read Only

EEPROM RPW

RAM Init EEPROM

PROM Read Only

RAM Init EEPROM

EEPROM RPW

Hex

Decimal

Hex

Decimal

Hex

Decimal

Hex

LongInteger

Integer

Byte

Real

LongInteger

Real

LongInteger

NOTES:

1. Flow may be read out as 'unit/min' or 'unit/hour'

2. The unit for Temperature may be °C or °F

3. The unit for Flow depends on the calibration factor inserted in MeterSize.

4. If Output3 is regulator, the SI unit for Scale must be the same as for Flow.

P-NET SWNo 0: SerialNo PD 210 display: not accessible

This register contains a production number, which is set by PROCES-DATA, and it cannot be changed. The serial number is printed on the side of the Flow Transmitter.

The serial number is used for service purposes and as a 'key' to set the P-NET number for the Flow Transmitter. When setting the P-NET number, the least significant byte in the serial number holds the P-NET number, thus the serial number is contained in the 3 most significant bytes (6 digits).

Setting the P-NET number via the serial number is done by writing into the serial number (possibly with receiver number = $7E (hex)).

The last data byte must hold the P-NET number for the Flow Transmitter. The first 3 bytes must contain the same serial number, which already was in the 3 most significant bytes. If the two serial numbers are not identical, the P-NET number will not be set.

Read out of the P-NET number via the serial number is done by reading the serial number and then masking for the least significant byte (possibly with receiver number = $7F (hex)).

NOTE: When reading the P-NET number / serial number with receiver number = $7F, all modules on the P-NET will answer, thus only one module must be connected to the P-NET. When setting the P-NET number via the serial number with receiver number = $7E, all modules on the P-NET will receive the message, but will give no reply (as in a normal transmission), hence a transmission error is generated.

P-NET SWNo. 1: DeviceType PD 210 display: not accessible

This register holds information on the type of device, and may only be read out via P‑NET. The device type for the Flow Transmitter is 340.

P-NET SWNo. 2: PrgVers PD 210 display: not accessible

This register holds information on the program version, and may only be read out via P-NET. The current program version is 8701.

P-NET SWNo. 3: Error3 PD 210 display key: TEST

The flow transmitter is equipped with a comprehensive test system, which is able to disclose faults, arising from improper use of the transmitter or faults arising from the transmitter during use. When the test system registers a fault, an error code is generated and saved in this register. If more than one error occurs at the same time, only the highest error code will be saved. The error code will be saved until it has been read out. By reading out the error code twice, one can see if the error has disappeared again. The error codes F0 through F4 can only be read out via P-NET. By writing $FF (hex) in Error3, the Flow Transmitter will perform a Reset and error code $F2 will be generated.

The display unit PD 210 will show the text "P.FAIL" after resetting the transmitter what ever caused the reset.

ERROR CODE FAULT TYPE

F4 RESET due to internal error

F3 RESET due to internal error

F2 RESET due to $FF in error code via P-NET

F1 RESET due to internal error

F0 RESET due to power cut

83 Error in program storage (PROM)

82 Error in program execution - watchdog

81 Error in data storage (RAM)

80 Error in program execution

76 Error in EEPROM-storage

75 Error in RAM-storage or EEPROM-storage

64 Improper connection of temperature detector

63 Improper connection of temperature detector

62 Temperature detector disconnected

54 Magnetic coil in meter head disconnected

(may also occur from empty metering pipe in C marked meters)

52 Magnetic coil in meter head short-circuited

(may also occur from empty metering pipe in C marked meters)

44 Shunt in meter head defective

43 Shunt in meter head defective

42 Shunt in meter head defective

24 Temperature >> max

23 Temperature > 130 °C / 266 °F

08 Overrun, volume counter 2

07 Overrun, volume counter 1

05 Input active

04 Flow >> max / metering pipe empty

03 Flow > max

02 Overflow, Output2

01 Overflow, Output3

P-NET SWNo. 4: Output2 PD 210 display: not accessible

This register may be used to control Output2 and holds information about the current state for the output.

If an automatic function is selected for Output2, the output cannot be controlled via this register, but the automatic function will control the state of Output2.

Output2 = 00=> Output OFF

Output2 = 01=> Output ON

P-NET SWNo. 5: Output3 PD 210 display: not accessible

This register may be used to control Output3 and holds information about the current state for the output when it is used as a simple digital output.

If an automatic function is selected for Output3, the output cannot be controlled via this register, but the automatic function will control the state of Output3. In this case the state for Output3 will change rapidly, depending on the output pulse frequency or current output value and there is not much point in reading the state.

Output3 = 00=> Output OFF

Output3 = 01=> Output ON

P-NET SWNo. 6: Input1 PD 210 display: not accessible

This register holds information about the current state for Input1. Input1 cannot be controlled.

Input1 OFF => Input1 = 00

Input1 ON => Input1 = 01

P-NET SWNo. 7: BatchStart PD 210 display: not accessible

When the Output2 function is set to batch control, batching is started either by activating Input1 or by inserting 01 in this register. The register is reset immediately, the volume counter Volume2 is cleared, Output2 will go ON and dosing starts.

6.1.1 Process variables

P-NET SWNo. 11: Flow PD 210 display key: FLOW

This register shows the current Flow rate for the liquid in the Flow Transmitter. The Flow rate is an averaged value, where the time constant for the digital filter and the time unit may be selected in the Code3 register. The time constant for the filter can be chosen in the interval from approx. 0.15 sec. to approx. 10 sec. Reverse flow (relative to the arrow on the meter head) can be set to 0, as well as Flow rates smaller than 0.2% of max. flow can be set to 0 (selected in Code3).

P-NET SWNo. 12: TCFlow PD 210 display key: T.C.FLOW

In addition to the normal flow measurement, the Flow Transmitter also measures a temperature, which may be used to calculate a temperature compensated flow.

The calculation of the temperature compensated flow is performed to compensate for the expansion of the liquid as a function of the liquid temperature.

The Flow Transmitter automatically calculates the temperature compensated flow by multiplying the flow rate by a temperature dependant correction factor, K.

The temperature compensated flow, TCFlow, may be read directly in this register.

The relation between temperature and K is stored in the Flow Transmitter and is shown below.

Implementing an automatic calculation of TCFlow in the entire temperature range requires a Pt-100 temperature sensor to be connected at the terminals 9, 10, 11 and 12.

Temperature compensation may be implemented for liquids at fixed temperature without using a Pt-100 temperature sensor. This is showed in the following example:

The liquid is at a fixed temperature of 75 °C during production, no Pt-100 sensor is connected, but temperature compensated flow is wanted for the volume counters.

The value for the correction factor K is read from the above diagram, 0.975. This value is now multiplied with the value from SWNo. 20 (PD 210: E1), Metersize and stored back in Metersize. The Code2 register, digit 4 must be 1 to select Flow as data for volume counters.

NOTE:Using this kind of temperature compensation will only give the correct result when the liquid is at the fixed temperature.

P-NET SWNo. 13: Temperature PD 210 display key: TEMP

This register shows the temperature, calculated relative to the Pt-100 detector connected to the Flow Transmitter. If the four terminals for the temperature detector are short-circuited, the calculated temperature will be approx. -245 °C, equal to -409 °F. The calculation unit for temperature is selected in the Code3 register.

P-NET SWNo. 14: Available PD 210 display key: "blank"

The Available register has several functions depending on the selected options for Output3 and Batch control / Limit switch:

· If the Output3 function is set to current output with PI-regulator, the Available register contains the output value from the regulator. The output value will be in the range from 0 to 100%, corresponding to 4-20mA or 20-4mA depending on the selection in the PICode register. If the PI-regulator is in Manual operation, then a value may be written into the Available register, giving the output value for the current output.

· The Available register may be used as Data input for Batch control / Limit switch.

· If none of the above options are selected, this register may be used as a free register.

P-NET SWNo. 15: Volume1 PD 210 display key: VOL.1

This register shows one of the two internal volume counters in the transmitter. The counter increments when the flow is positive and decrements when the flow is negative.

The read-out resolution (number of digits after the decimal point) on the PD 210 display unit for the counter is chosen in the Code1 register. This read-out resolution also determines the overflow value for the counter. The counter value uses a total of 6 significant digits including the digits after the decimal point.

When the counter has reached it's maximum, error code 07 is generated, and the counter starts from 0 again. The maximum value for the counter is reached when all 6 significant digits show the value 9. The corresponding volume depends on the counter resolution. If the resolution is 3 digits after the decimal point and the meter size is inserted in m³, maximum will be 999.999 m³ - even if there is no PD 210 display unit connected to the transmitter.

P-NET SWNo. 16: Volume2 PD 210 display key: VOL.2

The Volume2 counter is similar to the Volume1 counter, though error code 08 is generated at overflow. Furthermore it is possible to clear Volume2 by means of Input1 or Batchstart.

P-NET SWNo. 17: Setpoint PD 210 display key: SETP.

The Setpoint register has several functions depending on the selected options for the PI-regulator and Batch control / Limit switch:

· If the Output3 function is regulator, the setpoint for the regulator is inserted here. The setpoint is inserted in the same unit as the amount to be regulated - e.g. m³/h.

· If the Output2 function is Batch control, the setpoint for the batching is inserted here. After batch start (via Input1 or BatchStart) Output2 will be ON until the volume counter has reached the Setpoint. This function works for positive values only.

· If the Output2 function is Limit switch, the limit is inserted in this register. If data for the limit switch is below the limit, Output2 will be OFF. If data is above the limit, Output2 will be ON.

As Setpoint may be used for Output2 as well as Output3, it is not possible though to choose regulator function for Output3 and batch control or limit switch function for Output2 at the same time.

P-NET SWNo. 18: InstantFlow PD 210 display key: "blank"

This register shows the flow directly as it is measured in the transmitter.

· The read out is without smoothing through the digital filter

· Reverse flow is shown

· Flowrates lower than 0.2% of maximum flow is shown

· The actual flow is shown - even if the transmitter is in TEST-mode.

6.1.2 Configuration and calibration parameters

P-NET SWNo. 20: MeterSize PD 210 display address: E1, Size of Meter

The meter size, stated on the meter head, is inserted in this register. On the meter head the meter size is stated in m³/h. If another volumetric unit is desired, the value in MeterSize is converted to this unit and stored as the calibration factor. This value must always be stated in volume units per hour - even if the de sired Flow read out is volume per minute.

Example: On the meterhead the meter size is stated as 80 m³/h. The desired volume unit is litres. Insert 80000 in MeterSize.

P-NET SWNo. 21: Ti PD 210 display address: E2, Integration time Ti

Ti is the integration time constant for the PI-regulator, which is the time it takes for the I‑component of the regulator to give the same change in the output signal as that made by the P-component, following a permanent change of the input signal.

See also the application example Flow control.

Please consult the scientific literature in this field for further information on how to set the regulator parameters.

P-NET SWNo. 22: PICode PD 210 display address: E3, PI-regulator function

The content of this register defines the function of the PI-regulator and the current output (where in determines the calculation of the input signal and out determines control direction for the current output). The register also holds an operation mode selector (Manual/Auto).

The data type for PICode is a LongInteger, which may be considered as 8 digits in hexadecimal readout. The first 6 digits represent and select an optional function. Digit 7 and 8 are not used and should be set to 0. The information must be interpreted as shown below (only digits 1 to 6 are applicable to the PD 210 display unit):

Va l.	Dig. 1	Dig. 2	Dig. 3	Dig. 4	Dig. 5	Dig. 6	Dig. 7	Dig. 8
Va l.					Regulator Function	Regulator operation mode
0	0	0	0	0	in=setpoint-data out 0-100%:4-20mA	Auto	0	0
1					in=data-setpoint out 0-100%:4-20mA	Manual
2					in=setpoint-data out 0-100%:20-4mA	Input ON => manual operation
3					in=data-setpoint out 0-100%:20-4mA

P-NET SWNo. 23: MeterNumber PD 210 display address: E4, Meternumber

From this register the Flow Transmitter's serial number may be retrieved. This number is set by PROCES-DATA and is for service purposes only. The serial number is printed on the side of the Flow Transmitter.

P-NET SWNo. 24: Scale PD 210 display address: E5, Output3 scaling

This register is used for the scaling of Output3 when it is used as pulse output or current output.

If the Output3 function is pulse output, 0 to 1000 Hz, the number of volume units per pulse is stated in Scale.

Example: The meter size (MeterSize is read in E1 at the PD 210 display unit) is 20000 litres per hour. The requirement is 0.01 litres per pulse on Output3 (equal to 100 pulses per litre). The figure 0.01 is then inserted in Scale (E5 on PD 210).

In this example a flow of 20000 litres per hour will give a Output3 frequency of

NOTE: Be sure that the frequency on the output does not exceed 1000 Hz.

If the Output3 function is current output, 4 - 20 mA, Scale will indicate the full-scale value of the data for the current output.

Example: Full scale (20 mA) is desired on the current output at 15000 litres per hour. The number 15000 is inserted in Scale. 4 mA always equals a measuring result of 0.

If the function of Output3 is PI-regulator, Scale will indicate the proportional band of the regulator. The proportional band for a regulator is the change required in the input signal to give a change from 0 to 100% in the output signal (without I). The proportional band is defined in the same unit, as the input signal to the regulator - e.g. m³/h.

See also the application example, Flow control.

Please consult the scientific literature in this field for further information on how to set the regulator parameters.

P-NET SWNo. 25: Code1 PD 210 display address: E6, Display resolution

Using the display unit, various measuring results may be read out from the Flow Transmitter. For these values, Code1 determines how many digits to appear after the decimal point. The resolution may be in the range from 0 to 6.

The data type for Code1 is a LongInteger, which may be considered as 8 digits in hexadecimal readout. The first 6 digits represent and selects the resolution for one register. Digit 7 and 8 are not used and should be set to 0. The information must be interpreted as shown below (only digits 1 to 6 are applicable to the PD 210 display unit):

Digit 1	Digit 2	Digit 3	Digit 4	Digit 5	Digit 6	7	8
Flow	TCFlow	Volume1	Volume2	Setpoint	Instantflow

For digit 3, Volume1 and digit 4, Volume2, the resolution determines also the maximum value for the counters, i.e. the overflow value. See also the description for Volume1.

Example: The size of the transmitter is 80 m3/h. Flow is requested on the display with a resolution of 0.01 m3/h. Set digit 1 in Code1 equal to 2 (2 digits after the decimal point).

When the Output2 function is pulse output, 0 - 10 Hz, the resolution on Volume1 indicates the resolution on the display read out as well as the pulse output. Output2 will give a pulse each time the least significant digit changes on the display.

Example: In MeterSize the size of the transmitter is specified to be 20 m³/h. On Output2, 1 pulse is required for each 0.01 m³ (10 litres). Digit 3 in Code1 is set to 2 (2 digits after the decimal point).

At a flow of 20 m³/h the frequency on Output2 is:

NOTE:Resolution must be chosen so the frequency on Output2 does not exceed 10 Hz.

P-NET SWNo. 26: Code2 PD 210 display address: E7, Function selector Code2

The contents of Code2 defines the functions of Output2, the functions and control data for Output3, data for volume counters, data for the batch control / limit switch and the operation mode for the Flow Transmitter.

The data type for Code2 is a LongInteger, which may be considered as 8 digits in hexadecimal readout. The first 6 digits represent and select one of the above-mentioned options. Digit 7 and 8 are not used and should be set to 0. The information must be interpreted as shown below (only digits 1 to 6 are applicable to the PD 210 display unit):

Va l.	Dig. 1	Dig. 2	Dig. 3	Dig. 4	Dig. 5	Dig. 6	7	8
Va l.	Function Output3	Data for Output3	Function Output2	Data for vol counter	Mode	Data for batch/limit
0	No function	No function	No function	No counting	Normal	No batch/limit	0	0
1	PI-regulator	Flow	Pulse output 0 - 10 Hz	Flow		Flow
2	Current output, 4-20mA	TCFlow	Batch control	TCFlow		TCFlow
3		Temp				Temp
4	Pulse output, 0 - 1000 Hz	Available	Limit switch			Available
5						Volume1
6			Error code=0			Volume2
7
8		Instantflow	Sign for Output3	Instantflow	TEST	Instantflow

If PI-regulator is selected for Output3, then it is not possible to select Batch control or Limit switch for Output2 at the same time, while the Setpoint register is used for both functions.

Output2 function Sign for Output3 means Output2 is ON for positive flow.

During TEST‑mode the flow is not calculated by the transmitter, and can thus be inserted in the Flow register, e.g. by the display unit.

See also the Flow control application example in chapter Flow control for a specific configuration of the Code2 register.

P-NET SWNo. 27: Code3 PD 210 display address: E8, Function selector Code3

The contents of Code3 defines the digital filter for Flow, selects the calculation of flow direction and temperature, defines the function for Input1 and holds the P-NET node address for the Flow Transmitter.

The data type for Code3 is a LongInteger, which may be considered as 8 digits in hexadecimal readout. The first 6 digits represent and selects one of the above mentioned options. Digit 7 and 8 are not used and should be set to 0. The information must be interpreted as shown below (only digits 1 to 6 are applicable to the PD 210 display unit):

Va l.	Dig. 1	Dig. 2	Dig. 3	Dig. 4	Dig. 5	Dig. 6	7	8
Va l.	Flow unit Time const.	Calculation of Flow	Calculation of Temp.	Input1 function	P-NET node address
0	Unit/min Time = 0.15 s	Unidirectional flow<0.2% =0			Two digit number: 01..7D		0	0
1	Unit/hour Time = 0.15 s
2	Unit/min Time = 1.0 s	Unidirectional	Unit = °C	Stop counters => no error
3	Unit/hour Time = 1.0 s		Unit = °F	Stop counters => error = 05
4	Unit/min Time = 5.0 s	Bidirectional flow<0.2% =0		Clear Volume2 Start Batch
5	Unit/hour Time = 5.0 s
6	Unit/min Time = 10.0 s	Bidirectional
7	Unit/hour Time = 10.0 s

The positive flow direction is indicated by an arrow on the meterhead. When measuring in two directions, flow in the direction of the arrow is registered as positive flow, and flow in the opposite direction of the arrow is registered as negative flow. When set to measure in one direction only, flow in the opposite direction of the arrow is ignored.

The P-NET node address is a two-digit number in the range from 01 to 7D in hexadecimal readout, where digit 5 is the most significant digit. When using the PD 210 display unit, only the digits from 0 to 9 can be used.

See also the Batch control application example for a specific configuration of the Code3 register.

6.2 Standard settings

If specific functions are not requested at time of order, the transmitter will be delivered with the following standard settings (not valid for PD 367, 3-phase extension):

Variable name PD 210 addr.	C 25	C 38	C 51	C 63	C 76
MeterSize E1	8.0	20.0	40.0	80.0	120.0
Scale Standard E5 Extended	.000010 8.00000	.000010 20.0000	.000100 40.0000	.000100 80.0000	.000100 120.000
Code1 E6	33333300	33333300	22222200	22222200	22222200
Code2 Standard E7 Extended	41110000 21110000	41110000 21110000	41110000 21110000	41110000 21110000	41110000 21110000
Code3 E8	30241100	30241100	30241100	30241100	30241100

NOTE: only digits 1 to 6 are applicable to the PD 210 display unit.

These standard settings result in the following output configurations:

Standard version:

Output2: 1 litre/pulse (C 25 and C 38)

10 litre/pulse (C 51, C 63 and C 76)

Output3: 0.01 litre/pulse (C 25 and C 38)

0.1 litre/pulse (C51, C63 and C 76)

Extended version:

Output2: 1 litre/pulse (C 25 and C 38)

10 litre/pulse (C 51, C 63 and C 76)

Output3: 20 mA at max flow rate

7 Applications

7.1 Flow Control

A centrifugal pump, a PD 340 Flow Transmitter, and a modulating valve with an I/P converter will form an accurate FLOW CONTROL SYSTEM. Such a system is more accurate, and normally also less expensive than systems using a positive pump with variable speed.

The PD 340 Flow Transmitter has a built-in PI-REGULATOR, which can be operated in AUTO as well as in MANUAL. Input1 is used for this manual/auto selection.

The requested flow rate is keyed into SETPOINT on the connected PD 210 display. The output value can be read in % by pressing the untitled key to the left of VOL.2. If the regulator is in MANUAL, the operator can key the requested output position into the same register.

Programming

To enable the PI REGULATOR function in the PD 340, the Flow Transmitter should be programmed in the following way: The * indicates that these digits are not in use for this function but should be programmed according to the meter size and other working conditions of the Flow Transmitter. The program enable switch must be in position ON during programming.

E1: ****** E5: P-band

E2: --Ti-- E6: ******

E3: 0000AB E7: 18**0*

E4: ****** E8: ******

The P-band indicates the proportional sensitivity in the same flow units as the "FLOW" register (l/h or gallons/min.). The P-band is equal to the change in flow rate, which will change the output from 0 to 100%. A typical setting of E5 is 25% of max. flow.

The Ti is the regulators integration time in seconds. Ti is equal to the time the integrating part of the regulator requires to provide the same change on the output as the proportional part for a step in flow rate. A typical Ti time is 2 sec. The P-band and the Ti can be optimized the experimental way, or by following the rules from the specialized literature.

There are two types of valves. The digit A is set equal to 0 if the valve is normally closed at 4 mA, or set equal to 2 if the valve is normally open at 4 mA.

Digit B in E3 determines the function of the AUTO/MAN. B = 0: The regulator is always in auto. B = 2: If Input1 is on, the regulator is in MANUAL, otherwise in AUTO.

The P-band, Ti and Setpoint can always be changed because these registers are stored in RAM. The contents will disappear after a power-cut, unless the programme enable switch is in position ON. In this case the contents of P-band, Ti and SETPOINT are stored in EEPROM, and restored in RAM after power-up. The program enable switch must be switched off after the programming to preserve the EEPROM memory.

Electrical connections.

It is very important to select the correct valve size. Which size to choose depends on the following information: The min. and max. flow rate, the flow/pressure curves of the pump, and the pressure drop in the pipe work at the specified flow rate. It is normally recommend to let the supplier of the modulating valve select the size.

7.2 Batch control using the PD 210 display

The PD 340 Flow Transmitter has a built-in batch control function, and can therefore easily be used to control the dosing of a specified volume. The requested volume is keyed into "SETPOINT" on the PD 210. Input1 on PD 340 is used to start the batch control. Output2 controls the dosing valve or pump. The Vol 2 counter shows the dosed volume. When the batch control function is used, the built-in flow regulator cannot be used.

The function of the system.

At first the requested volume is keyed into "SETPOINT". The dosing will start when Input1 is activated. This will clear the volume 2 counter and Output2 goes on. The valve or pump controlling the flow must be activated by the relay. When the liquid starts to flow, "Vol 2" will count up and when it is equal to the setpoint, Output2 will switch off. Because of the reaction time of the valve or pump, the flow will not stop immediately after Output2 is switched off. Consequently the actual dosed volume is a little higher than the setpoint. This after-flow is fairly constant if the reaction time and the flow rate are constant, and therefore it is possible to compensate for that by reducing the setpoint with the volume of the after-flow. The volume of this after-flow can be calculated as [volume 2 - setpoint].

Programming the batch control.

To obtain the requested functions the PD 340 must be programmed as shown below. When programming the Flow Transmitter the Program Enable Switch on the terminal board must be in position ON. Digits marked with * are not used for the batch control function, but should be programmed according to meter size and other working conditions.

E1: ****** E5: ******

E2: ****** E6: ******

E3: 000000 E7: **2106

E4: ****** E8: 3024**

When programming is done, the Program Enable Switch should be put back to position OFF. The value in setpoint register before the program enable switch was switched off will be used as a power-up value after a power-cut.

Electrical connections.

8 Fault finding

8.1 Error detection

The PD 340 Flow Transmitter is equipped with a comprehensive self testing system which is able to indicate faults arising from improper use of the transmitter, or faults arising whilst the transmitter is in use.

When the internal test system registers a fault, an error code, in the form of a number, is generated within the Flow Transmitter. If several errors in the error checking system should develop at the same time, only the highest numbered error is saved.

The error may be observed in different ways.

PD 210 display unit:

PD 4000 Flowmeter-Display:

If an error occurs, the error will be recorded and shown in the display in clear text. Only errors from the Flow Transmitter currently shown in the display, will appear. E.G. if an error occurs in a transmitter, which is not currently displayed, the error text will not be displayed until the transmitter is selected.

P-NET:

If an error occurs, any reply from the Flow Transmitter will be equipped with an error indication as long as an error code is present. The error code is cleared by reading the Error3 register.

8.2 Typical errors

8.2.1 Flow Transmitter with PD 210 display unit

If neither the transmitter nor the display unit functions:

· Check that the light‑emitting diode in the terminal box is on.

· Check that the transmitter is correctly connected.

· Check that the supply voltage at the Flow Transmitter is at least 20 V AC or DC, when the transmitter is powered up (with the terminal box mounted on the transmitter).

If the display unit does not function:

· Check that the cable between the transmitter and the display unit is correctly connected at both ends.

· Check that the cable is not defective.

· Check that the cable is not too long or too thin (max. 100 m, min. 0,75 mm).

If external equipment, e.g. an electronic counter, does not function, or does not function properly:

· Check that the equipment is correctly connected.

· Check that the transmitter data is being displayed correctly (eg. using PD 210).

· Check that the required functions for the output signals have been correctly set, and that the meter size is correct (e.g. using PD 210).

If the transmitter does not indicate flow:

· Check that there really is flow through the metering pipe.

· Check that the flow direction is correct.

If the transmitter gives a false read‑out:

· Check if there is any air in the liquid.

· Check that the conductivity of the liquid lies within the specified range.

8.2.2 Flow Transmitter without display unit

If the transmitter does not function:

· Check that the light‑emitting diode in the terminal box is on.

· Check that the transmitter is correctly connected.

· Check that the supply voltage at the transmitter is at least 20 V AC or DC, when the transmitter is powered up (with the terminal box mounted on the transmitter).

· Check that there really is flow through the metering pipe.

· Check that the flow direction is correct.

If the transmitter gives a false read‑out:

· Check if there is any air in the liquid.

· Check that the conductivity of the liquid lies within the specified range.

9 List of spare parts

The following spare parts are available for PD 340.

Meterhead without electronic module and terminal box:

· PD 340 C 25.

· PD 340 C 38.

· PD 340 C 51.

· PD 340 C 63.

· PD 340 C 76.

Electronic module complete:

· Standard version, 2-pulse output.

· Extended version, 1 current output, 1 pulse output, P-NET interface.

· Extended version, 3-phase pulse output, P-NET interface.

Electronic module, extension to standard version:

· PD 366, 1 current output, 1 pulse output, P-NET interface.

· PD 367, 3-phase pulse output, P-NET interface.

Terminal box.

The Terminal Box contains clearly marked terminals for all in and outputs. The box is equipped with 3 cable glands, PG 11.

Clamp set for:

· C 25

· C 38

· C 51

· C 63

· C 76

The clamp set consists of:

· 2 pcs clamp rings (AISI 304)

· 2 pcs clamp liners (AISI 316)

· 2 pcs gaskets for above (NBR, Nitrile Rubber).

9.1 Dimensions and capacities

Figure 5: Dimensions

Dimensions and capacities.

Meter size	Nom. Size D in mm	Capacit m³/h	Weight in Kg
C 25	25	8	5
C 38	38	20	5
C 51	51	40	5
C 63	63.5	80	5
C 76	76	120	5

9.2 Material

Electrodes: Stainless steel AISI 316.

Metering pipe: Stainless steel AISI 316.

Coating inside metering pipe:FEP Teflon

Housing: PPO Noryle.

9.3 Connections

Clamp pipe coupling DS/ISO 2852.

10 Specifications

All electrical characteristics are valid at an ambient temperature -10 °C to +50 °C, unless otherwise stated.

All specifications are respected in the approved EMI conditions. EMC test specifications for PD 340 are available in a separate document, PD no. 506 023.

10.1 Flow measurement

Figure 6: Max. error against actual flow rate

Flow measurement error: typ. less than half the value as shown on Figure 6

Current output error: As Figure 6, plus +/‑0.3% of current output range

Linearity: (see Figure 6)

Repeatability: max (0.5 × error), (see Figure 6)

Ambient temperature effect: max 0.04%/10 °C

Voltage supply effect: max 0.01%/10%

Response time pulse output: 0.2 sec.

Response time current output: 1.0 sec.

Max. flow rate:

C 25	C 38	C 51	C 63	C 76
8 m³/h	20 m³/h	40 m³/h	80 m³/h	120 m³/h

NOTE:The max. flow rate for the Flow Transmitter must NEVER be exceeded. Otherwise the meterhead may be damaged.

10.2 Power Supply

The transmitter should always have the supply connected to prevent condensation in the electronics.

Power supply AC (50/60 Hz) or DC: nom. 24.0 V

min. 20.0 V

max. 28.0 V

Current at power up : max. 350 mA

Fuse (time lag) 0.8 A

Power consumption: max. 6 W

10.3 Liquid

Conductivity: min 5 μs/cm.

Temperature range: ‑30 °C to +100 °C

Pressure: max. 10 bar

Pressure test: max. 15 bar

10.4 Measurement of temperature

Temperature input with Pt-100 sensor (IEC 751, DIN 43760). Specifications exclude the accuracy of the Pt-100 sensor.

Range: ‑30 °C to +100 °C

Error: max +/‑0.9 °C

10.5 Environment

Ambient temperature: ‑10 °C to +50 °C

Protection: IP 67

10.6 Approvals

Compliance with EMC-directive no.: 89/336/ECC

Generic standards for emission:

Residential, commercial and light industry EN 50081-1

Industry PrEN 50081-2

Generic standards for immunity:

Residential, commercial and light industry EN 50082-1

Industry PrEN 50082-2

Vibration (sinusoidal): IEC 68-2-6 Test Fc

11 Appendix

11.1 3-phased output signals

The PD 340 Flow Transmitter may be equipped with the PD 367 extension board with P‑NET interface and 3-phased output signals. The PD 367 extension board is mainly used to simulate a mechanical flowmeter.

The PD 367 phase card may be used in three different modes:

1. Three-phase counter: Indication of the flow rate with 3 phased pulse signals. The phase sequence indicates the flow direction and the pulse frequency indicates the flow rate. An error in the Flow Transmitter will open all 3 output signals (high-impedance state). See the signal diagram below.

2. Two-phase counter with separate error signal: Indication of the flow rate with 2 phased pulse signals. The error signal is closed during error-free measurement. The phase sequence indicates the flow direction and the pulse frequency indicates the flow rate. An error in the Flow Transmitter will open all 3 output signals (high-impedance state). See the signal diagram below.

3. Counter with up/down signal and error signal: Indication of the flow rate with 1 pulse signal. The error signal is closed during error-free measurement. The flow direction is indicated by the up/down signal and the pulse frequency indicates the flow rate. An error in the Flow Transmitter will open all 3 output signals (high-impedance state).

When used for 3-phase output, the output signals and the matching options can NOT be configured or used as described.

Output2 is used for phase 1, Output3 is used for phase 2 and 3 (current output and digital output, respectively).

The operation mode is selected by means of a jumper. The options and jumper settings are shown on the following page.

	Mode 1 simple	Mode 2 2-phase	Mode 3 3-phase	Terminal no.
Jumper pos.	1	2	3
Signal 1	Phase 1	Error	Phase 1	3
Signal 2	Up/down	Phase 1	Phase 2	16
Signal 3	Error	Phase 2	Phase 3	18

The configuration for the Flow Transmitter should be the following when utilising the PD 367 phase card (this configuration is the same for all sizes of the Flow Transmitter):

The Scale variable (PD 210 display key E5) must be set to 0.016667

The Code2 variable (PD 210 display key E7) must be set to 41810000

The Code3 variable (PD 210 display key E8) must be set to 3024**00

The * indicates that these digits should be configured according to the actual application and working conditions for the Flow Transmitter.

Figure 7: Timing diagram for Phased output signals

12 Appendix 2

12.1 Memory types

The PD 340 stores data in different types of memory depending on the value of a control variable following a reset or a power failure, and the state of write protection.

Some variables are stored in both non-volatile memory and in volatile memory. The state of the module's Program enable switch determines whether the contents are changed in both types of memory or only in the volatile type.

The following memory types are listed in the channel definition tables.

Read Only

PROM ReadOnly

The PROM is always write protected and can never be changed.

RAM ReadOnly

The variable is stored in RAM and is only accessible for Reading.

Read Protected Write

EEPROM RPW (Read, Protected Write)

By setting the ProgramEnable switch to ON, the contents of the EEPROM can be changed. The contents of the EEPROM will remain unchanged during and after a power failure.

Read Write

RAM ReadWrite

The variable can be changed instantly. After reset or a power failure, it's value is set to zero.

Read Write, Protected BackUp Write

RAM InitEEPROM

The variable is stored in both RAM and EEPROM. After a reset, the variable is copied from EEPROM into RAM. When the variable is changed, the value is changed in RAM. If the ProgramEnable switch is ON, the value is changed in both RAM and EEPROM when the variable is changed.

13 Appendix 3

Figure 8: Software diagram