PD 340 Flow Transmitter
PD 340 flow transmitter is a precision meter for the volumetric measurement of
liquids which are electrically conducting. The
transmitter can be used in applications where a hygienic design is required.
The rugged construction of the transmitter makes it suitable for installations
PD 340 flow transmitter consists of three parts: meter head, electronic
module, and terminal box. The electronic module and the terminal box are the
same for all sizes of transmitters.
Meter head consists
of a stainless metering pipe with clamp liners. Two magnet coils are mounted
external to the metering pipe. Inside the metering pipe two stainless
electrodes are mounted. 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
effect on meter accuracy. The calibration of the meter head is carried out
using a computer controlled calibration facility.
Electronic Module is
micro-processor based and both controls the sequence of measurement and output
Terminal Box is
completely separated from the electronic module. Hence connections can be
changed without disruption to the electronics. All terminals in the terminal
base are clearly marked with both number and
The meterhead consists of a metering pipe with 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 average velocity of flow and therefore to the volume flowing. The micro-processor in the transmitter controls the current generator keeping the magnetic field constant. The voltage of the electrodes is taken via an amplifier and signal converter to the micro-processor which calculates the liquid flow.
measurement:- Less than ±0.3%of max.
current output: Cf. fig. 3, plus ±0.3% of range
for current output.
See fig. 3.
Repeatability: Better than 0.5 x
see fig. 3.
temperature effect: Less
Less than 0.01%/10%.
0.2 sec. on pulse output, 1 sec on current output.
Max. capacity: PD 340 – C 25: 8 m 3 /h.
C 38: 20 m 3 /h.
C 51: 40 m 3 /h.
C 63: 80 m 3 /h.
C 76: 120 m 3 /h.
Measurement of temperature:
Deviation: Less than ±0.9°C
with Pt-100 detector
From – 30°C to +100°C.
From -10°C to + 50°C.
Power supply: 24 V AC ± 15%, 50/60 c/s or 24 V DC ± 15%.
Max. 6 W.
Conductivity: Min. 5mS/cm.
Pressure: Max. 10 bar.
Outputs: The transmitter can give two different output signals, pulse signal or current signal
Pulse signals: max 40V, 100mA
Current signal: 10 - 30 V
Material: Electrodes: Stainless steel AISI 316.
Metering pipe: Stainless steel AISI 316.
Coating inside metering pipe: FEP Teflon
Housing: PPO Noryle
Connections: Clamp pipe coupling DS/ISO 2852.
Approvals. Compliance with EMC-directive no.: 89/336/ECC
Generic standards for emission: Residential, commercial and light industry EN 50081-1
Industry EN 50081-2
Generic standards for immunity: Residential, commercial and light industry EN 50082-1
Industry EN 50082-2
Vibration (sinusoidal): IEC 68-2-6 Test Fc
The transmitter should be located in the
piping system so that the metering pipe is always filled with liquid as the
transmitter can register flow even if the metering pipe
To create the best conditions for precise metering a straight run of at least
3x D should be mounted up- stream
transmitter has three outputs, OUTPUT 1, 2, and 3. OUTPUT 1 is a power supply
output, which can be used for power supply of external counter circuit. The
voltage of the output can vary from 20 to 32 V DC.
can be selected for one of three functions:
can be selected for one of two functions:
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