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502 010 05
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 with a square measurement chamber, which prevents
changes in flow profile affecting meter accuracy (see the following sections, Operating prin-
ciples, and Reducing the influence of varying flow profiles, for details). 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 accu-
racy. The calibration of the meterhead is carried out during manufacture using a computer
controlled calibration facility.
The Electronic Module is available in two versions, standard and extended with current out-
put or 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, one of the outputs can be configured either for pulse output or ana-
logue current output, 4-20 mA.
The extended version can also be configured for 3-phase output. In this mode the normal
separate pulse output signals are transformed to a combined 3-phased output signal.
The extended version has a built-in P-NET Fieldbus interface (IEC 61158 Type 4), which can
be used for configuration, or 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.
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Flow Transmitter, PD 340
Manual
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