Wika 892.34.1998 Bedienungsanleitung PDF herunterladen (Seite 11)

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Betriebsanleitung fü r Druckmessgerä te mit FerngeberOperating Instructions for Pressure Transmitters

Table of contents

page

1 Operating principle 14

2 Installation instructions 15

3 Mounting and operation 16

4 Arrangements for pressure measurement 16

5 Wiring details 17

class version 17

7 Technical data 18

8 Service and maintenance 19

9 Special features for differential pressure transmitters

with mounted valve manifold 20

10 Storage 21

11 Trouble shooting 21

Measures to be taken by customer for returns and repairs

13 Disposal/end of service life 22

Enclosure 1: EC-type examination certificate Model 892.34 23-24

Operating principle

Pressure transmitters for differential pressure mainly consist of the functional groups:

• mechanical measuring system with an elastic pressure element

• Hall-effect sensor with amplifier

• cover with the electronical connections

Under the influence of pressure the elastic zone of the measuring element is deformed

and this movement is used to alter a magnetic field.

This chain is converted without contact by a magnetic field-dependent sensor (hall-sensor)

via an amplifier into an electric output signal. This output signal is set at the factory as

measuring range (for example 4 ... 20 mA) and corresponds with the measurement span

on the respective pressure range.

The standard 4 ... 20 mA current signals in 2-wire system or 0 ... 20 mA in 3-wire system

are generated by the integrated amplifier.

The intrinsically safe version, Model 892.34, has to be used in explosion hazardous

areas.

The EC-Type Examination Certificate of the DMT (Deutsche Montan Technologie GmbH)

for intrinsically safe instruments in ignition protection Class

II 2G EEx ia IIC T6 and

I M2 EEx ia I is provided for Model 892.34. Due to the standard 4 ... 20 mA output signal

these gauges can be used in all industries.

1 2 ... 6 7 8 9 10 11 12

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Wika 892.34.1998 Bedienungsanleitung Seite 11