Siemens SIPROCESS GA700 Operating Instructions Manual page 163

Note
Shutting off the sample gas inlet and outlet
If you shut off the sample gas inlet and outlet, make sure that the reference gas can escape,
for example, by a 2-way valve at the sample gas outlet.
Do not switch off the reference gas! Aggressive sample gases can destroy the microflow
sensor.
The following graphic shows a standard assignment of the gas connections on the field module.
Other types of connection or assignments are possible depending on the order.
The inlets and outlets of the sample and reference gases are factory-fitted with a flame arrester
in this standard assignment.
Arrangement of the gas connections
①
②
③
④
⑤
⑥
⑦
Figure 6-1
The sample gas connections are made of stainless steel, material no. 1.4571 or Hastelloy,
material no. 2.4819. The reference gas connection is made of stainless steel, mat. no. 1.4571.
The gas connections have a clamping ring screw connection for 6 mm pipes.
Field device
Operating Instructions, 05/2015, A5E35640463-02
Sample gas inlet
Sample gas outlet
Blanking plug or purging gas connection
Reference gas inlet
Breathing device (pressure compensation
coupling)
Cable gland
Ground connection
Gas connection for field module
Wiring
6.3 Field module
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