3. Open the differential pressure valve (③ or ④).
4. Check and, if necessary, correct the zero point when the start-of-scale value is 0 bar (4 mA).
5. Close the stabilizing valve ②.
6. Open the other differential pressure valve (③ or ④).
8.5.2.2 Commissioning with liquids
Requirement
All valves are closed.
DANGER
Toxic liquids
Danger of poisoning when the device is vented.
If toxic process media are measured with this device, toxic liquids can escape when the device
is vented.
● Before venting, make sure there is no liquid in the device or take the necessary safety
precautions.
Procedure
Pressure transmitter below thedifferential
pressure transducer
Pressure transmitter above the differential pressure
transducer
① Pressure transmitter ⑦ Drain valves
Commissioning
8.5 Application examples
SITRANS P320/P420 (mA/HART)
92 Operating Instructions, 06/2018, A5E44852162-AA
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