5. Open the shut-off valve ⑥ at the pressure tapping point.
6. Open the shut-off valve for the process ③.
6.4.2 Commissioning with steam or liquid
Requirement
All valves are closed.
Procedure
① Pressure transmitter
② Shut-off valve
③ Shut-off valve to process
④ Shut-off valve for test connection or for bleed screw
⑤ Pressure line
⑥ Shut-off valve
⑦ Drain valve
⑧ Compensation vessel (steam only)
To commission the pressure transmitter for steam or liquid, proceed as follows:
1. Open the shut-off valve for the test connection ④.
2. Via the test connection of the shut-off valve ②, apply the pressure corresponding to the
start of scale value to the pressure transmitter.
3. Ensure that the lower range value corresponds to the desired value. Otherwise, correct the
value.
4. Close the shut-off valve for the test connection ④.
Commissioning
6.4 gauge pressure, absolute pressure from the differential pressure series and absolute pressure from the gauge
pressure series
SITRANS P320/P420 with 4 to 20 mA/HART
Compact Operating Instructions, 09/2018, A5E38874562-AB 47
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