Procedure
Example: Measuring gases above the
pressure tapping point
Example: Measuring gases below the
pressure tapping point
① Pressure transmitter ⑤ Pressure line
② Shut-off valve ⑥ Shut-off valve
③ Shut-off valve to process ⑦ Shut-off valve (optional)
④ Shut-off valve for test connection
or for bleed screw
⑧ Condensate vessel (optional)
⑨ Blowout valve
To commission the pressure transmitter for gases, 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
46 Compact Operating Instructions, 09/2018, A5E38874562-AB
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