To commission the pressure transmitter for liquids, proceed as follows:
1. Open both the shut-off valves ⑥ at the pressure tapping point.
2. Open the stabilizing valve ②.
3. With pressure transmitters below the differential pressure transducer, partially open both
drain valves ⑦ one after the other until liquid emerges without bubbles.
In the case of a pressure transmitter above the differential pressure transducer, partially
open both vent valves ⑩ one after the other until liquid emerges without bubbles.
4. Close both drain valves ⑦ or vent valves ⑩.
5. Partially open the differential pressure valve ③ and the vent valve (sealing plug with vent
valve) on the positive side of the pressure transmitter until liquid escapes without bubbles.
6. Close the vent valve (sealing plug with vent valve).
7. Partially open the vent valve (sealing plug with vent valve) on the negative side of the
pressure transmitter until liquid escapes without bubbles.
8. Close the differential pressure valve ③.
9. Partially open the differential pressure valve ④ until liquid escapes without bubbles.
10.Close the differential pressure valve.
11.Close the vent valve (sealing plug with vent valve) on the negative side of the pressure
transmitter.
12.Open the differential pressure valve ③ with half a revolution.
13.For a lower range value of 0 bar, check the zero point (4 mA) and correct the lower range
value if it is different.
14.Close the stabilizing valve ②.
15.Open the differential pressure valves (③ and ④) completely.
6.5.3 Commissioning with vapor
Requirement
All valves are closed.
WARNING
Hot vapor
Danger of injury or damage to device.
If the shut-off valves ⑥ and the differential pressure valve ③ are both open and the stabilizing
valve ② is then opened, the pressure transmitter ① can be damaged by the flow of vapor.
● Follow the specified procedure for commissioning.
Commissioning
6.5 Differential pressure and flow rate
SITRANS P320/P420 with 4 to 20 mA/HART
Compact Operating Instructions, 09/2018, A5E38874562-AB 51
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