
Procedure
WARNING
The transmitter should not be depressurized if toxic substances are being used.
To commission the transmitter with liquids, proceed as follows:
1.
Open both the shut-off valves ⑥ at the pressure tapping point.
2. Open the equalizer valve ②.
3. With transmitters below the differential pressure transducer, open both the blowout valves
one after the other ⑦ until the air-free liquid emerges.
In the case of a transmitter above the differential pressure transducer, open both the vent
valves one after the other ⑩ until the liquid emerges.
4. Close both drain valves ⑦ or vent valves ⑩.
5. Open the differential pressure valve ③ and the vent valve on the positive side of the
transmitter ① slightly, until fluid escapes without bubbles.
6. Close the vent valve.
7. Open the vent valve on the negative side of the transmitter ① slightly, until fluid escapes
without bubbles.
8. Close the differential pressure valve ③.
9. Open the differential pressure valve ④ until the liquid emerges and then close it.
10.Close the vent valve on the negative side of the transmitter ①.
11.Open the differential pressure valve ③ by rotating it in half a turn.
12.Check and if required adjust the zero point (4 mA) if the start-of-scale value is 0 bar.
13.Close the equalizer valve ②.
14.Open the differential pressure valves (③ and ④) completely.
Commissioning
9.4 Differential pressure and flow rate
SITRANS P, DS III series with HART
156 Operating Instructions, 09/2012, A5E00047092-08
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