SITRANS P, DS III series (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434656-02, 12/2012
29
Condition
All valves are closed.
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.
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