Siemens SITRANS DS III Series Compact Operating Instructions page 31

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
2. Open the equalizer valve
3. With transmitters below the differential pressure transducer, open both the blowout valves one after the other
air-free liquid emerges.
In the case of a transmitter above the differential pressure transducer, open both the vent valves one after the other
until the liquid emerges.
4. Close both drain valves
5. Open the differential pressure valve
escapes without bubbles.
6. Close the vent valve.
7. Open the vent valve on the negative side of the transmitter
8. Close the differential pressure valve
9. Open the differential pressure valve
10. Close the vent valve on the negative side of the transmitter
11. Open the differential pressure valve
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
14. Open the differential pressure valves (
SITRANS P, DS III series (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434656-02, 12/2012
⑥
at the pressure tapping point.
②
.
⑦ ⑩
or vent valves .
③
and the vent valve on the positive side of the transmitter
③
.
④
until the liquid emerges and then close it.
③
by rotating it in half a turn.
②
.
③ ④
and
①
slightly, until fluid escapes without bubbles.
①
.
) completely.
⑦
until the
⑩
①
slightly, until fluid
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