Siemens SITRANS P Betriebsanleitung Seite 158

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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 at the pressure tapping point.
2. Open the equalizer valve .
3. With transmitters below the differential pressure transducer, open both the blowout valves
one after the other 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 until the liquid emerges.
4. Close both drain valves or vent valves .
5. Open the differential pressure valve and the vent valve on the positive side of the
transmitter slightly, until fluid escapes without bubbles.
6. Close the vent valve.
7. Open the vent valve on the negative side of the transmitter slightly, until fluid escapes
without bubbles.
8. Close the differential pressure valve .
9. Open the differential pressure valve until the liquid emerges and then close it.
10.Close the vent valve on the negative side of the transmitter .
11.Open the differential pressure valve 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 .
14.Open the differential pressure valves ( and ) 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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