SITRANS P, DS III series (7MF4.33.. 7MF4.34.. 7MF4.35..)
30 A5E03434656-02, 12/2012
5.4.4 Commissioning with vapor
① Pressure transmitter ⑦ Drain valves
② Stabilizing valve ⑧ Condensate pots
③, ④ Differential pressure valves ⑨ Differential pressure transducer/Orifice plate
⑤ Differential pressure lines ⑩ Insulation
⑥ Shut-off valves
Figure 5-2 Measuring steam
Condition
All valves are closed.
Procedure
NOTICE
The measuring result is error-free only if the differential pressure lines ⑤ have equally high condensate columns with the
same temperature. The zero calibration must be repeated if required if these conditions are fulfilled. If the shut-off valves
⑥ and the differential pressure valves ③ are open at the same time and the stabilizing valve ② is opened, there is a
possibility of the transmitter
① being damaged due to the streaming vapor.
To commission the transmitter for vapor, proceed as follows:
1. Open both the shut-off valves
⑥ at the pressure tapping point.
2. Open the stabilizing valve
②.
3. Wait until the steam in the differential pressure lines
⑤ and in the equalizing vessels ⑧ has condensed.
4. Open the differential pressure valve
③ and the vent valve on the positive side of the transmitter ① slightly, until
condensate escapes without bubbles.
5. Close the vent valve.
6. Open the vent valve on the negative side of the transmitter
① slightly, until condensate escapes without bubbles.
7. Close the differential pressure valve
③.
8. Open the differential pressure valve
④ slightly, until condensate escapes without bubbles, then close it.
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