
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.
9. Close the vent valve on the negative side ①.
10.Open the differential pressure valve ③ by rotating it in half a turn.
11.Check and if required correct the zero point in case of start of scale value 0 bar (4 mA).
12.Close the stabilizing valve ②.
13.Fully open the differential pressure valves ③ and ④.
14.You can briefly open the drain valves ⑦ to clean the line. Close before steam starts to leak.
Commissioning
9.4 Differential pressure and flow rate
SITRANS P, DS III series with HART
158 Operating Instructions, 09/2012, A5E00047092-08
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