54
7 Set up measuring system
WIKA Operating Instructions - Differential pressure transmitter DPT-20
+
A
B
6
7
3
2
4
1
5
II
I
–
+
III
III
IV
Fig. 41: Preferred measurement setup for closed vessels with steam overlay
I DPT-20
II 3-fold valve block
III Precipitator
IV Condensate vessel
1, 5 Drain valves
2, 4 Inlet valves
3 Breather valve
6, 7 Vent valves on DPT-20
A, B Blocking valves
Proceed as follows:
1. Fill the vessel to just above the lower tap
2. Fill measuring system with medium
Open valve A and B: Open block valves
Fill the low pressure effective pressure line on the height of the
condensation pot
3. Remove air from instrument:
Open valve 2 and 4: Discharge medium
Open valve 3: Equalisation high and low pressure side
Briefly open valve 6 and 7, then close again: Fill the measuring
instrument completely with the medium and remove air
4. Put measurement loop into operation:
Close valve 3: Separate high and low pressure side
Open valve 4: Connect low pressure side
Now:
Valve 3, 6 and 7 are closed
Valves 2, 4, A and B are open.
Closed vessel with steam
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