Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART Commissioning
Endress+Hauser 75
6.9 Differential pressure measurement (Deltabar M)
6.9.1 Preparatory steps
!
Note!
• Before calibrating the device, the impulse piping must be cleaned and filled with fluid. See the
following table.
Valves Meaning Preferred installation
1Close 3.
P01-PMD55xxx-11-xx-xx-xx-013
Above: preferred installation for gases
Below: preferred installation for liquids
IDeltabar M
II Three-valve manifold
III Separator
1, 5 Drain valves
2, 4 Inlet valves
3 Equalising valve
6, 7 Vent valves on Deltabar M
A, B Shut-off valve
2 Fill measuring system with fluid.
Open A, B, 2, 4. Fluid flows in.
3 Clean impulse piping if necessary:
1
– by blowing out with compressed air in the case of gases
– by rinsing out in the case of liquids.
1) for arrangement with 5 valves
Close 2 and 4. Block off device.
Open 1 and 5.
Blow out/rinse out impulse
piping.
Close 1 and 5.
Close valves after cleaning.
4Vent device.
Open 2 and 4. Introduce fluid.
Close 4. Close low-pressure side.
Open 3. Balance positive and low-
pressure side.
Open 6 and 7 briefly, then
close them again.
Fill device completely with
fluid and remove air.
5 Set measuring point in operation.
Close 3. Shut off high-pressure side
from low-pressure side.
Open 4. Connect low-pressure side.
Now
–1
, 3, 5
, 6 and 7 are closed.
– 2 and 4 are open.
– A and B open (if present).
6 Carry out calibration if necessary. See also page 76,
section 6.6.2.
I
II
+–
–
P2
+
P1
6
7
–
P2
+
P1
6
7
3
24
AB
A
B
+
1
5
24
3
II
I
IIIIII
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