SITRANS P DS III/P410 (7MF4.33.. 7MF4.34.. 7MF4.35..)
30
A5E03434626-04, 05/2015
Procedure
DANGER
Toxic liquids
Danger of poisoning when the device is vented.
If toxic process media are measured with this device, toxic liquids can escape when the device is vented.
•
Before venting, make sure there is no liquid in the device or take the necessary safety precautions.
To commission the pressure transmitter for liquids, proceed as follows:
1.
Open both the shut-off valves
⑥
at the pressure tapping point.
2.
Open the stabilizing valve
②
.
3.
With a pressure transmitter below the differential pressure transducer, open both blowout valves
⑦
one after the other
until the air-free liquid escapes.
In the case of a pressure transmitter above the differential pressure transducer, open both vent valves
⑩
one after the
other until the air-free liquid escapes.
4.
Close both drain valves
⑦
or vent valves
⑩
.
5.
Open the differential pressure valve
③
and the vent valve on the positive side of the pressure transmitter
①
slightly,
until fluid escapes without bubbles.
6.
Close the vent valve.
7.
Open the vent valve on the negative side of the pressure transmitter
①
slightly, until fluid escapes without bubbles.
8.
Close the differential pressure valve
③
.
9.
Open the differential pressure valve
④
until the liquid emerges and then close it.
10.
Close the vent valve on the negative side of the pressure transmitter
①
.
11.
Open the differential pressure valve
③
by rotating it in ½ turn.
12.
Check and, if necessary, correct the zero point (4 mA) when the start-of-scale value is 0 kPa.
13.
Close the stabilizing valve
②
.
14.
Open the differential pressure valves (
③
and
④
) completely.