
Commissioning
8.3 Differential pressure and flow rate
SITRANS P500 with HART
182
Operating Instructions, 12/2014, A5E02344528-09
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.
Summary of Contents for SITRANS P500
Page 1: ......
Page 2: ......
Page 10: ...Table of contents SITRANS P500 with HART 10 Operating Instructions 12 2014 A5E02344528 09 ...
Page 238: ......