Siemens SITRANS P DS III Operating Instructions Manual page 180

Commissioning
10.4 Differential pressure and flow rate
Hot vapor
Danger of injury.
You can briefly open the drain valves
process.
• Only open the drain valves
Note
Incorrect measurement results
The measurement result is only free of errors if the differential pressure lines
equally high condensate columns with the same temperature. The zero calibration must be
repeated, if required, if these conditions are fulfilled.
To commission the pressure transmitter for vapor, proceed as follows:
1. Open both the shut-off valves
2. Open the stabilizing valve
3. Wait till the vapor in the differential pressure lines
condenses.
4. Open the differential pressure valve
pressure transmitter
5. Close the vent valve.
6. Open the vent valve on the negative side of the pressure transmitter
condensate escapes without bubbles.
7. Close the differential pressure valve
8. Open the differential pressure valve
close it.
9. Close the vent valve on the negative side
10.Open the differential pressure valve
11.Check and if required correct the zero point when the start of scale value is 0 kPa.
12.Close the stabilizing valve
13.Open the differential pressure valve
14.You can briefly open the blow-out valves
to leak.
180
WARNING
①
slightly, until condensate escapes without bubbles.
⑦
to clean the line. Hot vapor can escape in the
⑦
briefly, and close them again before vapor escapes.
⑥
at the pressure tapping point.
②
.
③
and the vent valve on the positive side of the
③
.
④
till the air-free condensate goes out and then
①
.
③
by rotating it in half a turn.
②
.
③ ④
and completely.
⑦
to clean the line. Close before steam starts
⑤
and in the condensate pots
①
slightly, until
SITRANS P DS III/P410 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00053276-08
④
have
⑧