SITRANS P310 with HART
A5E35075329-01, 05/2015
29
Danger of injury or damage to device.
If the shut-off valves
⑥ and the differential pressure valve ③ are both open and the stabilizing valve ② is then opened,
the pressure transmitter
① can be damaged by the flow of vapor.
•
Follow the specified procedure for commissioning.
Danger of injury.
You can briefly open the drain valves
⑦ to clean the line. Hot vapor can escape in the process.
• Only open the drain valves
briefly, and close them again before vapor escapes.
To commission the pressure transmitter for vapor, proceed as follows:
1. Open both the shut-off valves ⑥ at the pressure tapping point.
2. Open the stabilizing valve
②.
3. Wait until the steam in the differential pressure lines
⑤ and in the equalizing vessels ⑧ has condensed.
4. Open the differential pressure valve
③ and the vent valve on the positive side of the pressure transmitter ① slightly,
until air-free condensate escapes.
5. Close the vent valve.
6. Open the vent valve on the negative side of the pressure transmitter ① slightly, until condensate escapes without
bubbles.
7. Close the differential pressure valve
③.
8. Open the differential pressure valve
④ slightly, until condensate escapes without bubbles, then close it.
9. Close the vent valve on the negative side
①.
10. Open the differential pressure valve
③ by rotating it in ½ turn.
11. Check and correct, if necessary, the zero point (4 mA) when the start of scale value is 0 kPa.
The result is only error-free if the differential pressure lines ⑤ have equally high condensate columns with the same
temperature. The zero calibration must be repeated if required if these conditions are fulfilled.
12. Close the stabilizing valve
②.
13. Fully open the differential pressure valves
③ and ④.
14. You can briefly open the drain valves
⑦ to clean the line.
15. Close the drain valve
⑦ before vapor escapes.
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