Siemens SITRANS P DS III - Servicing and Maintenance

SITRANS P DS III/P410 (7MF4.33.. 7MF4.34.. 7MF4.35..)
32 A5E03434626-04, 05/2015
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.
6
Servicing and maintenance
6.1
Basic safety instructions
WARNING
Impermissible repair of explosion protected devices
Danger of explosion in areas subject to explosion hazard.
•
Repair must be carried out by Siemens authorized personnel only.
WARNING
Impermissible accessories and spare parts
Danger of explosion in areas subject to explosion hazard.
• Only use original accessories or original spare parts.
• Observe all relevant installation and safety instructions described in the instructions for the device or enclosed with the
accessory or spare part.
WARNING
Maintenance during continued operation in a hazardous area
There is a danger of explosion when carrying out repairs and maintenance on the device in a hazardous area.
• Isolate the device from power.
- or -
•
Ensure that the atmosphere is explosion-free (hot work permit).