
Requirement
All valves are closed.
Procedure
To commission the transmitter for steam or liquid, proceed as follows:
1.
Open the shut-off valve for the test connection ④.
2. Via the test connection of the shut-off module ②, apply the pressure corresponding to the
start of scale value to the pressure transmitter ①.
3. Check the start of scale value.
4. If the start of scale value differs from the value desired, correct it.
5. Close the shut-off valve for the test connection ④.
6. Open the shut-off valve ⑥ at the pressure tapping point.
7. Open the shut-off valve for the process ③.
9.4 Differential pressure and flow rate
9.4.1 Safety notes for commissioning with differential pressure and flow rate
WARNING
Incorrect or improper operation
If the lock screws are missing or are not sufficiently tight, and/or if the valves are operated
incorrectly
or improperly, it could lead to serious physical injuries or considerable damage to
property.
Measure
● Take care that the locking screw and/or the vent valve are screwed in and tightened.
● Ensure that the valves are operated correctly and properly.
WARNING
Hot mediums
In the case of hot mediums, the individual operational steps should be carried out one after
the other. Otherwise, it could lead to excessive heating, thus causing damage to the valves
and the transmitter.
Commissioning
9.4 Differential pressure and flow rate
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 153
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