JUMO dTRANS p02 - 8.3 Measuring the Absolute Pressure

8 Commissioning
26
8.3 Measuring the absolute pressure
Gases
(1) Transmitter
(2) Shut-off fitting
2A shut-off valve to process
2B shut-off valve for test connection
(3) Pressure line
(4) Shut-off valve
(5) Shut-off valve
(6) Condensation vessel
(7) Purge valve
Pressure
application
Initial state: all valves closed
Operate the shut-off fittings in the following order:
✱
Open shut-off valve (4) at the pressure tapping.
✱
Open shut-off valve (2A).
✱
Check measurement start.
✱
Close shut-off valve (2A).
✱
Open shut-off valve (2B).
✱
Apply a pressure that corresponds to the measurement start
to the transmitter, via the test connection of the shut-off fitting (2).
✱
Check output current at the measurement start and correct it if required,
➩
"Output current, measurement start and end", page 38.
✱
Close shut-off valve (2B).
✱
Open shut-off valve (2A).
Transmitter below
the pressure tapping
(exception)
Transmitter above
the pressure tapping
(standard arrangement)