8
Commissioning
Page 124
gas-lab
Q1
7
Purge the pressure regulator by repeatedly closing and opening the inlet
valve: For this, close the inlet valve while the gas is flowing until the control
pressure has dropped to 0. Afterwards, re-open the valve very slowly.
Quickly repeat this cycle 5 times without stopping.
8
The device remains in the
Purge
mode for about 5 minutes while the gas is
flowing and then returns to the
Process gas measurement
mode. The
display shows
Waiting for PG
.
9
After the device has returned to the
Process gas measurement
mode, the
other gas paths can be purged in the same way.
After a cold start at room temperature the sensor system takes about 1 hour for
warming up. Afterwards, it is ready for operation. The final warm-up stage of the
sensor system and thus the measurement stabilisation, however, takes 3 hours.
This is why the device automatically performs a 1-point calibration with methane
12
15
hours after it has been switched on. If you would like to perform valid
measurements during these first 12 hours, we recommend to manually carry out
a 1-point calibration. Nevertheless, the automatic calibration will be triggered
after 12 hours at any rate.
15
This waiting time can be adjusted. This is important for a redundant (double) installation
of the measurement devices, since else both
– e.g. after power failure – will calibrate at
the same time and during this time none of both can be used. Please contact Elster for
further questions.