wtw DIQ/S 282, Operating Manual, Page: 74 / 186

Operation DIQ/S 28X
74
ba77168d02 03/2017
4.8 General course when calibrating, cleaning, servicing or
repairing an IQ sensor
When an IQ sensor is calibrated, cleaned, serviced or repaired, the mainte-
nance condition for the relevant IQ sensor should always be switched on.
In the maintenance condition
 the system does not react to the current measured value or the condition of
the selected IQ sensor
 linked outputs are frozen
 IQ sensor errors do not prompt changes in the conditions of linked outputs.
The maintenance condition for IQ sensors is automatically activated
 during calibration. After calibration the IQ sensor remains in the maintenance
condition until the maintenance condition is switched off manually (see
section 4.8.3)
 during a compressed air cleaning cycle.
Therefore, keep to the following course when you calibrate, clean, service or
repair an IQ sensor.
Outlet
4.8.1 Maintenance condition of IQ sensors
The following diagram gives you an overview of when an IQ sensor is in the
maintenance condition.
1 Switch on the maintenance condition for the IQ sensor (see
section 4.8.2).
The display of the sensor in the measured value display flashes.
2 Pull the sensor out of the sample.
3 Perform the calibration in the laboratory, cleaning, maintenance or
repair (removing and replacing) of the sensor (about these topics, see
the component operating manual of the corresponding sensor).
4 Submerse the sensor in the sample again.
5 Wait until the measured value no longer changes.
6 Switch off the maintenance condition for the sensor (see section 4.8.3).
The display of the sensor in the measured value display no longer
flashes.