YSI IQ SensorNet 2020 XT Terminal - Manual (Page 106)

Operation System 2020 XT USB
4 - 28 ba76019e01 12/2012
4.8 General course when calibrating, cleaning, servicing
or repairing an IQ sensor
When an IQ sensor is calibrated, cleaned, serviced or repaired, the
maintenance 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.
Course
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 does no longer change.
6 Switch off the maintenance condition for the sensor (see
section 4.8.3).
The display of the sensor in the measured value display does
no longer flash.