KROHNE OPTISYS CL 1100 EN - Manual (Page 27)

OPERATION
5
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OPTISYS CL 1100
www.krohne.com 01/2013 - 4002492301 - MA OPTISYS CL 1100 R02 en
Step 2: entering a pH value manually
• If you have activated the manual pH compensation as described in the previous step, you can
enter a pH value using or .
• Press ^ to confirm the value.
i The manually entered pH value will be used for pH compensation.
• If you want to return to the measuring mode, press ^ several times.
5.3.4 Calibrating the free chlorine/chlorine dioxide/ozone measurement
Calibration is necessary in regular intervals or when installing a new sensor.
To avoid alarms on the distributed control system (DLC) when temporary removing the sensor
(i.e. for maintenance), the signal converter has a hold function. This function "freezes" all
outputs (i.e. the display and the current outputs) on the last measured value.
After starting-up the signal converter, the measuring screen appears. This is the standard
screen which is displayed automatically in the normal operating mode. If you are in this mode
and you want to initiate a calibration, you have to activate the manual hold function performing
the following steps:
INFORMATION!
When calibrating a free chlorine/chlorine dioxide/ozone measurement, keep in mind that the
measuring system as a whole is calibrated, and not only the sensor. Therefore the measuring
system has to be re-calibrated if, for example, the measuring medium changes.
INFORMATION!
As an indication that the manual hold function is active, the "warning sign" in the upper left
corner of the display appears. Meanwhile the status messages show "checks in progress".