KROHNE OPTISENS ODO2000, Handbook

Page: 27 / 52

OPERATION
5
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OPTISENS ODO 2000
www.krohne.com 10/2016 - 4003689502 - MA OPTISENS ODO 2000 R02 en
5.2.2 Calibration with a signal converter
The sensor requires a 2-point calibration. The sensor is factory calibrated by means of standard
solution and it is ready for use. The operator can perform the field calibration via controller by
means of the sensitivity and zero point adjustment. It has to be done in the order sensitivity first
and zero point calibration thereafter.
To avoid alarms on the distributed control system (DCS) when temporarily 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) of 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. In this mode the
calibration can be started. Activate the manual "hold function" in the first step.
CAUTION!
•
Never touch or scratch the optical disk (luminophore with black silicone cover) of the sensor.
•
Make sure that the optical disk is clean and dust-free. If necessary, clean the optical disk as
described on page 41
INFORMATION!
It is suggested to verify the sensor periodically and calibrate in case of need to get the requested
accuracy on the specific application.
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". For
more details about how to select the manual hold function refer to the signal converter manual.