Liquisys M CLM223/253 Commissioning
Endress+Hauser 77
7.5 Calibration
Use the CAL key to access the calibration function group.
Use this function group to calibrate and adjust the transmitter. The calibration can be
performed in two different ways:
• By measuring in a calibration solution of known conductivity.
• By entering the exact cell constant of the conductivity sensor.
Please note the following:
• During initial commissioning of inductive sensors, an air set is absolutely essential for
residual coupling compensation (from field C111) so that the measuring system can
return precise measurement data.
• If the calibration procedure is aborted by pressing the PLUS and MINUS keys at the same
time (return to C114, C126 or C136) or if the calibration is faulty, then the previous
calibration data are reinstated. A calibration error is indicated by “ERR” and the sensor
symbol flashes on the display.
Repeat calibration!
• For each calibration, the device automatically switches to hold (factory setting).
• On completion of the calibration, the device returns to the measurement mode. The
"hold" symbol appears on the display during the hold dwell period (field S4).
• Only items C121 to C126 are relevant for conductive sensors.
Coding Field Range of
adjustment
(factory
settings in
bold)
Display Info
C
CALIBRATION
function group:
A0009142-EN
When commissioning
inductive sensors, an air set
is mandatory. The sensor
air set must be performed in
air and in a dry state.
Take the inductive sensor out of the liquid and
dry it fully.
A0025597
C111 Residual coupling
start calibration
(air set)
Current
measured value
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