Endress+Hauser Liquisys M CLM223/253, Operating Instructions Manual

Page: 69 / 112

Liquisys M CLM223/253 Commissioning
Hauser 69
6.6 Calibration
To access the "Calibration" function group, press the CAL key.
This function group is used to calibrate and adjust the transmitter. Two different types of
calibration are possible:
• Calibration by measurement in a calibration solution of a known conductivity.
• Calibration by entering the exact cell constant of the conductivity sensor.
Pay attention to the following:
• At first start-up of inductive sensors, an airset is absolutely required in order for the
measuring system to be able to generate accurate measuring values.
• 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 the “ERR” message and
flashing of the sensor symbol on the display.
Repeat calibration!
• The instrument is automatically switched to hold during calibration (factory setting).
• After calibration, the system jumps back to the measuring mode. During the hold dwell
period the hold symbol is displayed.
• For conductive sensors only the fields C121 to C126 are relevant.
Basic version does not include functions in
italic .
Coding Field Selection or range
(factory settings bold) Display Info
C
Function group
CALIBRATION
Calibration settings.
C1 (1)
Calibration of
inductive sensors
with a ring-shaped
opening
Airs = Airset (1)
Cellc = cell constant (2)
InstF = installation
factor (3)
When commissioning inductive sensors,
an airset is mandatory.
The calibration of the sensor is to be
performed in air. The sensor must be dry.
Remove sensor from the medium and dry completely .
C111
Residual coupling
start calibration
(airset) current measured value Start calibration with CAL.
C112
Residual coupling is
displayed (airset)
-80.0 to 80.0 μ S/cm
Residual coupling of measuring system
(sensor and transmitter).
C
CALIBRAT
C1
Calibrat
AirS
C111
µS/cm
AirSet
0.0
C112
µS/cm
AirSetVal
5.3