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Calibration of the conductivity sensor CD
Calibration should only take place with calibration solvents in accordance with DIN EN 27888 !
Inappropriate calibration leads to undefined display values !
Dry and zero point calibration
With the
calibration method CAL. CD ZERO
, it is possible to compensate measuring errors (offset) which occur due to
very long supply lines to the measuring sensor.
The sensor is calibrated
A
dry
A
, i.e. it is not dipped into the measuring medium:
a) Either with a built-in sensor, before the tube system is filled
or
b) with a not yet built-in sensor, but already equipped with the correct cable length.
Call the following menu option to start calibration
"M"
SERVICE
Cal. CD Zero
and start by pressing
A
ENTER
@
.
The unit now corrects the measuring error caused by the cable length via subtraction. The process ends automatically.
Desired value calibration
With the
calibration method CAL. CD desired value
, it is possible to correct measuring errors caused by a soiled
sensor.
It is recommended to also calibrate with this method if there are high accuracy demands in a small measuring range.
This calibration method also enables measurements with a sensor whose cell constant is not exactly known.
Procedure:
Carry out the calibration with an appropriate KCI standard calibration solvent. For
this, dip the measuring sensor into the calibration solvent. Please observe that the
sensors are free moving in the vessel.
–
With automatic temperature compensation:
First, enter a temperature
coefficient of 1.90%/
C in the BASIC PROGRAM menu
A
Temp.-comp.
@
and
the value of the standard calibration solvent at 25
C under desired value.
After dipping the sensor into the calibration solvent, wait approx. 2 minutes
before starting the calibration until the sensor has the same temperature as
the solvent.
–
With manual temperature compensation:
If you wish to calibrate a sensor
without a temperature transmitter, you have to enter
"manual
temp.-compensation"
in the basic program and the temperature of the
calibration solvent under
"Temperature"
. The temperature of 25
C for the
calibration solvent is also valid here.
1. Call the menu
A
Calibrate CD
@
"M"
SERVICE
Cal. CD Desired value
2. Enter the desired value of the conductivity and save the value by pressing
A
ENTER
@
.
3. Call the following menu option to start the calibration
"M"
SERVICE
Cal. CD Start
and start by pressing
A
ENTER
@
.
The unit now corrects the measuring error by forming a correction factor. Calibration is ended automatically.
Note!
Inappropriate calibration can lead to the display of undefined values. Incorrect calibrations can only be
corrected via a new calibration or via a
A
CAL. CD RESET
@
.
Note on calibrating:
Summary of Contents for Softmaster ROE 2
Page 31: ...31 35 Technical appendix Example for an osmosis plant layout ...
Page 32: ...32 35 Connection example displayed relay position Device deenergized ...
Page 33: ...33 35 Connection example for 24 V displayed relay position Device deenergized ...
Page 34: ...34 35 Conformity Declaration ...
