PART THREE - OPERATION
SECTION 5 - ANALYZER CALIBRATION
Model C53 Conductivity Analyzer (universal-mount 1/2 DIN)
Rev. 5-1000
62
S
ECTION
5
5.1 Things to Know
About Calibration
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Each contacting conductivity sensor has a unique zero point
and offset. Consequently,
always zero the sensor when
calibrating it for the first time
(Section 5.2). Zeroing pro-
vides the best possible measuring accuracy and, when
using two sensors, eliminates any discrepancies between
Sensor A and B measurement channels. After zeroing, cali-
brate for sensor offset using the recommended DRY-CAL
method (Section 5.3) or the traditional, wet 1-POINT
SAMPLE method (Section 5.4).
Calibration Tip!
Conductivity measurement is greatly
affected by small changes in temperature. To measure
conductivity and temperature more accurately, GLI
highly recommends using the DRY-CAL method to cali-
brate for sensor offset. (This is actually a normal part of
configuring the sensor characteristics during initial
startup.)
DRY-CAL
eliminates the need for conduc-
tivity reference solutions.
It also automatically sets the
analyzer measuring range to match the inherent range
of the sensor’s cell constant.
Furthermore, DRY-CAL
eliminates the need to periodically re-calibrate!
The
only requirement, depending on the application, may be
periodic cleaning of the sensor. Only when the sensor is
replaced is a new DRY-CAL calibration necessary.
In addition to zeroing the sensor(s) and calibrating for sen-
sor offset, you can also calibrate the analyzer analog output
(1 and 2) values. Refer to Section 5.4 for details.
These instructions calibrate Sensor A. If using a second
sensor, calibrate Sensor B in the same way using its re-
spective menu screens.
NOTE:
When the passcode feature is enabled (Section
4.7), you must successfully enter the passcode
before attempting to calibrate the analyzer.
Also, an in-progress calibration can always be
aborted by pressing the ESC key.
After “ABORT:
YES?” screen appears, do one of the following:
•
Press
ENTER key
to abort. After the “CONFIRM
ACTIVE?” screen appears, press
ENTER key
ANALYZER CALIBRATION
