PART THREE - OPERATION
SECTION 4 - TRANSMITTER CALIBRATION
PRO-series Model E3 Electrodeless Conductivity Transmitter
5
S
ECTION
4
4.1 Important Information
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Each electrodeless conductivity sensor has a unique zero
point and span. Consequently,
always zero the sensor
when calibrating it for the first time
(Section 4.2). Zeroing
provides the best possible measuring accuracy. After zero-
ing, calibrate for sensor span using one of the available
methods, and periodically thereafter to maintain best meas-
urement accuracy. Over time, some processes such as
heavy slurries may plug the sensor hole, causing minor
measurement errors. The time between calibrations, and
the rate of measurement drift can vary considerably with
each application and its specific conditions.
Calibration Tip!
Establish a maintenance program to
keep the sensor relatively clean and the measuring sys-
tem calibrated. The weekly or monthly intervals between
performing maintenance will be influenced by the char-
acteristics of the process solution, and can only be
determined by operating experience.
Since the inherent ohm value of each sensor’s Pt 1000
RTD temperature element varies slightly, GLI tests each
element to provide a unique, GLI-certified temperature
T FACTOR shown on a label attached to the sensor
cable. If this factor was not previously entered during
configuration in Section 3.2, subheading “SET T FACTOR,”
enter it now before zeroing or calibrating
to provide
the best possible measuring accuracy.
NOTE:
When the passcode feature is enabled (Section
3.5), you must successfully enter the passcode
before attempting to calibrate the transmitter.
An in-progress calibration can always be aborted
by pressing the ESC key.
After the “ABORT: YES?”
screen appears, do one of the following:
•
Press
ENTER key
to abort. After the “CONFIRM
ACTIVE?” screen appears, press
ENTER key
to
return the analog output to its active state
(MEASURE screen appears).
•
Press
×
×
or
Ø
Ø
key
to choose “ABORT: NO?”
screen, and press
ENTER key
to continue cali-
bration.
TRANSMITTER CALIBRATION
