PART THREE - OPERATION
SECTION 4 - ANALYZER CONFIGURATION
Rev. 5-1000
Model C53 Conductivity Analyzer (universal-mount 1/2 DIN)
47
SET T FACTOR
(sensor’s GLI-certified
“T” factor)
GLI tests each sensor to provide a unique, certified tem-
perature T FACTOR because:
•
Temperature greatly affects conductivity measurement
accuracy.
•
The inherent ohm value of the Pt 1000 RTD temperature
element varies slightly from sensor to sensor, affecting
temperature measurement accuracy.
By entering the sensor’s unique T FACTOR, you enable the
analyzer to provide the highest possible measuring accu-
racy for both temperature and conductivity.
1.
With the
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screen displayed, use
Ø
Ø
key
to select the “SET T FACTOR” line.
2.
Press
ENTER key
to display a screen like
. Use
arrow keys
to adjust the dis-
played value to exactly match the sensor’s GLI-certified
T FACTOR, and press
ENTER key
to enter the value.
SPECIAL CASE -- ALTERED SENSOR CABLE LENGTH
(only for sensors with PT 1000 temperature elements*)
Changing the standard 20 ft. (6 m) sensor cable length, by
shortening it or adding an interconnect cable, affects tempera-
ture measuring accuracy. The GLI-certified T FACTOR is based
on standard cable length. To compensate for altered cable
length measuring error, change the certified T FACTOR entry:
•
Shortened Sensor Cable: To increase the analyzer tempera-
ture reading to match the known solution temperature,
decrease the T FACTOR by 3.85 ohms for each
°
C difference.
•
Added Interconnect Cable: To decrease the analyzer tem-
perature reading to match the known solution temperature,
increase the T FACTOR by 3.85 ohms for each
°
C difference.
Example:
Suppose the known solution temperature is 50
°
C and
the analyzer reads 53
°
C due to interconnect cable resistance.
Multiply the 3
°
C difference by 3.85 ohms to get 11.55. Then in-
crease the sensor T FACTOR by adding 11.55 to it and entering
that value. If, due to a shortened sensor cable, the analyzer was
reading 3
°
C less than the known solution temperature you would
decrease the sensor T FACTOR by subtracting 11.55 from it.
*Sensors with a PT 100 temperature element provide inherently less
accurate temperature readings and are not recommended.
