PART THREE - OPERATION
SECTION 4 - TRANSMITTER CALIBRATION
PRO-series Model C3 Conductivity Transmitter
Rev. 0-201
54
☞
1.
Depending on the situation, do one of the following:
■
When Keeping Sensor Installed:
Obtain a sample of the process solution and deter-
mine its value using laboratory analysis or a
recently calibrated portable meter.
■
When Using a Reference Solution:
A. Prepare a conductivity reference solution using
your normal method. Its value should be near
the typical measured process value for best
accuracy. When the value is relatively low
(between 200 and 100,000 microSiemens/cm),
you may want to use the data in Table C to
prepare the reference solution. Add the listed
grams of pure, dried NaCl to one liter of high
purity, de-ionized, CO
2
-free water that is 25
°
C
to obtain the listed conductivity. Solution con-
ductivity can be decreased by dilution with de-
ionized water.
Table C -- CONDUCTIVITY REFERENCE SOLUTIONS
Desired Solution Value
Grams NaCl
µS/cm
mS/cm
ppm (NaCl)*
To Be Added
100
200
500
0.10
0.20
0.50
50
100
250
0.05
0.10
0.25
1000
2000
3000
1.00
2.00
3.00
500
1010
1530
0.50
1.01
1.53
4000
5000
8000
4.00
5.00
8.00
2060
2610
4340
2.06
2.61
4.34
10,000
20,000
10.00
20.00
5560
11,590
5.56
11.59
*When using ppm measuring scale for compounds other
than NaCl, refer to appropriate chemistry handbook for ref-
erence solution formulation.
B. Thoroughly rinse the clean sensor in de-
ionized water. Then fully immerse the sensor
electrodes in the prepared reference solution.
Important: Allow the sensor and solution
temperatures to equalize.
Depending on their
temperature differences, this may take a few
minutes.
NOTE:
Suspend the sensor to prevent its elec-
trodes from touching the container.
