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MODEL SOLU COMP II SECTION 6.0
CALIBRATION
6.10 CALIBRATING THE ANALYZER - CONDUCTIVITY.
6.10.1 Purpose
1. After a conductivity analyzer has been in service for a period of time recalibration may be necessary.
2. To check the calibration of the Solu Comp II, see Section 8.7. If the calibration does not meet specifications,
the analyzer can be recalibrated according to Section 6.10.2.
3. To calibrate the Solu Comp II, replace the conductivity cell with a known resistance and make the analyzer
reading match the resistor value. The resistor(s) used for calibration must be accurate to within ±0.1%.
6.10.2 Procedure
1. Use a standard resistor (accuracy ±0.1%) or a standard decade box (accuracy ±0.1%) for the calibration.
2. Choose the resistor based on the cell constant being used and the range of the measurement.
Some of the conductivity values in the table are near the extreme ends of the recommended range for the cell
constant. Refer to the table in Section 8.4.5 for recommended ranges.
3. Disconnect the sensor leads and connect the standard resistor or decade box to terminals 4 and 6 on TB5.
If a standard decade box is being used, keep the leads as short as possible (less than 5 ft). It is not necessary
to disconnect the RTD leads.
Cell constant Conductivity (
µµ
S/cm) Resistor (k
ΩΩ
)
0.01 <0.5 100
0.5 - 5.0 10
>5 1
0.10 <0.5 1000
0.5 - 5.0 100
5 - 50 10
>50 1
1.0 <5 1000
5 - 50 100
50 - 500 10
>500 1
10 50 - 500 100
500 - 5000 10
>5000 1