TPS Aqua-pH - Checking the Reference Junction; Determining Instrument or Sensor Faults

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10.1.3 Temperature Compensation
The slope of a pH sensor (section 10.1.2) is affected by temperature. This
effect is compensated for either by using an Automatic Temperature
Compensation (ATC) sensor or by entering the sample temperature
manually. Figure 10-3 shows the slope of a pH sensor at various
temperatures.
-600
-400
-200
0
200
400
600
0 7 14
Electrode
Potential (mV) at
0 oC (54mV/pH)
Electrode
Potential (mV) at
50 oC (64mV/pH)
Electrode
Potential (mV) at
100 oC (74mV/pH)
pH Electrode Response, as a Function of Temperature
Electrode Response (mV)
pH
Figure 10-3