KROHNE OPTISENS PH 9500 - Manual (Page 42)

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TECHNICAL DATA
42
OPTISENS PH 9500
www.krohne.com 08/2012 - 4001929601 MA OPTISENS PH 9500 R01 en
The voltage change of a pH sensor at 25°C / 77°F is around 59 mV for each pH unit. This is also
called the slope of the pH sensor. The slope is temperature dependent and decreases over life
time of the sensor.
To compensate for the temperature dependency of the pH measurement, the temperature of the
medium can be measured and automatically compensated in the signal converter.
Figure 6-2: Optimal slope at 25°C / 77°F
Figure 6-3: Temperature dependency of the slope