KROHNE OPTISENS PH 9100 EN - Manual (Page 41)

TECHNICAL DATA
6
41
OPTISENS PH 9100
www.krohne.com 09/2012 - 4002314801 - MA OPTISENS PH 9100 R02 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