KROHNE OPTISENS PH 8390 EN - Manual (Page 40)

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TECHNICAL DATA
40
OPTISENS PH 8390
www.krohne.com 03/2012 - 4001930601 MA OPTISENS PH 8390 R01 en
The voltage change of a pH electrode at 25°C / 77°F is around 59 mV for each pH unit. This is also
called the slope of the pH electrode. The slope is temperature dependent and decreases over life
time of the electrode.
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 of the electrode at 25°C / 77°
Figure 6-3: Temperature dependency of the electrode slope
.book Page 40 Monday, March 19, 2012 1:52 PM