KROHNE OPTISENS PH 8390 EN - Manual (Page 18)

3
INSTALLATION
18
OPTISENS PH 8390
www.krohne.com 03/2012 - 4001930601 MA OPTISENS PH 8390 R01 en
3.8 Installing an external temperature sensor
Since the slope of the pH electrode is temperature-dependent, a temperature compensation
makes sense if the temperature of your measuring medium varies.
If the pH electrode does not have an internal Pt100/1000 temperature sensor, you should use an
external temperature sensor. There are various different possibilities of adding an external
temperature sensor to your pH measurement installation. They can not be explain in detail in
this document. Nevertheless, you should follow the general guidelines.
General guidelines for external temperature sensor installation
• The temperature sensor should be calibrated using a reference thermometer. For further
information refer to Temperature compensation on page 25.
• The temperature should be measured close to the pH electrode in the same medium to avoid
temperature differences. For example, surface water may have a different temperature than
deeper water.
Suitable external temperature sensors are
• Pt100 in 2-wire or 3-wire connection
• Pt1000 in 2-wire or 3-wire connection
.book Page 18 Monday, March 19, 2012 1:52 PM