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8 installing an external temperature sensor, Installation – KROHNE OPTISENS PH 9100 EN User Manual

Page 19

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INSTALLATION

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19

OPTISENS PH 9100

www.krohne.com

09/2012 - 4002314801 - MA OPTISENS PH 9100 R02 en

3.8 Installing an external temperature sensor

Since the slope of the pH sensor is temperature-dependent, a temperature compensation makes
sense if the temperature of your measuring medium varies.

If the pH sensor does not have an integrated 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 27.

• The temperature should be measured close to the pH sensor 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