IM 12B6C3-E-E
5-13 Parameter setting
5-3-2. Temperature compensation and measuring functions.
Code 10 T.SENS Selection of the temperature compensation sensor. The default selection is
the Pt1000 Ohm sensor, which gives excellent precision with the two wire
connections used. The other options give the flexibility to use a very wide range
of other pH sensors.
Code 11 T.UNIT Celsius or Fahrenheit temperature scales can be selected to suit user preference.
Code 12 T.ADJ With the process temperature sensor at a stable known temperature, the
temperature reading is adjusted in the main display to correspond. The
calibration is a zero adjustment to allow for the cable resistance, which will
obviously vary with length.
The normal method is to immerse the sensor in a vessel with water in it, measure
the temperature with an accurate thermometer, and adjust the reading for
agreement.
Code 13 T.COMP Process compensation automatically allows for changes in the pH or ORP of the
process with temperature. The characteristic of each process will be different,
and the user should determine if this feature is to be activated, and what
compensation figure to choose.
The compensation is given in pH per 10 °C or mV per 10 ºC.
Example: For pure water with an alkali dose, (e.g. boiler feed water) a coefficient
of approx. 0.35pH can be expected. However, applications vary and
a simple test will determine what if any coefficient is suitable for the
process.
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