JUMO dTRANS CR 02, Operating Manual, Page: 97 / 120

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16 Appendix
the conductivity that would exist for a reference temperature from the current
conductivity and the current temperature. This is then displayed. This process
is called temperature compensation. Modern transmitters offer different ways
to perform this temperature compensation.
- Linear compensation (constant temperature coefficient).
This type of compensation can be applied to many kinds of normal water,
with acceptable accuracy. The temperature coefficient used is then approx.
2.2 %/°C
- Natural water (EN27888 or ISO 7888).
In this case, so-called non-linear temperature compensation is used.
According to the standard cited above, the relevant type of compensation
can be applied to natural groundwater, spring water and surface water.
The definition range for the water temperature is as follows:
0 °C
≤
T < 36 °C
Conductivity of the water is compensated in the range from 0 °C to 36 °C.
- ASTM1125-95.
This type of temperature compensation is used in measurements of ultra-
pure water. The highly non-linear nature of the temperature dependency for
neutral, acidic and alkaline impurities is taken into consideration in
accordance with the standard.
The definition range for the water temperature is as follows:
0 °C < T < 100 °C.
Conductivity of the water is compensated in the range from 0 °C to 100 °C.
Temperature compensation (pH or ammonia)
The pH value of a measurement solution depends on the temperature. Since
the pH value is not always measured at the reference temperature, the
instrument is able to perform a temperature compensation.
The sensor signal for the ammonia measurement is temperature-dependent.
The instrument can perform temperature compensation.
The redox potential of a measurement solution is not temperature-dependent!
Temperature compensation is not required.