Endress+Hauser CM14 - Page 24

Commissioning CM14
24 Endress+Hauser
Alkali (e.g. NaOH) Approx. 1.9 %/K
Acids (e.g. HNO3) Approx. 1.3 %/K
NaCl compensation
NaCl compensation is activated using the setting Extended setup → Input → Temp. comp. =
NaCl (IEC 746-3).
In the case of NaCl compensation (as per IEC 60746), a fixed non-linear curve specifying the
relationship between the temperature coefficient and temperature is saved in the device. This
curve applies to low concentrations of up to approx. 5 % NaCl.
0
48
96
144
2.1
2.3
2.5
2.7
T [°C]
a [%/K]
A0008939
Compensation for natural water
Compensation for natural water is activated using the setting Extended setup → Input →
Temp. comp. = Water ISO 7888.
A non-linear function in accordance with ISO 7888 is saved in the device for temperature
compensation in natural water.
Ultrapure water compensation (for conductive sensors)
Compensation for ultrapure water is activated using the setting Extended setup → Input →
Temp. comp. = UPW HCl or UPW NaCl.
Algorithms for pure and ultrapure water are stored in the device. These algorithms take the
dissociation of the water and its temperature dependency into account. They are used up to
conductivity levels of approx. 100 µS/cm.