Process Unit 73 LF - Knick

Process Unit 73 LF
Temperature Compensation for
the Process Medium
The conductivity of the process solution is temperature
dependent. By entering a temperature coefficient
for the measured solution and a reference
temperature, all conductivity values can be calculated
for the reference temperature. During parameter
setting, you can choose the type of temperature
compensation:
No temperature compensation
Linear temperature compensation with entry of
temperature coefficient and reference temperature.
Temperature dependence of the conductivity is
more or less nonlinear. Therefore, the reference
temperature should be near the process temperature.
Here, the linearly compensated measured
value is closest to the ”true” conductivity value.
Temperature compensation for natural waters
to EN 27888. Compensation is effective in the
range 0 to 35 C. Reference temperature is
25 C.
Additionally with option 392: Temperature compensation
for ultrapure water with traces of impurity
(e.g. boiler feed water) down to ultrapure
H 2 O with 0.055 S/cm (25 C). Compensation
is effective in the range of 0 to 158 C.Reference
temperature is 25 C.
Depending on the existing traces of impurity
you can choose between:
– ultrapure water with ammonia (NH 3 ) for ordinary
boiler feed water or condensate, for
conductivity measurement without cation
filter
– ultrapure water with acid (HCl), for conductivity
measurement behind cation filter
– neutral ultrapure water (NaCl), for conductivity
measurement during water treatment
behind gravel bed filter
– alkaline ultrapure water (NaOH)
9–16 Capabilities