DEPOLOX
®
400 M
Description
3.
29
3.8.3
Fluoride sensor
Fluoride measurement using a fluoride-ion-selective electrode is used for
continuous identification of fluoride ions in the solution. To obtain a cor
-
rect reading, the pH value of the measured medium must be within a
range from pH 5 to pH 8.
The reference system is filled with electrolyte.
The fluoride sensor can be installed in the non-pressurized version of the
flow cell modules DEPOLOX
®
5 C and VariaSens C.
The fluoride sensor can also be installed in the Y-style flow-through
assembly for individual measurement.
Attention!
Rapid, repeated changes in temperature result in a constant change in
the potential. This can cause functional failure of the electrode.
3.8.4
Membrane sensors TC3 (total chlorine) and FC2 (free
chlorine)
The membrane sensor is a membrane-covered potentiostatic 3-elec
-
trode measuring cell with a specially positioned counter electrode. The
measuring electrode is membrane-covered and located, together with
the reference electrode, in an electrolyte chamber that is separated from
the sample water and contains a special electrolyte.
In this measurement method, chlorine diffuses from the sample water
through the membrane and, in combination with the electrolyte, triggers
an electrical signal at the measuring electrode. This electrical signal is
proportional to the chlorine concentration and is amplified by the mem
-
brane sensor electronics. As a result of integrated temperature compen
-
sation, the measuring signal is independent of the sample water
temperature.
The membrane sensors FC2 and TC3 can be installed in the pressure-
free and pressurized version of the flow cell module VariaSens C.
3.8.5
Membrane sensor CD7 (chlorine dioxide)
Membrane sensor CD7 allows selective measurement of the chlorine
dioxide content in all types of water, including ultrapure water (LF > 1µS/
cm), without cross-sensitivity to chlorine, bromine and hydrogen perox
-
ide, but cross-sensitive to ozone and peracetic acid. Membrane sensor
CD7 does not exhibit pH-dependency and is therefore suitable for water
with changing pH values.
Membrane sensor CD7 can be installed in the pressure-free and pressur
-
ized version of the flow cell module VariaSens C.
Содержание WALLACE & TIERNAN DEPOLOX 400 M
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