3. Description
DEPOLOX® 400 M
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EN
3.10.5 Membrane sensors TC3 (total
chlorine) and FC2 (free chlorine)
The membrane sensor is a membrane-cove-
red potentiostatic 3-electrode measuring cell
with a specially positioned counter electrode.
The measuring electrode is membrane-cove-
red and located, together with the reference
electrode, in an electrolyte chamber that is
separated from the sample water and con-
tains a special electrolyte.
In this measurement method, chlorine diffu-
ses from the sample water through the mem-
brane 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 membrane sensor elec-
tronics. As a result of integrated temperature
compensation, the measuring signal is inde-
pendent of the sample water temperature.
3.10.6 Membrane sensor CD7 (chlorine
dioxide)
Membrane sensor CD7 allows selective mea-
surement of the chlorine dioxide content in all
types of water, including ultrapure water (LF >
1µS/cm), without cross-sensitivity to chlorine,
bromine and hydrogen peroxide, but cross-
sensitive to ozone and peracetic acid. Memb-
rane sensor CD7 does not exhibit pH-depen-
dency and is therefore suitable for water with
changing pH values.
3.10.7 Membrane sensor OZ7 (ozone)
Membrane sensor OZ7 allows selective mea-
surement of the chlorine dioxide content in all
types of water, including ultrapure water (LF >
1µS/cm), without cross-sensitivity to chlorine,
bromine and hydrogen peroxide, but cross-
sensitive to chlorine dioxide and peracetic
acid. Membrane sensor OZ7 does not exhibit
pH-dependency and is therefore suitable for
water with changing pH values.
NOTICE
The membrane sensors TC3 and FC2 can be
installed in the non-pressurized and pressu-
rized version of the VariaSens C flow cell.
NOTICE
Membrane sensor CD7 can be installed in the
non-pressurized and pressurized version of
the VariaSens C flow cell.
NOTICE
Membrane sensor OZ7 can be installed in the
non-pressurized and pressurized version of
the VariaSens C flow cell.
