WT.050.560.001.UA.IM.0714
66
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA
W3T140188
The sensor has a very low dependence on pH-value, so you can use it in water
with varying pH-value. The sensor should be used only in potable water ap-
plications.
The sensor is designed such that a zero residual chlorine will yield zero current.
Therefore only a single point calibration is needed.
The flow block assembly, housing the Membrane Sensor, is designed to provide
a constant flow of water past the membrane surface. This and the potentio-
static three-electrode system ensure accurate and repeatable measured data.
•
FC1, Oz7, CD7:
The FC1 for Free Chlorine, the OZ7 for Ozone, and the CD7
for Chlorine Dioxide all work similarly, however, they utilize a silver/silver
chloride reference electrode, a different electrolyte, and a different mem-
brane to allow for the selectivity required for the different measurands.
3.4.6.1
Membrane Sensor for Free Chlorine FC1
The FC1 membrane sensor is a special sensor for measuring the concentration
of free chlorine in water. The sensor incorporates a pH buffer in the electrolyte
and is suitable for water with various pH values. The sensor may only be used
in clear water of potable water quality.
CAUTION: The electrode fingers (reference electrodes) and membrane are
extremely sensitive! Do not touch, soil or damage! Before unscrewing the
filled membrane cap, push the elastomer seal to one side to permit the inflow
of air through the vent underneath it! Otherwise, the membrane may be
damaged due to developing negative pressure. Do not sand down the light
yellowish-gray deposit of the electrode finger or wipe it in the direction of the
gold working electrode! The electrolyte may spray out of the valve opening.
Flush eyes and skin immediately with water after contact. Rinse away spilled
electrolyte with water. The electrolyte contains potassium halide and is acidic.
Commissioning the Membrane Sensor for Free Chlorine FC1
1. Unscrew the membrane cap from the electrode shaft.
2. Place the membrane cap and the G-holder on a clean, non-absorbent
pad and fill both with the included electrolyte bubble-free up to the
top thread on the inside of the cap.
3. Rub gold working electrode with the included lapping paper (special
emery). To do this, lay the lapping paper on a paper towel, take hold
of the corner and while holding the measuring cell vertically (without
G-holder), slide the electrode end two to three times over the rough
side of the lapping paper.
!
Summary of Contents for Wallace & Tiernan Depolox 3 plus
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