IM 50.560CA UA (B/4-03) 13
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
2.2 Bare Electrode (Free Chlorine) Sensor Kit
The flow block assembly with the sensors should be installed in a frost-
protected location and, where possible, in a heated room.
The sample water should provide a minimum of approximately 2 psi (0.2
bar) water gauge pressure at the measuring cell inlet.
The sample water line should be as short as possible. In the water line to
the measuring cell a strainer (size 0.5 mm) must be installed.
The sample water inlet must be connected to a stop valve (connection 1/
4" - 18 NPT). The tapping point for the sample water must be positioned
to ensure a bubble-free flow of water and a complete mixing of the dis-
infectant.
The drain line must be unpressurized.
2.3 Membrane Sensors (See Dwg. 50.560.160.020 in Section 3)
WARNING: DO NOT TOUCH THE REFERENCE ELECTRODE!
DO NOT TOUCH THE PRESSURE BALANCE DIAPHRAGM!
Before unscrewing the membrane cap, remove the elastomer seal to allow
air into the vent hole. Not doing this will cause a vacuum to occur which
will damage the membrane when unscrewing the cap. Do not remove the
yellow-grey layer on the reference electrode.
Unscrew the membrane cap from the electrode shaft and fill it to the top
with the enclosed electrolyte. Strike the electrode shaft against the mem-
brane cap to remove air bubbles. Clean the gold working electrode with
the enclosed lapping paper (special abrasive paper). To do this, place the
special abrasive paper on a paper towel. While holding on to a corner of
the paper move the tip of the electrode of the vertically held probe one or
two times over the rough side of the special abrasive paper. Ensure that
the elastomer seal completely covers the vent hole. While holding the
electrode shaft in a vertical position, screw on the cap onto the shaft.
Surplus electrolyte will escape through the vent hole in the membrane cap
below the elastomer seal. Do not hold the vent hole or press on the elas-
tomer seal! If you detect air bubbles in the electrolyte, repeat the filling
process. Wash away the escaped electrolyte with water.
NOTE: The membrane cap must be completely screwed to the elec-
trode shaft so that no gap remains between membrane cap and elec-
trode shaft. The sensor requires a one- to two-hour run in time before
!
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