IM 50.560CA UA (B/4-03)
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
54
• 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 elec-
trolyte, and a different membrane to allow for the selectivity required
for the different measurands.
WARNING: DO NOT TOUCH THE REFERENCE ELECTRODE!
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 UNSCREW-
ING THE CAP. DO NOT REMOVE THE YELLOW-GREY LAYER
ON THE REFERENCE ELECTRODE.
NOTE: It is important that the membrane is in the direct sample
water flow. Because of this the flow-through assembly has a special
form where the sensor fits in.
3.5 pH Sensor Kit
3.5.1 Description
The USF/W&T pH sensor has a ceramic diaphragm and a silver/silver-
chloride reference electrode. The 3.0 mol KCl gel electrolyte does not
require replenishment.
To protect the sensitive measuring membrane the sensor is shipped with
a protection cap over its glass tip. This cap contains 3 mol KCl solution
to keep the sensor in a constant state of readiness. Leave the cap in place
on the sensor until it is about to be installed. Do not discard the cap but
keep it and use it to protect the sensor whenever it is removed from
service. Then fill the cap with water (not distilled) and place it over the tip
of sensor.
The pH sensor has a threaded plug-in head. Care must be taken to ensure
that the O-ring is present when connecting the head. A standard 1.5 m
long, shielded coaxial (measuring) cable is supplied with the pH sensor.
At one end the cable has a special plug which is screwed on to the threaded
plug-in head of the sensor. The other end of the shielded special cable is
connected directly to the intended terminal connection in the PCS control
module.
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