ATI
Q46H/79PR Chlorine Manual
P
art 5 – Sensor Assembly
30
O&M Manual
Rev-E (5/17)
7. Slowly screw the chamber onto the sensor body. A small amount of electrolyte will run out of
the hole from which the vent screw was removed. Place a paper towel around the sensor to
absorb the electrolyte overflow. The electrolyte is harmless and will not irritate skin. Tighten
the chamber until the o-ring at the top of the chamber is compressed. Once again, do not
use tools to tighten.
8. Shake excess electrolyte from the fill hole on the side of the sensor and replace the vent
screw.
The sensor is now ready for operation. The membrane should be stretched tightly across the tip
of the sensor.
CAUTION:
When handling the assembled sensor, do not set the sensor on its tip or damage
to the membrane will result. Severe impacts on the tip of the sensor from dropping
or other misuse may cause permanent damage to the sensor.
5.2
Optional pH Sensor
An optional battery powered pH sensor is available for use with the Q46H/79PR system that puts
out a nominal signal of 0.3-1.5 VDC proportional to pH over a range of 0-14 pH units. The Q25P
pH sensor can also be used and provides a standard 4-20 mA signal. The sensor is shipped with
a protective rubber boot containing a small amount of salt solution to keep the glass elements in
good condition and ready for use.
No special preparations are required for use of this electrode. The protective boot should remain
in place until the system is to be placed into continuous service.
Do not remove the protective
boot and allow the sensor to sit in the air for an extended period of time. The pH
electrodes MUST stay wet.
When ready for operation, simply remove the rubber boot from the end of the sensor and place
the sensor into the inlet chamber of the chlorine overflow cell. It is placed directly above the
sample inlet tube. You will need to slide the flowcell chamber cover out of the way to put the pH
sensor in place.
