ATI
Q46H/63 Combined Chlorine System
Part 9 – System Maintenance
64
O&M Manual
Rev-K (11/18)
NOTE: DO NOT use a soap containing any oils (such as lanolin). Oils can coat the glass
electrode and harm sensor performance.
Soak the sensor for several minutes in the soap solution.
Use a small, extra-soft bristle brush (such as a mushroom brush) to thoroughly clean the
electrode and saltbridge surfaces. If surface deposits are not completely removed after
performing this step, use a dilute acid to dissolve the deposits. After soaking, rinse the sensor
thoroughly with clean, warm water. Placing the sensor in pH 7 buffer for about 10 minutes will
help to neutralize any remaining acid.
NOTE: DO NOT soak the sensor in dilute acid solution for more than 5 minutes. This will
help to prevent the acid from being absorbed into the saltbridge.
WARNING:
ACIDS ARE HAZARDOUS. Always wear eye and skin protection when
handling. Follow all Material Safety Data Sheet recommendations. A hazardous chemical
reaction can be created when certain acids come in contact with process chemicals.
Make this determination before cleaning with any acid, regardless of concentration
.
9.6
Replacing the Saltbridge and Reference Buffer Solution
1.
Hold the sensor with the process electrode pointing up. Place a cloth or towel around the
saltbridge. Turn the saltbridge counterclockwise (by hand) to loosen and remove the
saltbridge. Do NOT use pliers.
2.
Pour out the old reference buffer by inverting the sensor (process electrode pointing down).
If the reference buffer does not run out, gently shake or tap the sensor.
3.
Rinse the reference chamber of the sensor with de-ionized water. Fill the reference chamber
of the sensor with fresh Reference Cell Buffer. The chamber holds 6 to 7 mL of solution.
MAKE SURE that 6 to 7 mL is used when refilling. The chamber should be FULL.
4.
Inspect the new saltbridge to verify that there are 2 o-rings inside the threaded section of the
saltbridge
5.
Place the new saltbridge over the ground assembly of the sensor. Place a cloth or towel
around the saltbridge and hand-tighten the saltbridge by turning it clockwise.
NOTE: Every ATI Q22P Sensor includes a spare bottle of Reference Buffer Solution, 7.0
pH. This is NOT typical pH 7 buffer, it is a special “high-capacity” buffer developed to
ensure the highest possible stability of the reference portion of the pH measurement. No
substitutions should be made.
