Aquametrix P/R60 Differential pH/ORP Sensors User Manual - Manual (Page 11)

P/R60 & P/R65 Page 11
4.2. Replacement of Salt Bridge for Series 4, 6, 7 & S Differential Probes
a) If the system cannot be calibrated after cleaning the probe, it may be necessary to replace the
standard cell solution. A kit is available from Water Analytics for this purpose (Part No. C35-17K).
Proceed as follows: Refer to DWG N106-60.
b) Hold the probe vertically with the sensor face up. Insert long nose pliers in the blind holes in the salt
bridge and turn counter-clockwise taking care not to damage the glass electrode. Discard the used
salt bridge.
c) Up-end the probe and pour out the contents of the standard electrode chamber. Flush the chamber
with a small amount of pH 7 buffer or clean water.
d) Refill the chamber with 7pH buffer solution up to the tip of the electrode inside the chamber. DO
NOT OVERFILL. It is important to leave space for the salt bridge thread and a small amount of air.
e) Screw the new salt bridge into the cavity until finger tight. Now turn 1/4 turn with long nose pliers.
The front face of the salt bridge should be flush with the probe face.
4.3. Replacement of Salt Bridge for Series 8 Differential Probes
a) If the system can’t be calibrated after cleaning the probe, it may be necessary to replace the
standard cell solution. A kit is available from Water Analytics for this purpose (Part No. AM60-
9765K). Proceed as follows: Refer to DWG N106-60.
b) Hold the probe vertically electrodes up. Remove the used salt bridge using a 9/16” socket wrench,
turning counter-clockwise. Discard the used salt bridge.
c) Dispose of the used solution inside the bridge chamber and flush with pH 7 solution or distilled
water.
d) Refill the chamber with 7pH buffer solution, up to the tip of the electrode, inside the chamber. DO
NOT OVERFILL. It is important to leave space for the salt bridge thread and a small amount of air.
e) Screw the new salt bridge into the cavity until finger tight. Now perform a 1/4 turn with a 9/16”
socket wrench. The salt bridge edges should be flush with the front of the probe face.
4.4. Storage
a) Do not discard the protective cap(s) that came with the sensor. If the sensor is removed from the
process for an extended period of time, thoroughly clean the sensor, put a piece of cotton ball with
few drops of water into the protective cap and replace it on the sensor. This keeps the junction from
drying out which causes slow response when put back into operation or causes permanent damage
to the sensor. Sensors should not be left in dry lines or empty tanks for extended periods.
b) Do not store the sensors in a dry or humid location. When storing, check the protective cap(s)
regularly to make sure the cotton ball remains moist. Improper storage of sensors voids the
warranty.