Owner manual

P/R60 & P/R65 Page 9
4.2 Replacement of Salt Bridge for Series 4, 6, 7 & S Differential Probes
4.2.1 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 AquaMetrix 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
4.3.1 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 AquaMetrix 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
4.4.1 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.
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.