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(Optional) If the process water is near the boiling temperature, add gel powder to the new
standard cell solution at illustrated step 4 as follows:
a. Pour 1 level bottle cap (⅛ teaspoon) of gel powder into the reservoir for the standard cell
solution.
b. Pour a small amount of fresh standard cell solution into the reservoir.
c. Mix with the powder until the solution becomes thick.
d. Add small amounts of solution and mix until the gel level is at the bottom of the salt bridge
threads.
e. Check for proper gel level by installing and removing the new salt bridge. A salt bridge
impression should remain on the gel surface.
3. Calibrate the sensor.
English 17
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