Maintenance
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5.2.1 Maintain the conductivity cup
Rinse the conductivity cup with clean water after taking measurements to prevent
buildup on the electrodes. Do not scrub the cup. For oily films, add a few drops of
foaming, non-abrasive cleaner or isopropyl alcohol, then rinse.
Note: When sampling low-conductivity solutions, make sure the pH/ORP sensor cap is
well-seated so that solution does not wash from the pH/ORP sensor cup into the conductivity
cup.
5.2.2 Maintain the pH/ORP sensor cup
Keep the pH/ORP sensor cup hydrated with Hach pH Storage Solution. Before
replacing the pH/ORP sensor cap, rinse and fill the sensor cup with the storage
solution. Never use distilled water to store the sensor cup.
5.3 pH/ORP sensor replacement
Complete installation instructions are included with each replacement sensor. Tools
required include a #2 Phillips screwdriver and 1/4-inch wrench.
Note: When the pH/ORP sensor is replaced, it is also a good time to replace the battery.
5.4 Clean the sensors
Perform these procedures to clean the various sensors.
5.4.1 Clean the conductivity/resistivity/TDS sensor
Keep the conductivity cell cup (Figure 7) as clean as possible.
Note: Flush with clean water after use to prevent buildup on electrodes.
When a dirty sample is left in the cup, a film forms. This film reduces accuracy.
To clean a visible film of oil, dirt or scale that is in the cell cup or on the electrode:
1. Use isopropyl alcohol or a foaming, non-abrasive household cleaner. Hach
acid electrode cleaning solution may also be used less frequently.
2. Pour any of these solutions in the cell cup and allow it to soak for no more than
five minutes.
3. Use a cotton swab to gently clean the electrodes.
4. Rinse out the cleaning solution.
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