User Guide

30
Troubleshooting
Evaluate the electrode performance based on the following:
• Noise (readings fluctuate up and down) could be due to clogged/dirty
junction:
- Dry Membrane/Junction: soak in HI 70300 Storage Solution overnight.
Check that the installation has been done to create a well to maintain
the electrode bulb constantly moist.
• Low Slope:
- Check the electrode for cracks in the glass stem or bulb (replace the
electrode if cracks are found).
- Make sure that cable and connections are neither damaged nor lying
in a pool of water or solution.
• Slow Response/Excessive Drift:
- Soak the tip in HI 7061 Solution for 30 minutes, rinse thoroughly with
distilled water and then recalibrate the meter.
Note: It is always recommended to keep at least one spare electrode
handy. When anomalies are not resolved with a simple mainte-
nance, change the electrode (and recalibrate the controller) to see
if the problem is solved.