Troubleshooting
Evaluate your probe performance based on the following.
• Noise (Readings fluctuate up and down) could be due to clogged or dirty junction: refer to the
Cleaning Procedure above.
• Dry Membrane/Junction: soak in Storage Solution HI70300 for at least 1 hour. Check to make
sure the installation is such as to create a well for the probe bulb to constantly remain moist.
• Drifting: soak the probe tip in warm Hanna Instruments Solution HI7082 for one hour and rinse
tip with distilled water.
• Low Slope: refer to the cleaning procedure above.
• No Slope:
- Check the probe for cracks in glass stem or bulb (replace the probe if cracks are found).
- Make sure cable and connections are not damaged.
• Slow Response/Excessive Drift: soak the tip in Hanna Instruments Solution HI7061 for 30 minutes,
rinse thoroughly in distilled water and then follow the Cleaning Procedure above.
• For ORP probe: polish the metal tip with a lightly abrasive paper (paying attention not to scratch
the surface) and wash thoroughly with water.
MAINTENANCE
CHANGING PERISTALTIC PUMP TUBING
It is recommended that the peristaltic pump tubes be changed on a regular basis depending on
sampling period and operating time.
For a 5 minutes sample interval and continuous operation, changing of the tubes every month is
recommended. For best results however, change the tubings every time the reagents are replaced.
Note: Rubber gloves and eye protection must be worn while handling reagent tubing to prevent
contact with reagent chemicals. Read MSDS documents before proceeding.
Grasp the plastic collar of one pump tube and pull the fitting away from the pump toward the
front of the case until it clears the retaining indentation.
Then move the fitting sideways away from the pump until the tube clears the slot.
Release the tube and fitting. The fitting on the other end of the pump tube may now be easily
removed from the pump body.
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