Hanna Instruments PCA 310 - Manual (Page 67)

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Cleaning procedure
General Soak in Hanna HI 7061 General Cleaning
Solution for approximately ½ hour.
Removal of films, dirt or deposits on the membrane/junction:
Protein
Soak in Hanna HI 7073 Protein Cleaning
Solution for 15 minutes.
Inorganic Soak in Hanna HI 7074 Inorganic Cleaning
Solution for 15 minutes.
Oil/grease Rinse with Hanna HI 7077 Oil and Fat
Cleaning Solution.
IMPORTANT: After performing any of the cleaning procedures rinse the
probe thoroughly with distilled water and soak the electrode in
HI 70300 Storage Solution for at least 1 hour before
reinstalling it.
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 HI 70300
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 Solution HI
7082 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 Solu-
tion HI 7061 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.