After measuring concentrated acids (pH < 2) or strong alkali solutions(pH >12).
After measuring solutions containing fluoride, acid (pH< 7) and concentrated
organic solutions.
Maintenance
The compound sensitive electrode should be kept clean at all times. Do not
unplug the electrode plug frequently to avoid dust and extra moisture from
entering the unit.
Make sure the glass ball of the sensitive PH compound electrode doesn’t touch
any hard objects.
The electrode must not touch dirt. If it does, please wipe it gently with medical
cotton or rinse it with a 0.1 MOL/L HCL solution.
For the best, most accurate results, please replace the electrode if there is crack or
burn-in. The new electrode should be immersed in 3 MOL/L KCL solution for 24
hours before using.
When making a standard buffer solution, make sure to keep it clean the whole
time for the best, most accurate results. For information on how to make a
standard buffer solution, please refer to appendix 1.
Appendix 1 Making up standard buffer solution
The Dr. Meter PH Meter comes with 3 buffer solutions for calibration: 4.00, 6.86, and
9.18.
Make up each solution in a separate container (or bottle) by adding the contents
of each sachet to 250ml distilled water.
Wait 30 min for it to dissolve thoroughly.
Mark each bottle with the labels---pH4.00, pH6.86, and pH9.18.
Precautions
Please choose the standard buffer solution that is closest to the PH value of the
test solution for the most accurate measurement results.
After taking off the protective cap, make sure the glass ball of the sensitive PH
compound electrode doesn’t touch any hard objects. Please put the protective cap
on after using.
Make sure there is 3.3 MOL/L KCL solution available for the glass ball of the
sensitive PH compound electrode under humid conditions.
For the best and most accurate results, please keep the electrode outlet dry and
clean.
Do not immerse the electrode in distilled water, protein solution, or acid fluoride
solution for long periods of time.
The electrode must not come into contact with silicone grease.
To renew the electrode, immerse it in a 4% HF solution for 3 ~ 5 seconds; then
rinse it with distilled water and soak it in a KCL solution.
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