3
I
PHscan10/20
•
During the measurement, never wipe the pH-sensitive membrane
as this will cause static interference, blot dry with a lint-free tissue
to remove waterdrops on electrode.
•
Press the
key, the tester will lock the measurement, the HOLD
icon appears on the display. Press the key again to resume
measurement.
•
If the display shows ---- indicating the measurement exceeds the
range, remove the tester from the sample immediately.
Electrode
Maintenance and Replacement
Cleaning the Electrode
•
Since the pH-sensitive membrane is susceptible to contamination,
make sure that rinse the electrode thoroughly with distilled water
after use.
•
If your sample contains the oil or grease, soak the electrode in mild
detergent or electrode cleaning solution for at least 15 minutes,
then rinse with distilled water.
•
If you do not use the tester for a period longer than 1 month, store
the electrode in 3M KCl solution or electrode storage solution.
DO NOT store the electrode in distilled or deionized water, which
will deplete the hydration layer of the pH-sensitive membrane and
render the electrode useless.
Replacing the Electrode
If the tester fails to calibrate or gives fluctuating readings, you should
consider replacing the electrode.
1. Twist the electrode collar counter clockwise, pull the electrode
away from the tester.
2. Align the slot on the new electrode, gently push the electrode into
the tester.
3. Twist the electrode collar clockwise until tight.
Appendix
Preparation of pH Buffer Solutions
The PHscan10/20 tester is packaged with pH
4.01/7.00/10.01 buffer
sachets required for calibration.
1. Half fill a 250 ml volumetric flask with distilled water and add the
pH 7.00 buffer reagent.
2. Swirl the volumetric flask gently to dissolve the reagent and fill
to the mark with distilled water.
3. Cap and upend the volumetric flask several times to mix solution.
•
Preparation of pH 4.01 and 10.01 buffer solutions are the same as
above.
•
Prepared buffer solution should be stored in hermetically sealed
glass container and avoid direct sunlight.
Preparation of Electrode Storage Solution
Dissolve 24.6 grams of analytical grade KCl reagent in 100 ml distilled
water. Add pH 4.01 standard buffer and adjust solution to pH 4.
250 ml
