21
20
If the calibration buffer is not 4,7,10 but
another value, such as 7.01, just press
„
„ to change the value.
6. The adjustable cal. point range for 4.0 pH
is from 3.50 to 4.50. For 7.0 pH is from 6.50
to 7.50. For 10.0 pH is from 9.50 to 10.50
7. To save the calibration value:
When the electrode reads a stable value
and user stops pressing any keys,
the meter will automatically save the value
and then escape the calibration mode.
8. Rinse the probe with de-ionized water or a
rinse solution (tap water...) after each
measurement to last the meter‘s life.
9. Repeat above steps until the 3 point
calibration are finished.
MAINTENANCE
Please always keep the pH glass bulb wet by
using the storage bottle to protect and store
the electrode.
Always rinse the pH electrode in de-ionized
water or rinse solution (tap water......) before
next use.
Never touch or rub glass bulb in order to last
pH electrode life.
Make sure the electrode is clean. Between
measurements, rinse the electrode with
deionised water. If the eletrode has been
exposed to a solvent immiscible with water,
clean it with a solvent miscible with water e.g.
ethanol or acetone and rinse carefully with
water.
Store the electrode carefully.
TROUBLESHOOTING
Power on but no display
1) Make sure the time of pressing
power key is more than 100 mS.
2) Check the battery are in place and
make good contact and correct polarity.
3) Replace with new batteries and try
again.
4) Move away the batteries for one minute
and then put back again.
Slow response
Clean probe by immersing the electrode
in tap water for 10-15 minutes, then rinse
thoroughly with distilled water or use a
general purpose electrode cleaner.
LCD display “ - - - “
Out of pH range,
too acidic/or too alkaline.
„H.“ or „L.“
Out of temp. range,
too cold/or too hot.
pH value fluctuate quickly
It is normal when the electrode is not
immersed in the water but exposed in air.
