13
°C
RANGE
ON/OFF
°C
°C
or
pH MEASUREMENTS
To take a pH measurement remove the elec-
trode protective cap and simply submerge the
tip (4cm/1½") of the electrode and the tem-
perature probe (wherever applicable) into the
sample to be tested.
Turn the instrument ON and if necessary, press RANGE until the
display changes to the pH mode.
Allow for the electrode to adjust to the solution and stabilize.
In order to take more accurate pH measurements, make sure that the
instrument is calibrated (see page 16).
It is recommended that the electrode is always kept wet and rinsed
thoroughly with the sample to be measured before use.
The pH reading is directly affected by temperature. In order for the
meter to measure the pH accurately, temperature must be taken in
consideration. If the sample temperature is quite different from the
temperature at which the pH electrode was kept, allow a few minutes
for a perfect thermal equilibrium between them.
HI 9023C, HI 9024C and HI 9025C:
To use the meter's Automatic Temperature Compensation feature,
submerge the temperature probe into the sample as close to the
electrode as possible and wait for a couple of minutes. If you know the
temperature of the sample to be tested you can manually compensate
for it.
If manual temperature compensation is desired the temperature
probe must be disconnected from the instrument.
The display will show the default temperature
of 25°C or the last recorded temperature read-
ing with the "°C" indicator blinking.
The temperature can now be adjusted with the
UP and DOWN keys.
4 cm
(1½")
28
CLEANING PROCEDURE
General Soak in Hanna HI 7061 or HI 8061 General Cleaning
Solution for approximately ½ hour.
Removal of films, dirt or deposits on the membrane/junction:
- Protein Soak in Hanna HI 7073 or HI 8073 Protein Cleaning
Solution for 15 minutes.
- Inorganic Soak in Hanna HI 7074 or HI 8074 Inorganic Clean-
ing Solution for 15 minutes.
- Oil/grease Rinse with Hanna HI 7077 or HI 8077 Oil and Fat
Cleaning Solution.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water, refill the reference cham-
ber with fresh electrolyte (not necessary for gel-filled electrodes) and
soak the electrode in HI 70300 or HI 80300 Storage Solution for at
least 1 hour before taking measurements.
TROUBLESHOOTING
Evaluate your electrode performance based on the following.
• Noise (Readings fluctuate up and down) could be due to:
– Clogged/Dirty Junction: Refer to the Cleaning Procedure above.
– Loss of shielding due to low electrolyte level (in refillable
electrodes only): refill with fresh HI 7071 or HI 8071 for single
junction or HI 7082 or HI 8082 for double junction electrodes.
• Dry Membrane/Junction: Soak in HI 70300 or HI 80300 Stor-
age Solution for at least 1 hour.
• Drifting: Soak the electrode tip in warm (approx. 50-60°C)
Hanna HI 7082 or HI 8082 Solutions for one hour and rinse the
tip with distilled water. Refill with fresh HI 7071 or HI 8071 for
single junction electrodes and HI 7082 or HI 8082 for double
junction electrodes (refillable electrodes only).
• Low Slope: Refer to the cleaning procedure above.
• No Slope: Check the electrode for cracks in glass stem or bulb
and replace the electrode.
• Slow Response/Excessive Drift: Soak the tip in HI 7061 or
HI 8061 Solutions for 30 minutes, rinse thoroughly in distilled
water and then follow the Cleaning Procedure above.
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