14
°C
RANGE
pH
°C
SET
HI 9023C, HI 9023CN and HI 9210N
To use the meter's Automatic Temperature Compensation feature,
simply submerge the pH/°C electrode into the sample and wait for a
couple of minutes. The pH electrode also houses the temperature
sensor which will measure and adjust for the temperature effect
automatically.
HI 9110, HI 9210:
To use the meter’s Manual Temperature Compensation feature:
Press the pH/°C key of HI 9110 or the RANGE key of HI 9210 to
select the manual temperature mode.
Remove the protective cap on top of the meter
to access the trimmers. Measure the tempera-
ture of the buffer with a Checktemp or an
accurate thermometer.
Using the calibration screwdriver, turn the tem-
perature trimmer (#5 pages 9-10) to display
the measured temperature value.
Press the pH/°C key of HI 9110 or the RANGE key of HI 9210 to
return to the pH measurement mode.
When finished, switch the instrument off and rinse the electrode with
clean water. Pour a few drops of HI 70300 storage solution, or in its
absence, pH 7 or pH 4 buffers in the protective cap and replace it
before storing away the electrode.
RANGE
pH
°C
SET
27
For refillable electrodes:
If the filling solution (electrolyte) is more than 2½ cm (1") below the
fill hole, add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for
double junction or HI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte
Solution for single junction electrodes.
For a faster response, unscrew the fill hole screw during measure-
ments.
For AmpHel
®
electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
MEASUREMENT
Rinse the electrode tip with distilled water. Immerse the tip (bottom 4
cm /1½") in the sample and stir gently for a few seconds.
For a faster response and to avoid cross contamination of the samples,
rinse the electrode tip with a few drops of the solution to be tested,
before taking measurements.
STORAGE
To minimize clogging and assure a quick response time, the glass bulb
and the junction should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of HI 70300
or HI 80300 Storage Solution or, in its absence, Filling Solution
(HI 7071 or HI 8071 for single junction or HI 7082 or HI 8082 for
double junction electrodes). Follow the Preparation Procedure above
before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WA-
TER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to
the meter must be intact and there must be no points of broken
insulation on the cable or cracks on the electrode stem or bulb.
Connectors must be perfectly clean and dry. If any scratches or cracks
are present, replace the electrode. Rinse off any salt deposits with
water.
For refillable electrodes:
Refill the reference chamber with fresh electrolyte (HI 7071 or HI 8071
for single junction or HI 7082 or HI 8082 for double junction elec-
trodes). Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.
AmpHel
®
is a registered Trademark of "Hanna Instruments"
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