User Guide

17
FUNCTIONAL DESCRIPTION HI 9622
1) BNC socket for combination pH or ORP electrode.
2) Liquid Crystal display (LCD).
3) RANGE to select the pH, °C or mV range.
4) UP arrow to set the month and day for calibration data
recall and the temperature for manual compensation (when
temperature probe is disconnected).
5) CAL to enter calibration mode.
6) Socket for temperature probe HI 7669/2W.
7) ON/OFF to switch the instrument on or off.
8) DOWN arrow to set the month and day for calibration data
recall and the temperature for manual compensation (when
temperature probe is disconnected).
9) CFM to confirm calibration data.
40
If the bulb and/or junction are dry, soak the electrode in HI 70300
Storage Solution for at least one hour.
For refillable electrodes:
If the refill solution (electrolyte) is more than 2½ cm (1") below the fill
hole, add HI 7082 3.5M KCl Electrolyte Solution for double junction or
HI 7071 3.5M KCl+AgCl Electrolyte Solution for single junction
electrodes.
For AmpHel
®
electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
TEST MEASUREMENT
Rinse the electrode tip with distilled water.
Immerse the tip (bottom 4 cm / 1½") in the sample and stir gently
for approx. 30 seconds.
For a faster response and to avoid cross contamination of the samples,
rinse the electrode tip with the solution to be tested, before taking
your 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.
When not in use, replace the solution in the protective cap with a few
drops of HI 70300 Storage Solution or, in its absence, HI 7007
pH 7.01 Buffer Solution.
Follow the Preparation Procedure above before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED
WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for the 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 electrode with fresh electrolyte (HI 7071 for single junction or
HI 7082 for double junction electrodes). Allow the electrode to stand
upright for 1 hour. Follow the Storage Procedure above.
AmpHel
®
is a registered Trademark of "Hanna Instruments"