Electrode Conditioning And Maintenance - Hanna Instruments HI 9812 Instruction Manual

ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING
ELECTRODE CONDITIONING ELECTRODE CONDITIONING
A N D M A I N T E N A N C E A N D M A I N T E N A N C E A N D M A I N T E N A N C E A N D M A I N T E N A N C E A N D M A I N T E N A N C E
HI 1285 is a combined pH/EC/TDS electrode with built-in temperature sensor for EC/
TDS automatic temperature compensation. The probe screened cable is 1 m (3.3")
long.
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT.
This is normal with pH electrodes and they will disappear when rinsed
with water.
During transport tiny bubbles of air may have formed inside the glass
bulb. The pH electrode cannot function properly under these condi-
tions. These bubbles can be removed by "shaking down" the electrode
as you would do with a glass thermometer.
If the bulb and/or junction are dry, soak the electrode in HI 70300
Storage Solution for at least one hour.
TEST MEASUREMENT
Rinse the electrode tip with tap water.
Immerse the tip (bottom 4 cm / 1½") in the sample and stir gently for
approx. 30 seconds. Light tapping of the electrode on the bottom of
the beaker is sometimes necessary to eliminate air bubble trapped in
the electrode tip that could affect the EC/TDS reading.
For a faster response of the pH reading and to avoid cross contamina-
tion of the samples, rinse the electrode tip with the solution to be
tested, before taking your measurements.
STORAGE
When not in use, replace the protective cap.
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.
14