Hanna Instruments HI 9813-5 Instruction Manual page 13

CLEANING PROCEDURE
For better accuracy in measurements and to ensure a good performance
of the probe, a frequent cleaning is recommended.
For this purpose, soak it in Hanna HI 700661 Cleaning Solution for
5 minutes.
Note: For particular dirty (as for example protein, oil or grease) see
the "Accessories" section for Hanna specific solutions.
HI 9813-6 only:
CAL-CHECK FEATURE / CLEAN & CAL PROCEDURE
TM
The unique Cal-Check feature allows the user to check the meter
TM
calibration status at any time. Simply follow the below procedure for
a quick and easy operation.
• Rinse the probe with water.
• Immerse the probe in the HI 50021 check solution.
Note: If the reading is around pH 4.0, the probe is broken and has
to be replaced.
• Press the Check key.
• If the meter is calibrated "Probe is
OK" message is displayed.
• If cleaning is needed "Clean Probe
and Calibrate" message is displayed:
1. immerse the probe in the
HI 700661 cleaning solution (or
in one of the available specific
solutions - see "Accessories" section)
for 5 minutes, then rinse it with tap water.
2. immerse again in the HI 50021 check solution and press the
CHECK key.
3. if the message "Probe is OK" is displayed, the meter does not
need calibration.
4. if the message "Clean Probe and Calibrate" is displayed
again, calibration is needed (see "pH Calibration" section).
Notes: • If it is not possible to calibrate, the probe has to be
replaced with a new one.
• For field applications, it is always recommended to keep a
spare probe handy. When anomalies are not resolved with
simple maintenance, change the probe and recalibrate
the meter.
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