Hanna Instruments HI 9813-5 - Manual (Page 13)

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 TM FEATURE / CLEAN & CAL PROCEDURE
The unique Cal-Check TM feature allows the user to check the meter
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.