Hanna Instruments HI 9813-5, Instruction Manual, Page: 13 / 16

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 Instruments
HI700661 Cleaning
Solution for 5 minutes.
Note : For particular dirt (as for example protein, oil or grease) see the
“Accessories” section for Hanna Instruments specific solutions.
HI9813-6 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
HI50021 check solution.
Note : If the reading is around pH4.0, 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 HI700661
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 HI50021 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.