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.