Hanna Instruments HI 9835 - Manual (Page 8)

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PROBE MAINTENANCE
After measurements, rinse the probe with clean water. If a more
thorough cleaning is required, remove the probe sleeve and clean the
probe with a cloth or a nonabrasive detergent.
Make sure to reinsert the sleeve onto the probe properly and in the
right direction.
After cleaning the probe, recalibrate the instrument.
When the batteries are inserted and no power adapter is connected,
the meter can recognize the following battery charge levels:
• Low battery - "LOBAT" indication is displayed on the LCD.
Backlight is automatically disabled and it is not possible to
enable it until new batteries are inserted or an external power
adapter is used. When "LOBAT" appears, batteries have typically
10% of their life left and the meter is still measuring properly.
• Very weak battery - The meter shuts off to avoid erroneous
operations.
Note: If the meter is not powered for several minutes (e.g. in dead
battery condition), the current date and time are lost.
Battery replacement must only take place in a safe area and using
1.5V alkaline AA type batteries.
In order to replace run down batteries, simply
remove the two screws on the rear cover of the
instrument and replace the four 1.5V AA bat-
teries with new ones, paying attention to the
correct polarity.
New batteries allow approximately 150 hours of continuous use.
A 12 Vdc power adapter can also be used.
It is recommended to use the HANNA volt-
age adapters that provide the proper polarity
configuration.
However, other adapters can be used. In this case, check the polarity
of the adapter before connecting it to the meter.
BATTERY REPLACEMENT
The following table lists the setup items, their valid range of values
and the factory settings (default):
Item Description Valid values Default
tc Temp. compensation coeff. 0.00 to 6.00 %/°C 1.90
tcE Temp. compensation mode Atc, Mtc, notc Atc
tdS TDS factor 0.40 to 0.80 0.50
CEL Cell constant (K) 0.500 to 1.700 1.000
Aof Auto-off enable On, OFF On
vEr Firmware release
Chr Battery level test
Notes
I Once enabled, the Auto-off time is fixed at 5 minutes.
II When the battery level test is selected (Chr), the LCD will display
the remaining percentage of battery charge. 100% means fully
charged battery and 0% corresponds to the minimum battery
level that allows the meter to operate.
The battery charge level calculation is based on a typical
alkaline battery discharge curve.
If the meter is connected to an external power adapter and
"Chr" is selected, the LCD will display "LINE".