22 23
Inorganic Soak in Hanna HI 7074 Inorganic Cleaning Solu-
tion for 15 minutes.
Oil/grease Rinse with Hanna HI7077 Oil and Fat Cleaning
Solution.
IMPORTANT: After performing any of the above cleaning procedures
rinse the electrode thoroughly with distilled water, drain and refill the
reference chamber with fresh electrolyte (not necessary for gel-filled
electrodes), and soak the electrode in HI70300 Storage Solution for
at least 1 hour before taking any measurement.
TROUBLESHOOTING
Evaluate the electrode performance based on the following.
• Noise (Readings fluctuate up and down) could be due to:
- Clogged/Dirty Junction: Refer to above Cleaning Procedure.
- Loss of shielding due to low electrolyte level (in refillable
electrodes only): refill with HI7071 for single junction or
HI7082 for double junction electrodes.
• Dry Membrane/Junction: Soak in Storage Solution HI70300 for
at least 1 hour.
• Drifting: Soak the electrode tip in warm Hanna Solution HI7082
for one hour and rinse tip with distilled water (refill with fresh
HI7071 for single junction electrodes and HI7082 for double
junction electrodes if necessary).
• Low Slope: Refer to the cleaning procedure above.
• No Slope: - Check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found).
- Make sure cable and connections are not dam-
aged nor lying in a pool of water or solution.
• Slow Response/Excessive Drift: Soak the tip in Hanna Solu-
tion HI7061 for 30 minutes, rinse thoroughly in distilled water
and then follow the Cleaning Procedure above.
• For ORP Electrodes: polish the metal tip with a lightly abrasive
paper (paying attention not to scratch the surface) and wash
thoroughly with water.
Note: For field applications, it is always recommended to keep a
spare electrode handy. When anomalies are not resolved with
a simple maintenance, change the electrode (and recalibrate
the meter) to see if the problem is alleviated.
BATTERY REPLACEMENT
All meters are powered by a 9V battery that is located on the rear of
the instrument.
The meters provide the following, when the battery becomes weak:
- HI 8014, reaching a certain minimum threshold, automatically
switches the LCD off.
- HI 8915 flashes an additional decimal point
on the bottom left hand side of the LCD.
- HI 931000 displays the "Eb" message.
When the low battery indicator appears only a few hours of battery
life is remaining. Since a low voltage may also result in loss of
calibration data or unreliable measurements, it is recommended to
replace the battery immediately.
Replacement must only take place in a non-hazardous area using an
alkaline 9V battery.
To access the battery, remove the battery cover by applying pressure
in the direction indicated below. Replace the old battery with a new
one, while paying attention to its polarity.
Note: The instrument should be recalibrated after changing the
battery.
9VOLTBATTERY
SLIDE
HI 931000HI 8014 - HI 8915
HI 8014
HI 8314
HI 8424
HI 8915
BATTERY
