22
23
Inorganic
Soak in Hanna
HI 7074
Inorganic Cleaning Solu-
tion for 15 minutes.
Oil /grease
Rinse with Hanna
HI 7077
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
HI 7071
for single junction or
HI 7082
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.
9 VOLT BATTERY
SLIDE
HI 931000
HI 8014 - HI 8915
HI 8014
HI 8314
HI 8424
HI 8915
BATTERY
