Hanna Instruments HI 8510 - Manual (Page 24)

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SUGGESTED INSTALLATIONS
SHORT DISTANCE, INDOOR INSTALLATION
Due to the low current involved, a very high
grade of insulation is required.
A dry environment is needed in order to ob-
tain a insulation level not lower than 10
12 Ω .
This type of connection is very delicate and
requires constant attention to maintain proper
operating conditions.
Conventional electrodes should be used in
indoor applications only, with a cable not
longer than 10 m (33').
MEDIUM DISTANCE, INDOOR/OUTDOOR
INSTALLATION
When an outdoor installation is required, to
obtain accurate readings at distances from
10 to 50 m (33-165'), it is necessary to
install a transmitter.
Since the introduction of AmpHel
® electrodes,
these distances are no longer a problem.
You can now connect the meter directly to
an AmpHel
® electrode, saving the cost of a
transmitter or expensive coaxial cable.
The standard cable length for AmpHel
®
electrodes is 5 m (16.5'). Additional lengths
TROUBLESHOOTING
Evaluate your electrode performance based
on the following:
• Noise (readings fluctuate up and down)
could be due to:
- Clogged/Dirty Junction: refer to the
above "Cleaning Procedure"
- Loss of shielding due to low electrolyte
level (in refillable electrodes only): refill
with HI 7071 solution for single junction
or HI 7082 for double junction electrodes
• Dry Membrane/Junction: soak in HI70300
storage solution for at least 1 hour
• Drifting: soak the electrode tip in warm
HI7082 solution for one hour and rinse the
tip with distilled water; refill with fresh
electrolyte (HI 7071 for single junction and
HI 7082 for double junction electrodes)
• Low Slope: refer to the above "Cleaning
Procedure"
• No Slope: check the electrode for cracks
in glass stem or bulb (replace the elec-
trode if cracks are found)
• Slow Response/Excessive Drift: soak the
tip in HI 7061 solution for 30 minutes,
rinse thoroughly in distilled water and then
follow the above "Cleaning Procedure"
• For ORP Electrodes: polish the metal tip
with a light abrasive paper (pay attention
not to scratch the surface) and rinse
thoroughly with water
pH METER
WITH CONVENTIONAL ELECTRODES
MEASUREMENTS CAN BE
TAKEN FROM DISTANCES UP TO
10 METERS (33 FEET)
DRY ENVIRONMENT
LESS THAN 80%
RELATIVE HUMIDITY
MAXIMUM 10 METERS
pH-ORP METER