Hanna Instruments HI 8711 - Manual (Page 40)

40
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 obtain a insulation level not
lower than 10
12 ohm.
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 of regular cable up to 50 m (165'), can be installed
without special connectors.
AmpHel
® electrodes feature a built-in a micro-amplifier to boost the
signal, drastically reducing susceptibility to noise and drift.
The sealed electrode body can stand a moisture up to 100% RH
without any effect on the signal.
AmpHel ® is a registered Trademark of "Hanna Instruments"
SUGGESTED INSTALLATIONS SUGGESTED INSTALLATIONS SUGGESTED INSTALLATIONS SUGGESTED INSTALLATIONS SUGGESTED INSTALLATIONS