Hanna Instruments HI 943500A - Manual (Page 11)

21 20
• Probe Connection
The conductivity probe is supplied
with a 3 m (10'), 6 core cable.
The cable is to be connected to the
terminals provided (see also page
24 for proper connection scheme of
HI 7635 and HI 7638).
The 4-core cable has to be con-
nected to the transmitter accord-
ing to the label instructions on the
4-terminal strip.
The regulated D.C. supply required for the proper operation of the
transmitter is "+20 V", labeled "+20 V" and "COM". The current
(mA) output terminals are labeled "4-20 mA" and "COM".
The transmitter is protected against inversion of supply voltage.
• HI 8936 used in conjunction with an external power supply
Use 2 PVC insulated 2-core cables.
Connect a +20 Vdc power supply
directly to the terminals labeled
"+20 V" and "COM", paying care-
ful attention to polarity (see also
page 24) or if necessary in series
with the receiving device.
The regulated DC supply required for the proper functioning of the
circuit is marked "+20 V" and "COM", and the transmitter current
output is indicated "4-20 mA" and "COM".
The transmitter is protected against inversion of supply voltage.
Max. current required: 40 mA.
• Use of an amplifier
The maximum permissible distance between the power supply unit
and the amplifier is 300 m (1000'). It is not necessary to use a
shielded cable.