21
20
REAR CONNECTIONS FOR HI 943500
• Power Connection Terminals
(4-screw terminal
strip) for connection to
a 3-wire power cable
according to the indi-
cated voltage (115V
or 230V).
• 7-pin DIN connector socket
For connection
to the HI 7638
c o n d u c t i v i t y
probe.
• + mA output -
The first and the second terminals are the
output terminals for connection to a re-
corder or other control equipment. The
output current varies from 0 to 20 mA or
from 4 to 20 mA, depending on model,
and is propor-
tional to the mea-
sured conductivity
value.
• Set Select
These contacts
permit the activa-
tion of the Set
Contact relay
when the measured value is lower (closed
terminals) or higher (open terminals) than
the user's set value. See also page 27.
•
Use of an amplifier
The maximum permissible distance be-
tween the power supply unit and the am-
plifier is 300 m (1000'). It is not necessary
to use a shielded cable.
•
Probe Connection
The conductivity probe
is supplied with a 3 m
(10'), 6 core cable. The
cable is to be con-
nected to the terminals
provided (see also
page 23 for proper con-
nection scheme of
HI 7635 and HI 7638).
