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core cable from the
probe is connected to the
HI 8936 process conduc-
tivity
transmitter
shown. The connections are color coded
for an easy installation. See page 23 for
the proper connection scheme.
• It is recommended that the HI 7635 is in-
stalled vertically. This is to ensure that
trapped air bubbles or turbulent flows cause
minimal interference to the measurement
system. The maximum working pressure
of this unit is 5 BAR (72.5 psi).
CAUTION: do not use in systems where
temperature exceeds 80°C
(176°F).
• The HI7638 process conductivity probe is
also supplied with a 3 m (10')
length cable. The six core
cable from this probe is con-
nected to the HI 8936 pro-
cess conductivity transmitter
as shown.
The 7-pin DIN connector has to be re-
moved when this probe is used in con-
junction with HI 8936 transmitter.
See page 23 for the proper connection
scheme.
FOR HI 943500 ONLY
Ensure that the
HI7638 conductivity
probe is connected
to the meter se-
curely by aligning
the pins with the
socket, pushing the
plug in and tighten-
ing the threaded ring.
26
as
OPERATING INFORMATION
The various parameters are set through the
front panel keys and trimmers.
When each key is pressed the correspond-
ing LED is lit, indicating that the function is
operational.
Make sure that the conductivity meter, trans-
mitter & probe are calibrated before using
the instrument for measurements (see page
30 & 34 for HI 8931 & HI 8936 and page 38
for HI 943500).
SET POINT
To set the working point of the controller,
press the SET key. The display will indicate
the set value.
Use a small screw-
driver to adjust the
trimmers COARSE
and FINE until the
desired set value is
displayed.
Above set-point control operation
Leave the SET SELECT/
COMM. connectors open.
The set cont. relays will
close if the measured value
27
COMM.
SET
SET
SELECT
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