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Dear Customer,
Thank you for choosing a Hanna Instruments
Product.
Please read this instruction manual care-
fully before using the instrument.
This manual will provide you with all the
necessary information for the correct use of
the instrument, as well as a precise idea of
its versatility in a wide range of applications.
These instruments are in compliance with
the
directives EN 50081-1 and EN 50082-
1.
TABLE OF CONTENTS
Preliminary Examination ........................... 3
General Description .................................. 3
Functional Description HI8936 ................. 9
Conductivity Probes ................................ 12
Specifications HI8931 & HI943500 ......... 14
Specifications HI8936 ............................. 15
Connections ............................................ 16
Operational Guide ................................... 24
HI8931 & HI8936 with HI7635 ................ 30
HI8931 & HI8936 with HI7638 ................ 34
HI943500 with HI7638 ............................ 38
Temperature Chart ................................. 41
Diagnostic Tests ..................................... 42
Installation Examples .............................. 44
Probe Maintenance and Cleaning .......... 46
Accessories ............................................. 47
Warranty ................................................. 50
CE Declaration of Conformity ................ 51
ISO 9000 Certified
Company since 1992
2
PRELIMINARY EXAMINATION
Remove the instrument from the packing
material and examine it carefully to make
sure that no damage has occurred during
shipping. If there is any noticeable damage,
notify your Dealer.
Note: Save all packing materials until you
are sure that the instrument functions
correctly. All defective items must be
returned in the original packing ma-
terials together with the supplied ac-
cessories.
GENERAL DESCRIPTION
The HI 8931 and HI 943500 are panel
mounted conductivity meters and control-
lers designed for simplicity of use in a wide
range of industrial process applications.
The instruments are designed with a stan-
dard DIN panel mount with membrane key-
pads on the front, a large LCD and with
auto-diagnostic functions.
Probes, power supply, contacts and record-
ers are connected on the rear panel through
screw terminals.
Using HI 8931 in conjunction with a 4-20 mA
output transmitter HI 8936 series (or HI 8936L
series, with LCD display) will assure you of
a strong, interference-free signal at distances
up to 300 meters (1000').
For in-line applications the probe should be
HI 7635 and for tanks HI 7638 with external
threads. These probes with built-in NTC sen-
sor, provide temperature compensated con-
ductivity measurements. The probe cable
length is 3 meters (10').
3
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