Instruction Manual
HI8931A/B/C/D
HI8936A/B/C/D
HI8936AL/BL/CL/DL
HI943500A/B/C/D
Conductivity
Process Instrumentation
This Instrument is in Compliance with the CE Directives
WWW.HANNAINST.COM
Dear Customer,
Thank you for choosing a Hanna Instruments
Product.
Please read this instruction manual carefully 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 HI8931/HI 943500 . 5
Functional Description HI8936 ................. 9
Conductivity Probes ................................ 12
Specifications HI8931 & HI943500 ......... 14
Specifications HI8936 ............................. 15
Connections ............................................ 16
Operational Guide ................................... 24
Calibration Procedure of
HI8931 & HI8936 with HI7635................ 30
Calibration Procedure of
HI8931 & HI8936 with HI7638................ 34
Calibration Procedure of
HI943500 with HI7638 ............................ 38
Conductivity Versus
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
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 materials together with the supplied accessories.
GENERAL DESCRIPTION
The HI 8931 and HI 943500 are panel
mounted conductivity meters and controllers designed for simplicity of use in a wide
range of industrial process applications.
The instruments are designed with a standard DIN panel mount with membrane keypads on the front, a large LCD and with
auto-diagnostic functions.
Probes, power supply, contacts and recorders 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 sensor, provide temperature compensated conductivity measurements. The probe cable
length is 3 meters (10').
32
HI 943500 features a direct connection up
to 20 m (67'), without intermediate amplifiers, to the conductivity probe HI 7638 with
7-pin DIN connector and automatic temperature compensation.
Four models with different measurement
ranges are available to suit individual applications:
HI8931A / HI943500A
HI8936A / HI8936AL
from 0.0 to 199.9 mS/cm
HI8931B / HI943500B
HI 8936B / HI8936BL
from 0.00 to 19.99 mS/cm
FUNCTIONAL DESCRIPTION
HI 8931 & HI 943500
HI8931C / HI 943500C
HI 8936C / HI8936CL
from 0 to 1999 µS/cm
HI8931D / HI 943500D
HI 8936D / HI8936DL
from 0.0 to 199.9 µS/cm
Other features include: recorder output in 0
to 20 mA or 4 to 20 mA configuration; LED
indicators (for HI8931 and HI943500) which
identify whether the controller is in operation mode or selection mode.
Each instrument is supplied with a plastic
front cover and two mounting brackets.
Power cables are excluded.
Transmitters and conductivity probes are
supplied separately.
KEYPAD
MEASURE To read the measurement values
and to enable the diagnostic tests
∆∆
∆AL To display the set tolerance of
∆∆
the alarm
SET To set the working point
TEST SLOPE Diagnostic function
TEST OFFSET Diagnostic function
When each key is pressed the LED is lighted
indicating to the user that the function is in
operation.
TRIMMERS
OFFSET For offset calibration
SLOPE For slope calibration
∆∆
∆AL To set the alarm tolerance
∆∆
COARSE To coarsely adjust the working point
SET FINE To finely adjust the working point
LEDS
SET ON To show that the dosage is active
ALARM To show that the controller is in
alarm mode.
54
THE REAR PANEL OF HI 8931A/B/C/D
THE REAR PANEL OF HI 943500A/B/C/D
1. ALARM CONT Terminals for connection to an external alarm device
2. SET CONT Terminals (Max. 2A, 220V)
for connection to a dosing pump
3.4. +20V and COMM Terminals for connection to a conductivity transmitter
HI8936
5. SET SELECT Terminal for reverse control operation
6. 0-20/4-20mA Terminals for connection
to a recorder
7. Fuse Holder
8. Power Supply
9. IN/OUT TRANSMITTER Terminals for
connection to a conductivity transmitter.
Unplug the instrument from power
supply before the replacement of the
fuse.
1. Conductivity Probe Connector (7-pin DIN)
2. mA OUTPUT Terminals for connection
to a recorder
3. SET SELECT Terminal for reverse control operation
4. SET Terminals for connection to a dosing pump
5. ALARM Terminals for connection to an
external alarm device
6. Power Supply
7. Fuse Holder.
Unplug the instrument from power
supply before the replacement of the
fuse.
76
MECHANICAL DIMENSIONS
OF HI8931 AND HI 943500
Front view of the panel-mounted unit
FUNCTIONAL DESCRIPTION
HI 8936
69mm
2.71"
72mm
2.83"
141mm
5.55"
144mm
5.67"
These dimensions show the cutout size for the
installation.
Side view of the panel-mounted unit
144mm
5.67"
0.25/4mm
0.01/0.160"
ADJUSTABLE
LOCATION
BRACKET
HI 8936A
HI8936B
HI8936C
HI8936D
HI 8936AL
HI8936BL
HI8936CL
HI8936DL
135mm
5.31"
190mm MIN
7.50"
Adjustable location brackets (supplied with
the meter) allow the indicator to slide into the
cutout and will hold the unit securely in place.
190 mm (7.50") is the minimum amount of
room required to install the indicator with the
cables connected.
1. Back Cover
2. Top Plastic Cover
3. LCD Display (for HI8936AL, HI8936BL,
HI8936CL, HI8936DL only)
4. Screws for fastening the top cover.
98
SIDE VIEW
HI 8936A HI8936B HI8936C HI8936D
HI 8936AL HI8936BL HI8936CL HI8936DL
MECHANICAL DIMENSIONS
OF HI8936A, HI 8936B, HI8936C,
HI8936D
165mm
6.50"
100mm
3.94"
HI 8614
4 x 4.3mm
90mm
3.54"
4 x 0.17"
155mm
6.10"
MECHANICAL DIMENSIONS
OF HI8936AL, HI 8936BL, HI8936CL,
HI8936DL
110mm
4.33"
1. Top Plastic Cover
2. Wire cable glands.
90mm
3.54"
24mm
0.94"
45mm
1.77"
4 x 4.3mm
4 x 0.17"
165mm
6.50"
126mm
5.00"
58mm
2.28"
110mm
100mm
4.33"
3.94"
HI 8614L
155mm
6.10"
1110
CONDUCTIVITY PROBES
HI 7635 In-line Conductivity Probe
HI7635 is a one piece, molded conductivity
probe with pipe threads (1" NPT) at both
ends.
This allows the probe to attach to an in-line
system, and to be used in conjunction with
the HI8936 conductivity transmitter.
The HI7635 uses a 4-ring potentiometric
measuring method. This method is highly
accurate and requires very little maintenance.
The construction of the housing is rugged,
fiber-reinforced polypropylene.
The maximum working pressure of this unit
is 5 BAR (72.5psi).
Do not use in systems where the temperature exceeds 80°C (176°F).
HI7635
HI7638 Tank Conductivity Probe
HI7638 conductivity probe combines the
proven 4-ring potentiometric method of measuring conductivity with the platinum sensor
and stainless steel external thread.
This method incorporates a series of four
platinum rings into the probe shaft and is
highly accurate requiring very little maintenance.
The removable cover is made of Ultem
which resists the harmful effect of most
chemicals and can be unscrewed for quick
and simple maintenance.
This probe can withstand temperatures of
up to 120°C (248°F) and pressure of up to 5
bar (72.5 psi).
This probe is supplied complete with a 7-pin
DIN connector.
HI 7638
®
142mm
5.60"
73mm
2.87"
52mm
2.04"
1" NPT
1312
SPECIFICATIONS HI 8931 & HI 943500
SPECIFICATIONS HI 8936
Range
HI8931A - HI943500A
HI8931B - HI943500B
HI8931C - HI943500C
HI8931D - HI943500D
Accuracy
(@20°C/68°F)
Typical EMC
Deviation
4-20mA INPUT from
Transmitter
HI8931A
HI8931B
HI8931C
HI8931D
HI943500
Conductivity Probe
Calibration
Temperature
Compensation
HI8931
HI943500
Readout
Recorder Output
1 Set Point Relay
1 Alarm Relay
Power Supply
Panel Cutout
Environment
Weight
Enclosure
0.0 to 199.9 mS/cm
0.00 to 19.99 mS/cm
0 to 1999 µS/cm
0.0 to 199.9 µS/cm
±2% of Full Scale
excluding probe error
±2.5% of Full Scale
±0.4 mA
HI8936 A or AL (not included)
HI8936 B or BL (not included)
HI8936 C or CL (not included)
HI8936 D or DL (not included)
------
HI7635 for in-line applications or
HI7638 for tank (not included)
Manual 2-point through offset
and slope trimmers
See transmitter HI8936
Automatic from 0 to 60°C with
2% as temperature coefficient(β)
4-digit LCD plus graphic
symbols
0 to 20 mA or 4 to 20 mA (isolated)
Isolated, 2A, Max. 240V,
resistive load, 1,000,000 strokes
Isolated, 2A, Max. 240V,
resistive load, 1,000,000 strokes
110/115V or 220/240V
(user selectable); 50/60 Hz
141 x 69 mm (5.6 x 2.7")
-10 to 50°C (14 to 122°F)
1 Kg (2.2 lb.)
DIN 43 700 144x72 mm
(5.7x2.8") in black anodized
aluminum. Front and back with
shockproof ABS plastic and a
transparent cover.
Range
HI8936A & AL
HI8936B & BL
HI8936C & CL
HI8936D & DL
Accuracy
(@20°C/68°F)
Typical EMC
Deviation
Conductivity Probe
Calibration
Temperature
Compensation
Output
Power Supply
HI8936A/B/C/D
HI8936AL/BL/CL/DL
Protection
Environment
Dimensions
Weight
0.0 to 199.9 mS/cm
0.00 to 19.99 mS/cm
0 to 1999 µS/cm
0.0 to 199.9 µS/cm
±2% of Full Scale
excluding probe error
±2% of Full Scale
±0.4 mA
HI7635 for in-line applications or
HI7638 for tank
(not included)
Manual 2-point through Offset
and Slope trimmers
Fixed or automatic from 0 to
50°C (32 to 122°F) with 2% as
temperature coefficient (β)
4 to 20 mA not-isolated
Max. 500 ohm
12 to 30 VDC
17 to 36 VDC
IP 65
0 to 50°C (32 to 122°F)
95% RH max
165 x 110 x 90 mm (LxWxH)
(6.5 x 4.3 x 3.5")
1 Kg (2.2 lb.)
1514
CONNECTIONS
REAR CONNECTIONS FOR HI8931
• Power Connection Terminals
(4-screw terminal strip)
for connection to a 3wire power cable according to the indicated
voltage (115V or 230V).
• Set Select
These contacts permit
the activation of a Set
Contact relay when the
measured value is
lower (connected terminals) or higher (open
terminals) than the
user's set value. See
also page 27.
• Alarm Contacts
• IN/OUT Transmitter
2 wires of the 4-core signal cable from the
conductivity transmitter
(HI8936) have to be
connected to these terminals and the other 2
wires to the "+20V" and
"COMM" paying careful attention to the polarity.
+20V supply is the regulated DC supply
required for the operation of the external
Conductivity Transmitter HI8936.
• Set Contacts
Dosing pumps or other
control equipment may
be connected to the
"SET CONT" (Max. 2A,
220V) terminals. These
contacts act only as a
"dry" switch allowing
electrical continuity, not
as a power supply.
During normal operation these terminals remain open.
If the measured conductivity level is not
within the tolerance of
the set value, the alarm
contact is closed. These
contacts act only as a
switch.
See also page 28.
• +4-20 mA
These are the output
terminals for connec-
tion to a recorder or
other control equipment.
The output current varies from 4 to 20 mA
and is proportional to the measured conductivity value.
1716
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