Hanna Instruments HI 8931 User manual

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Instruction ManualInstruction Manual
Instruction ManualInstruction Manual
Instruction Manual
HH
HH
HII
II
I8931 • H8931 • H
8931 • H8931 • H
8931 • HII
II
I8936 Series8936 Series
8936 Series8936 Series
8936 Series
Conductivity PConductivity P
Conductivity PConductivity P
Conductivity Processrocess
rocessrocess
rocess
Controllers and TControllers and T
Controllers and TControllers and T
Controllers and Transmittersransmitters
ransmittersransmitters
ransmitters
www.hannainst.comwww.hannainst.com
www.hannainst.comwww.hannainst.com
www.hannainst.com

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Dear Customer,
Thank you for choosing a HANNA instruments®product.
Please read this instruction manual carefully before using the instru-
ment.
This manual will provide you with all the necessary information for
correct use of the instruments, as well as a precise idea of thier
versatility in a wide range of applications.
If you need additional technical information, do not hesitate to e-mail
us at [email protected][email protected]
[email protected][email protected]
[email protected]
These instruments are in compliance with the directives.
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
Preliminary Examination ............................................................. 3
General Description .................................................................... 3
Functional Description HI 8931 ................................................... 5
Functional Description HI 8936 ................................................... 8
Conductivity Probes .................................................................. 11
Specifications HI 8931 ............................................................. 13
Specifications HI 8936 ............................................................. 14
Connections ............................................................................. 15
Operational Guide .................................................................... 22
Calibration Procedure of HI 8931 & HI 8936 with HI 7635 .......... 28
Calibration Procedure of HI 8931 & HI 8936 with HI 7638 .......... 32
Calibration Procedure of HI 8931 with HI 7638........................... 36
Conductivity Versus Temperature Chart........................................ 38
Diagnostic Tests ....................................................................... 39
Installation Examples ............................................................... 41
Probe Maintenance and Cleaning ............................................... 43
Accessories .............................................................................. 44
Warranty ................................................................................. 46

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PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
Remove the instrument from the packing material and examine it care-
fully to make sure that no damage has occurred during shipping. If there
is any noticeable damage, notify your dealer.
Each model is supplied complete with:
• Mounting brackets (not for HI 8936 series)
• Transparent splsh-proof cover (not for HI 8936 series)
• Instruction manual
Note::::: Save all packing materials until you are sure that the instru-
ment functions correctly. All defective items must be returned
in the original packing materials together with the supplied
accessories.
HI 8931 is a panel-mounted conductivity controller designed for sim-
plicity of use in a wide range of industrial process applications.
The instruments are designed with a standard DIN panel mount with
membrane keypads and large LCD with backlight on the front, and pro-
vide a series of 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 or HI 8936L series) will assure you of a strong, interference-
free signal at distances up to 300 meters (1000').
For in-line applications use the HI 7635 probe, while for tanks the
HI 7638 with external threads is recommended. These probes are pro-
vided with built-in NTC sensor for temperature compensated conductivity
measurements. The probe cable length is 3 meters (10').
HI 8931 also features a direct connection up to 20 m (67'), without
intermediate amplifiers, to the conductivity probe HI 7638 with DIN con-
nector and automatic temperature compensation.

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Four models with different measurement ranges are available to suit
any application needs:
•HI8931A / HI8936A / HI 8936AL from 0.0 to 199.9 mS/cm
•HI8931B / HI 8936B / HI 8936BL from 0.00 to 19.99 mS/cm
••
••
•HI 8931C / HI8936C / HI 8936CL from 0 to 1999 µS/cm
••
••
•HI 8931D / HI8936D / HI8936DL from 0.0 to 199.9 µS/cm
Other features include (for HI 8931): recorder output in 0-20 mA or 4-
20 mA configuration; LED indicators which identify whether the control-
ler is in operation mode or selection mode; overtime control function.
Each instrument of the HI 8931 series, is supplied with a plastic front
cover and two mounting brackets. Power cables are not included.
Note:In order to avoid malfunctions and erroneous readings:
•do never connect more than one electrode type (DIN or input
transmitter) to the instrument
• do never use both 0-20 mA and 4-20 mA recorder outputs at
the same time

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FUNCTIONAL DESCRIPTION HFUNCTIONAL DESCRIPTION H
FUNCTIONAL DESCRIPTION HFUNCTIONAL DESCRIPTION H
FUNCTIONAL DESCRIPTION HII
II
I89318931
89318931
8931
KEYPAD
MEASURE Toreadmeasurementsandenablediagnostictests
ΔALARM To display and set tolerance of the alarm
SET To display and set the working dosing point
TEST SLOPE Diagnostic function
TEST OFFSET Diagnostic function
When a key is pressed, the corresponding LED lights up to indicate that
the function is active.
TRIMMERS
SLOPE For slope calibration
ΔALARM To set the alarm tolerance
SET COARSE To coarsely adjust the set point
SET FINE To finely adjust the set point
LEDS
SET ON To indicate that the dosage is active
ΔALARM To indicate an alarm condition
DOSAGE MODE SWITCH To indicate that the continuous ON or OFF
mode is selected from dosing switch
SWITCH
OFF/AUTO/ON To select the dosing mode:
• OFF - dosing is disabled
• AUTO - automatic dosage, depending on
setpoint value and dosing selection
• ON - dosing always active

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Unplug the instrument from power supply before replacing the fuse.
Only one of DIN or INPUT TRANSMITTER can be used at a moment.
Leave unconnected the other connection.
Only one of recorder output connections (0-20 mA or 4-20 mA) can
be used at a moment. Leave unconnected the unused terminal.
REAR PANEL OF HI 8931 SERIES
1. DIN connector for EC probe
2. Trimmer for offset calibration
3. Label with marked A, B, C or D instrument type
4. SET terminals for connection to a dosing pump
5. ALARM terminals for connection to an external alarm device
6. Power supply terminals
7. Fuse holder
8. SET SELECT terminals for reverse control operation
9. mA OUTPUT terminals for connection to a recorder
10. mA INPUT from a conductivity transmitter
11. POWER OUTPUT terminals (+20 V and COM) for connection
to a conductivity transmitter (HI 8936)
12. Disable overtime dosing connection
13. Overtime dosing set knob (about 5 to 60 min)

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MECHANICAL DIMENSIONS
OF HI8931
Front view of the panel-mounted unit
These dimensions show the cutout size for the installation.
Side view of the panel-mounted unit
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.

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HI 8936A
HI 8936B
HI 8936C
HI 8936D
HI 8936AL
HI 8936BL
HI 8936CL
HI 8936DL
FUNCTIONAL DESCRIPTION HFUNCTIONAL DESCRIPTION H
FUNCTIONAL DESCRIPTION HFUNCTIONAL DESCRIPTION H
FUNCTIONAL DESCRIPTION HII
II
I89368936
89368936
8936
1. Back cover
2. Top cover
3. Liquid Crystal Display
4. Screws for fastening the top cover

9
SIDE VIEW OF HI8936 SERIES
1. Top cover
2. Cable glands for wiring
MECHANICAL DIMENSIONS OF
HI 8936A, HI8936B, HI8936C, HI8936D

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MECHANICAL DIMENSIONS OF
HI 8936AL, HI8936BL, HI8936CL, HI8936DL

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CONDUCTIVITY PROBESCONDUCTIVITY PROBES
CONDUCTIVITY PROBESCONDUCTIVITY PROBES
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 HI 8936 conductivity transmitter.
The HI 7635 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 (72.5 psi).
Do not use in systems where the temperature exceeds 80°C (176°F).
HI7635

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HI7638 Tank Conductivity Probe
HI 7638 conductivity probe combines the proven 4-ring potentiometric
method of measuring conductivity with the platinum sensor and stain-
less 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 plastic cover 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 pres-
sure of up to 5 bar (72.5 psi).
This probe is supplied complete with a 7-pin DIN connector.
HI 7638

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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
0.1 mS/cm
0.01 mS/cm
1 μS/cm
0.1 μS/cm
±2% of Full Scale
excluding probe error
DIN (probe)
4-20 mA (input transmitter)
HI 7635 for in-line applications or
HI 7638 for tank (not included)
Manual, 2 point, through
offset and slope trimmers
Automatic, 0 to 60°C with ß=2%/°C
See also transmitter HI 8936
0 to 20 mA or 4 to 20 mA (isolated)
1, Isolated, 2A, Max. 240V, resistive load,
1,000,000 strokes
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
0.0 mS and 100.0 mS
0.00 mS and 10.00 mS
0 µS and 1000 µS
0.0 µS and 100.0 µS
OFF/AUTO/ON with selection switch
Adjustable, from 5 min to 60 min with knob or
Disable by wire strap - on rear panel
Continuous ON
115 or 230 Vac ±10%
(user selectable); 60/50 Hz
Range
HI 8931A
HI 8931B
HI 8931C
HI 8931D
Resolution
HI 8931A
HI 8931B
HI 8931C
HI 8931D
Accuracy
(@20°C/68°F)
Inputs
Conductivity Probe
Calibration
Temp. Compensation
Recorder Output
Setpoint Relay and
Alarm Relay
Setpoint Range
HI 8931A
HI 8931B
HI 8931C
HI 8931D
Alarm Range
HI 8931A
HI 8931B
HI 8931C
HI 8931D
Dosing Control
Over Dosing Control
Backlight
Power Supply
SPECIFICATIONS HSPECIFICATIONS H
SPECIFICATIONS HSPECIFICATIONS H
SPECIFICATIONS HII
II
I89318931
89318931
8931

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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
0.1 mS/cm
0.01 mS/cm
1 µS/cm
0.1 µS/cm
±2% of Full Scale
excluding probe error
HI 7635 for in-line applications or
HI 7638 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 ß=2%/°C
4 to 20 mA not-isolated
max. 500 Ohm
IP 65
12 to 30 Vdc
17 to 36 Vdc
0 to 50°C (32 to 122°F);
RH max 95%
165 x 110 x 71 mm
(6.5 x 4.3 x 2.8")
1 kg (2.2 lb.)
Range
HI 8936 A/AL
HI 8936 B/BL
HI 8936 C/CL
HI 8936 D/DL
Resolution
HI 8936 AL
HI 8936 BL
HI 8936 CL
HI 8936 DL
Accuracy
(@20°C/68°F)
Conductivity Probe
Calibration
Temperature
Compensation
Recorder output
Protection
Power Supply
HI 8936 A/B/C/D
HI 8936 AL/BL/CL/DL
Environment
Dimensions
Weight
SPECIFICATIONS HSPECIFICATIONS H
SPECIFICATIONS HSPECIFICATIONS H
SPECIFICATIONS HII
II
I89368936
89368936
8936
Enclosure
Environment
Panel Cutout
Weight
Black anodized aluminum body; front and back
with ABS; transparent splash-proof front cover
-10 to 50°C (14 to 122°F); RH 95%
141 x 69 mm (5.6 x 2.7")
1 kg (2.2 lb.)

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REAR CONNECTIONS FOR HI 8931
• Power Connection Terminals
4-screw-terminal-strip for connection
to a 3-wire power cable according to
the indicated voltage (115 or 230V).
• DIN connector socket
For connection of the HI 7638
conductivity probe.
• IN/OUT Transmitter
2 wires of the 4-core signal cable from
the conductivity transmitter (HI8936)
have to be connected to the mA input ter-
minals (7, 8) by paying attention to the
polarity and the other 2 wires to the
"+20 V" and "COM" while paying
careful attention to the polarity (5, 6).
+20 V supply is the regulated DC supply required for the operation
of the external conductivity transmitter HI 8936.
Note:Only one of DIN or input transmitter connectors can be used at a
moment. Leave unconnected the unused input.
• Set Contacts
Dosing pumps or other control equipment
may be connected to the "SET" (Max. 2A,
240 V) terminals (1, 2). These contacts act
only as a "dry" switch allowing electrical
continuity, not as a power supply.
CONNECTIONSCONNECTIONS
CONNECTIONSCONNECTIONS
CONNECTIONS

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•Set Select
These contacts (4, 5) 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 25.
•Recorder Output (terminals 1, 2, 3)
These contacts are used for connection to a
recorder output. The output can be 0-20 mA
or 4-20 mA depending on the model and is
proportional to the measured conductivity
values.
Connect the “+” wire from the recorder to terminal 1 on the instru-
ment and the other wire (common) to terminal 2 for 4-20 mA re-
corder output or terminal 3 for 0-20 mA recorder output.
Note:Only one recorder output connection is permited. In order to avoid
damages leave unconnected the unused terminal.
•Alarm Contacts (terminals 5, 6)
During normal operation these termi-
nals remain closed.
If the measured conductivity level is not
within the tolerance of the set value, the
alarm contact is open. These contacts act
only as a switch. See also page 26.

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•Overtime dosing
When enabled this feature ensures that overdosage is avoided.
Select a desired maximum dosage period. If the dosage relay is
active more than the selected period an alarm condition is ac-
tivated and the dosage relay is deactivated.
To set the overtime dosing period rotate the overtime knob to
the proper position. The time can be set between approx. 5 min
to 60 min (from MIN to MAX position).
To disable the overtime dosage feature
make a short with a jumper wire between
the terminals of the proper connectors.
(see picture, terminals 1, 2)
DOSING MODE SELECTION
The DOSAGE switch and the corresponding right side LED on the
front panel are used to select and indicate the dosing mode.
OFF mode
The dosage is disabled. The corresponding
DOSAGE MODE LED blinks.
AUTO mode
The dosage is activated and deactivated ac-
cording with the selected setpoint. The cor-
responding DOSAGE MODE LED (right side
of the switch) is off.
Be sure that the DOSAGE switch is in AUTO position
when the meter is in normal operating mode.
ON mode
The dosage is always activated. The corre-
sponding DOSAGE MODE LED blinks.

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TERMINAL BOARD CONNECTIONS FOR H8936
• Remove the 4 screws and the top cover of the HI8936 conductivity trans-
mitter to obtain access to the terminal board connections.
•HI 8936 used in conjunction with HI 8931 controller
Use a PVC insulated 4-core cable to connect the transmitter to
the HI 8931 conductivity controller (see also page 22).

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• 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 HI7638).
Note: All external cables connector to the rear panel should be ended
with cable lugs.
The 4-core cable has to be connected
to the transmitter according to the la-
bel instructions on the 4-terminal strip.
The regulated D.C. supply required for
the proper operation of the transmit-
ter is "+20 V", labeled "+20 V" and "COM". The current (mA) out-
put 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 di-
rectly to the terminals labeled "+20 V"
and "COM", paying careful attention to
polarity (see also page 21) or if neces-
sary 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.

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CONDUCTIVITY PROBE CONNECTIONS
The connections for HI 7635
are color coded for easy in-
stallation and are as follows:
HI 7635 cable HI8936 transmitter
Black or Grey NTC
Red or Pink SENSOR
Brown or Orange probe pin 1
Blue probe pin 2
White probe pin 3
Green or Yellow probe pin 4
The connections for HI 7638
are as follows:
HI 7638 HI8936 transmitter
#1 probe pin 1
#2 probe pin 2
#3 probe pin 3
#4 probe pin 4
#5 NTC
#6 SENSOR
Note: NTC & SENSOR are equivalent, and are both labeled "SENSOR"
on the HI 8936 conductivity transmitter.
connector
inside view