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

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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