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
TERMINAL BOARD CONNECTIONS
FOR HI 8936
• Remove the 4 screws and the top cover of
the HI8936 conductivity transmitter to obtain access to the terminal board connections.
•
HI8936 used in conjunction with HI8931
controller
tivity controller (see
also page 24).
The 4-core cable has
to be connected to the
transmitter according to
the label instructions on
the 4-terminal strip.
The regulated D.C. supply required for the
proper operation of the transmitter is
"+20V", labeled "+20V" and "COM". The
current (mA) output terminals are labeled
"4-20 mA" and "COM".
The transmitter is protected against inversion of supply voltage.
•
HI8936 used in conjunction with an external power supply
Use 2 PVC insulated
2-core cables.
Connect a +20V DC
power supply directly to
the terminals labeled
"+20V" and "COM", paying careful attention to polarity (see also page 24) or if
necessary in series with the receiving device.
The regulated D.C. supply required for the
proper functioning of the circuit is marked
"+20V" and "COM", and the transmitter
current output is indicated "4-20 mA" and
"COM".
Use a PVC insulated 4-core cable to connect the transmitter to the HI8931 conduc-
The transmitter is protected against inversion of supply voltage.
The power unit should provide a voltage
of +20V ±25%.
Max. current required: 40 mA.
1918
•
Use of an amplifier
REAR CONNECTIONS FOR HI 943500
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.
•
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 23 for proper connection scheme of
HI7635 and HI7638).
• Power Connection Terminals
(4-screw terminal
strip) for connection to
a 3-wire power cable
according to the indicated voltage (115V
or 230V).
• 7-pin DIN connector socket
For connection
to the HI 7638
conductivity
probe.
• + mA output -
The first and the second terminals are the
output terminals for connection to a recorder or other control equipment. The
output current varies from 0 to 20 mA or
from 4 to 20 mA, depending on model,
and is proportional to the measured conductivity
value.
• Set Select
These contacts
permit the activation of the Set
Contact relay
when the measured value is lower (closed
terminals) or higher (open terminals) than
the user's set value. See also page 27.
2120
• Set
CONDUCTIVITY PROBE CONNECTIONS
Dosing pumps or other control equipment
may be connected to the "SET" (Max. 2A,
230V) terminals. These contacts act only
as a "dry" switch allowing electrical conti-
not as a power
nuity,
supply.
• Alarm
Contacts
During normal operation these terminals
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 28.
The connections
for HI7635 are
color coded for
easy installation
and are as follows:
HI7635 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
HI7638 are as follows:
HI7638 HI8936 transmitter
#1 probe pin 1
#2 probe pin 2
#3 probe pin 3
#4 probe pin 4
#5 NTC
#6 SENSOR
connector
inside view
Note: NTC and SENSOR are equivalent and
are both labeled SENSOR on the
HI8936 conductivity transmitter.
2322
OPERATIONAL GUIDE
INITIAL PREPARATION & INSTALLATION:
Material needed:
•
a 3-wire power cable (for connection of
HI8931/HI943500 to the mains)
• a PVC insulated 4-core cable (as con-
nection cable between HI8931 and HI8936)
• rubber seals and a pipe sealant (for installation of HI7635)
FOR HI8931 AND HI8936 ONLY
• Remove the 4 screws
and the top of the
HI8936 Process Conductivity transmitter.
• Connect the 3-wire
power cable to the 4screw terminal strip
according to the voltage level as indicated
and pay particular attention to the correct
live, earth and neutral terminal connections.
• Connect the 2 wires
connected to the
4-20mA and COM
terminals of the 4core signal cable from
the conductivity trans-
mitter HI8936 to the terminals marked IN/
OUT TRANSMITTER paying careful attention to polarity. Connect the other 2 wires to
the +20V and COMM terminals paying careful attention to polarity.
• The HI8936 transmitter
may be wall-mounted at
any convenient location
close to the measurement
site. To minimize thermal
drifts due to extreme temperature fluctuations, particularly if the measurement is conducted outdoors, it is recommended that the transmitter is protected
in a casing.
• For the installation of the HI7635 conduc-
tivity probe, it is necessary to use rubber
seals between the probe and the pipe or
elbow joints. A pipe sealant is also recommended to ensure a leak free joint. When
screwing on the joints, take care not to
overtighten as excessive pressures can
cause the probe to be damaged.
• The conductivity probe HI7635 is supplied
with a 3m (10') length of cable. The six
2524
core cable from the
probe is connected to the
HI8936 process conductivity transmitter as
shown. The connections are color coded
for an easy installation. See page 23 for
the proper connection scheme.
• It is recommended that the HI7635 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 3m (10')
length cable. The six core
cable from this probe is connected to the HI 8936 pro-
cess conductivity transmitter
as shown.
The 7-pin DIN connector has to be removed when this probe is used in conjunction with HI8936 transmitter.
See page 23 for the proper connection
scheme.
FOR HI943500 ONLY
Ensure that the
HI7638 conductivity
probe is connected
to the meter securely by aligning
the pins with the
socket, pushing the
plug in and tightening the threaded ring.
OPERATING INFORMATION
The various parameters are set through the
front panel keys and trimmers.
When each key is pressed the corresponding LED is lit, indicating that the function is
operational.
Make sure that the conductivity meter, transmitter & probe are calibrated before using
the instrument for measurements (see page
30 & 34 for HI8931 & HI8936 and page 38
for HI943500).
SET POINT
To set the working point of the controller,
press the SET key. The display will indicate
the set value.
Use a small screwdriver 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
COMM.
SET
SET
SELECT
2726
is lower than the set-point
value and the SET ON LED
will be lit.
When the alarm is active the
ALARM LED is lit.
Below set-point control operation
Short the SET SELECT/
COMM. connectors with a
jumper wire.
COMM.
SET
SET
SELECT
The set cont. relay will close
if the measured value is
higher than the set-point
value and the SET ON LED
will be lit.
Note: The SET SELECT and COMM. relays
should be shorted or left open when
selecting the operation.
ALARM
Press the ∆AL key and the display will show
the set tolerance for the alarm.
The alarm contacts of HI 8931 remain open
during normal operation. If the measured conductivity value is not within the tolerance of the
set value, the alarm contacts will be closed.
The alarm contacts of HI943500 remain closed
during normal operation. If the measured conductivity level is not within the tolerance of the
set value, the alarm contact will be open.
TAKING MEASUREMENTS WITH HI8931
AND HI943500
After setting the working point and alarm value,
press the MEASURE key. The actual conductivity value of the test solution will be displayed.
Use a small screwdriver to adjust the
trimmer ∆AL until the
desired tolerance is
displayed.
Example: If the set
value is 200 µS/cm
and a ∆ Alarm of
50 µS/cm is set, an
alarm is activated every time the measured
value is higher than 250 µS/cm or lower
than 150 µS/cm.
TAKING MEASUREMENTS WITH
HI8936AL, HI 8936BL, HI 8936CL,
HI8936DL
The conductivity transmitters with LCD will always
display the measurement
value when connected to
the HI8931 controllers or
a power supply.
2928
CALIBRATION PROCEDURE OF
HI8931 & HI8936 WITH HI7635
Material Needed
• HI7635 conductivity probe
• HI8931 conductivity controller
•
HI8936 conductivity transmitter
•
A 20 mA f.s. ammeter (for transmitters
without LCD)
• A reference conductivity meter with auto-
matic temperature compensation accurately calibrated (e.g. HI 8733).
• Ensure that there is no solution inside the
HI7635 conductivity probe (dry probe).
• When the power is on, the ammeter should
read "4.0 mA". The HI8936L transmitter
with LCD should display "0".
PROCEDURE
• Connect the HI7635 probe to the HI8936
transmitter (see page 23).
• Connect the HI8936 transmitter to the
HI8931 controller (see page 24).
• Connect the HI8931 controller to the mains
(see page 24).
Before proceeding with
the calibration, make sure
that the meter is in mea-
MEA
SURE
surement mode (MEASURE LED will be lit) and not in set mode.
• Connect the ammeter to the HI8936 trans-
mitter to monitor the signal current (see
the following picture).
• If not, adjust the OFFSET trimmer of the
HI8936 transmitter to
obtain "4 mA" or "0"
on the HI8936L.
• The HI8931 control-
ler should display "0"
value.
• If not adjust the OFFSET trimmer of
HI8931 to display a
zero reading.
• Switch the flow on
and allow the sample
solution to flow
through the HI7635
conductivity probe.
Collect a sample of
this solution in a beaker.
• Measure the conductivity of the solution
with the HI8733 portable conductivity
meter with ATC. The
µS
°C
HI 8733
199.9
µS
19.99
mS
0
0.5
TEMPERATURE COEFFICIENT
s
ins
rum n
ON
OFF
1999
µS
199.9
mS
2.5
2
1.51
3130
value obtained will be used for the transmitter and controller calibration.
• The reading will be converted to mA by
the following formula:
mA = K (measured value x 16 ) + 4
2000
K = conversion factor depending on the model
Model Conversion factor K
HI8936A & AL 10
HI8936B & BL 100
HI8936C & CL 1
HI8936D & DL 10
For example, using a HI8936A, if the mea-
sured value is 123.4 mS, then
output current = 10 x (123.4 x 16 )+4
2000
= 13.9 mA
Adjust the SLOPE
trimmer of the HI8936
transmitter to read
"13.9 mA" on the
ammeter or the reading displayed by the
HI 8733 conductivity meter on the
HI8936L display. E.g. "123.4 mS".
HI 8733 conductivity meter. E.g.
"123.4 mS".
• The calibration is now complete and the
instrument is ready for use. All subsequent measurements will now be compensated to 25°C (77°F).
• If the instrument will not calibrate refer to
the Probe Maintenance and Cleaning section (see page 46).
• If the HI8936 transmitter is not used in
conjunction with the HI8931 controller, connect the transmitter to an external power
supply (see page 19). Connect the transmitter to the HI7635 conductivity probe
(see page 23) and to an ammeter (see
page 19).
The calibration of the transmitters with LCD
(HI 8936AL, HI8936BL , HI8936CL,
HI8936DL) does not require an ammeter.
Follow the above calibration procedure
performing the operations referred to the
HI8936 transmitter only.
• Adjust the SLOPE trimmer of the HI8931
controller until the controller reading is the
same as the reading displayed by the
3332
CALIBRATION PROCEDURE OF
HI8931 & HI8936 WITH HI7638
Material Needed
• HI7638 conductivity probe
• HI8931 conductivity controller
•
HI8936 conductivity transmitter
•
An ammeter (for transmitters without LCD)
• Calibration solutions, according to the different models:
HI7034 80 mS/cm @25°C
for HI8931A, HI 8936A & AL
HI7030 12.88 mS/cm @25°C
for HI8931B, HI 8936B & BL
HI7031 1413 µS/cm @25°C
for HI8931C, HI 8936C & CL
HI7033 84 µS/cm @25°C
for HI8931A, HI 8936A & AL
PROCEDURE
• Connect the HI 7638 to the HI8936 trans-
mitter (see page 23).
• Connect the HI8936 transmitter to the
HI8931 controller (see page 24).
• Connect the HI8931 controller to the mains
(see page 24).
Before proceeding with
the calibration, make sure
that the meter is in measurement mode (MEA-
MEA
SURE
SURE LED will be lit) and
not in set mode.
• Connect the ammeter to the HI8936 trans-
mitter to monitor the signal current (see
the following picture).
• Leave the HI7638 conductivity
probe in air (dry probe).
• When the power is on, the ammeter should
read "4.0 mA" or the HI8936L transmit-
ter with LCD should display "0".
• If not adjust the OFFSET trimmer of the
HI8936 transmitter to
obtain "4 mA" or "0"
on the HI8936L.
• The HI 8931 controller
should display "0"
value.
• If not adjust the OFFSET trimmer of
HI8931 to display a
zero reading.
3534
HI 7030
• Pour enough conductivity
solution into a plastic beaker to achieve at least
8 cm (3¼") of depth.
(3
8 cm
¼
")
• Immerse the probe into the beaker with the conductivity solution. The holes on the sleeve
must be completely submerged
in the solution.
• Tap the probe repeatedly on the bottom of
the beaker and stir it to ensure that no air
bubbles are trapped inside the sleeve.
• If the temperature of the probe is close to
that of the solution the display of HI8931
will stabilize quickly and provide a temperature compensated conductivity measurement. However, allow a few minutes
if there is a temperature difference of 5°C
(9°F) or more for the ATC circuitry to compensate completely.
•
For HI8936
Adjust the SLOPE trimmer of the HI8936
transmitter to read on the ammeter:
"10.4 mA" using HI7034 and HI8936A/AL
"14.304 mA" using HI7030 and HI8936B/BL
"15.304 mA" using HI7031 and HI8936C/CL
"10.72 mA" using HI7033 and HI8936D/DL
• FOR HI8931
When the reading stabilizes, turn the
SLOPE trimmer on the front of the HI8931
until the LCD reading is the same as the
calibration solution at 25°C (77°F), i.e.
"80.0 mS" using HI7034 with HI8931A
"12.88 mS" using HI7030 with HI8931B
"1413 µS" using HI7031 with HI8931C
"84.0 µS" using HI7033 with HI8931D
• The calibration is now complete and the
instrument is ready for use. All subsequent measurements will now be compensated to 25°C (77°F).
• If the instrument will not calibrate refer to
the Probe Maintenance and Cleaning section (see page 46).
• If the HI8936 transmitter is not used in
conjunction with the HI8931 controller, connect the transmitter to an external power
supply (see page 19). Connect the transmitter to the HI7638 conductivity probe
(see page 23) and to an ammeter (see
page 19).
The calibration of the transmitters with LCD
(HI 8936AL, HI8936BL , HI8936CL,
HI8936DL) does not require any ammeter.
Follow the above calibration procedure
performing the operations referred to the
HI8936 transmitter only.
3736
CALIBRATION PROCEDURE OF
HI943500 WITH HI7638
Material Needed
• HI7638 conductivity probe
• HI943500 conductivity controller
• Calibration solutions, according to the dif-
ferent models:
HI7034 80mS/cm @25°C for HI943500A
HI7030 12.88mS/cm@25°C for HI943500B
HI7031 1413 µS/cm @25°C for HI943500C
HI7033 84 µS/cm @25°C for HI943500D
PROCEDURE:
• Ensure that the probe
is connected to the
meter securely by aligning the pins with the
socket, pushing the plug
in and tightening the
threaded ring.
• Adjust the OFFSET trimmer if the LCD
does not show the zero reading.
HI 7030
• Pour enough conductivity
solution into a beaker to
achieve at least 8 cm
(3
8 cm
¼
")
(3¼") of depth.
• Immerse the probe into the
beaker with the conductivity
solution. The holes on the
sleeve must be completely
submerged in the solution.
• Insert the probe into the sleeve.
• With the conductivity probe in air,
press the MEASURE key to set the meter
to MEASURE mode.
• Tap the probe repeatedly on the bottom of
the beaker and stir it to ensure that no air
bubbles are trapped inside the sleeve.
• If the temperature of the probe is close to
that of the solution the display will stabilize quickly and provide you with a temperature compensated conductivity measurement.
However, allow a few minutes if there is a
temperature difference of 5°C (9°F) or more
for the ATC circuitry to compensate completely.
• When the reading stabilizes, turn the
SLOPE trimmer on the front of the
HI943500 until the LCD reading is the same
3938
of the calibration solution at 25°C (77°F),
i.e.:
80.0 mS using HI7034 with HI943500A
CONDUCTIVITY VERSUS
TEMPERATURE CHART
12.88 mS using HI7030 with HI943500B
1413 µS using HI7031 with HI943500C
84.0 µS using HI7033 with HI943500D
• The calibration is now complete and the
instrument is ready for use. All subsequent measurements will now be compensated to 25°C (77°F).
• If the instrument will not calibrate refer to
the Probe Maintenance and Cleaning section (see page 46).
°C °F HI7030 HI7031 HI7033 HI7034 HI7035 HI7039
(µS/cm) (µS/cm) (µS/cm) (µS/cm) (µS/cm) (µS/cm)
0 32 7150 776 64 48300 65400 2760
5 41 8220 896 65 53500 74100 3180
10 50 9330 1020 67 59600 83200 3615
15 59 10480 1147 68 65400 92500 4063
16 60.8 10720 1173 70 67200 94400 4155
17 62.6 10950 1199 71 68500 96300 4245
18 64.4 11190 1225 73 69800 98200 4337
19 66.2 11430 1251 74 71300 100200 4429
20 68 11670 1278 76 72400 102100 4523
21 69.8 11910 1305 78 74000 104000 4517
22 71.6 12150 1332 79 75200 105900 4711
23 73.4 12390 1359 81 76500 107900 4805
24 75.2 12640 1386 82 78300 109800 4902
25 77 12880 1413 84 80000 111800 5000
26 78.8 13130 1440 86 81300 113800 5096
27 80.6 13370 1467 87 83000 115700 5190
28 82.4 13620 1494 89 84900 117700 5286
29 84.2 13870 1521 90 86300 119700 5383
30 86 14120 1548 92 88200 121800 5479
31 87.8 14370 1575 94 90000 123900 5575
If you are calibrating a HI8931A or
HI943500A using HI7030 (12.88 mS/cm
@25°C) as buffer solution, turn the SLOPE
trimmer to display "12.88 mS", with a reference temperature of 25°C (77°F).
If you prefer a reference temperature of
20°C (68°F), turn the SLOPE trimmer to
display "11.67mS".
4140
DIAGNOSTIC TESTS
The HI8931 and HI943500 controllers are
designed with built-in diagnostic functions to
enable the user to check and troubleshoot the
instrument. The checks performed are through
the front panel keys and can be used to isolate
the cause of malfunction.
Press the MEASURE
key before proceeding
the following tests.
B) Test Slope
Press the TEST SLOPE key and the display should indicate the following values:
HI8931/HI943500A 100.0 mS ±5.0 mS
HI8931/HI943500B 10.00 mS ±0.50 mS
HI8931/HI943500C 1000 µS ±50 µS
HI8931/HI943500D 100.0 µS ±5.0 µS
A) Test Offset
Press the TEST OFFSET key and the
display should indicate the following values:
HI8931/HI943500A 0.0 mS ±1.0 mS
HI8931/HI943500B 0.00 mS ±0.10 mS
HI8931/HI943500C 000 µS ±100 µS
HI8931/HI943500D 0.0 µS ±1.0 µS
Note: The reading obtained by these func-
tions will vary if the OFFSET and the
SLOPE trimmers on the front panel
are adjusted.
4342
INSTALLATION EXAMPLES
Some typical installation setups are depicted
in the following examples:
Example #1
Example #2
Example #3
Example #4
Example #5
4544
PROBE MAINTENANCE & CLEANING
ACCESSORIES
The probe can be compensated for normal
contamination by a process of re-calibration.
However, it is recommended that the process
conductivity probe be removed from the system regularly for maintenance.
For HI7635 only: Deposits on the conductivity
probe can be removed by immersing the probe
in 0.1 N Hydrochloric acid for about 30 minutes. Heavier deposits may demand longer
immersion periods. Clean the electrode thoroughly with water prior to the reinstallation. On
reinstalling, check the seals carefully to ensure that a leak connection is obtained.
For HI7638 only: Rinse the probe with tap
water. If a more thorough cleaning is desired,
unscrew the Ultem sleeve and clean the sensors with a nonabrasive cloth or alcohol.
After cleaning the probe, re-calibrate the instrument. However, if the instrument will not
re-calibrate with the clean probe, you must
replace the probe.
Note: Always re-calibrate the meter when
attaching a new probe.
CONDUCTIVITY BUFFER SOLUTIONS
HI 7030L 12880 µS/cm (µmho/cm) @25°C
(77°F), 460 mL
HI 7030M 12880 µS/cm (µmho/cm) @25°C
(77°F), 230mL
HI 7031L 1413 µS/cm (µmho/cm) @25°C
(77°F), 460 mL
HI 7031M 1413 µS/cm (µmho/cm) @25°C
(77°F), 230 mL
HI 7033L 84 µS/cm (µmho/cm) @25°C
(77°F), 460 mL
HI 7033M 84 µS/cm (µmho/cm) @25°C
(77°F), 230 mL
HI 7034L 80000 µS/cm (µmho/cm)
@25°C (77°F), 460 mL
HI 7034M 80000 µS/cm (µmho/cm)
@25°C (77°F), 230 mL
HI 7035L 111800 µS/cm (µmho/cm) @25°C
(77°F), 460mL
HI 7035M 111800 µS/cm (µmho/cm) @25°C
(77°F), 230 mL
HI 7039L 5000 µS/cm (µmho/cm) @25°C
(77°F), 460mL
HI 7039M 5000 µS/cm (µmho/cm) @25°C
(77°F), 230 mL
4746
CONDUCTIVITY PROBES:
OTHER ACCESSORIES:
HI7635 In-line conductivity probe, 3 m
(10') cable (for HI8936 only)
142mm
5.60"
73mm
2.87"
52mm
2.04"
1" NPT
HI7638 Tank conductivity probe, 3 m
(10') cable (for HI 8936 or
HI943500)
HI731326 Small calibration screwdriv-
ers (20 pcs)
HI779/P 6-wire cable (100 m/330' roll)
HI8733 Portable conductivity meter
with automatic temperature
compensation
MANCDPRCR2 Instruction Manual
4948
WARRANTY
All Hanna Instruments meters are warranted
for two years against defects in workmanship
and materials when used for their intended
purpose and maintained according to instructions.
The probes are warranted for a period of
six months.
This warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering
or lack of prescribed maintenance are not
covered.
If service is required, contact the dealer from
whom you purchased the instrument. If under
warranty, report the model number, date of
purchase, serial number and the nature of the
failure. If the repair is not covered by the
warranty, you will be notified of the charges
incurred. If the instrument is to be returned to
Hanna Instruments, first obtain a Returned
Goods Authorization Number from the Customer Service department and then send it
with shipment costs prepaid. When shipping
any instrument, make sure it is properly packaged for complete protection.
To validate your warranty, fill out and return
the enclosed warranty card within 14 days
from the date of purchase.
All rights are reserved. Reproduction in whole
or in part is prohibited without the written
consent of the copyright owner.
Hanna Instruments reserves the right to
modify the design, construction and appearance of its products without advance
notice.
CE DECLARATION OF CONFORMITY
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the environment
in which they are used.
Operation of these instruments in residential area could cause unacceptable interferences
to radio and TV equipments, requiring the operator to take all necessary steps to correct
interferences.
The trimmers are sensitive to electrostatic discharges. It is recommended to use anti-static
screwdrivers.
Unplug the instrument from the power supply before replacing the fuse. External cables to
be connected to the rear panel should end with cable lugs.
To maintain the EMC performance of this equipment, use the recommended cables
mentioned on this instruction manual.
Any variation introduced by the user to the supplied equipment may degrade the instruments'
EMC performance.
To avoid electrical shock, do not use these instruments when voltages at the measurement
surface exceed 24VAC or 60VDC.
To avoid damages or burns, do not perform any measurement in microwave ovens.
5150
MANCDPRCR2
04/98
PRINTED IN
PORTUGAL
http://www.hannainst.com
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