Hanna Instruments HI8936A, HI8931B, HI8936B, HI8936C, HI8936D Instruction Manual

...
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
S/cm) S/cm) S/cm) S/cm) S/cm) S/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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