Instruction Manual
HI 8510 • HI 8512
HI 8710 • HI 8711
HI 8720
Panel Mounted
pH and ORP
Indicators and
Controllers
www.hannainst.com
1
Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using these instruments.
This manual will provide you with the necessary information for correct
use of these instruments, as well as a precise idea of their versatility.
If you need additional technical information, do not hesitate to e-mail
us at tech@hannainst.com or view our worldwide contact list at
www.hannainst.com.
WARRANTYWARRANTY
WARRANTY
WARRANTYWARRANTY
HI 8510, HI 8512, HI 8710, HI 8711 and HI 8720 are guaranteed
for two years against defects in workmanship and materials when used
for their intended purpose and maintained according to instructions.
Electrodes and probes are guaranteed for six months. This warranty is
limited to repair or replacement free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed
maintenance is 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 problem. 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 Technical
Service department and then send it with shipping costs prepaid. When
shipping any instrument, make sure it is properly packed for complete
protection.
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
PRELIMINARY EXAMINATION .................................................................... 3
GENERAL DESCRIPTION ............................................................................ 3
MECHANICAL DIMENSIONS ...................................................................... 4
FUNCTIONAL DESCRIPTION HI 8510 ......................................................... 5
FUNCTIONAL DESCRIPTION HI 8512 ......................................................... 7
FUNCTIONAL DESCRIPTION HI 8710 ......................................................... 9
FUNCTIONAL DESCRIPTION HI 8711 ....................................................... 12
FUNCTIONAL DESCRIPTION HI 8720 ....................................................... 15
SPECIFICATIONS ................................................................................... 18
INITIAL PREPARATION ........................................................................... 21
OPERATIONAL GUIDE ............................................................................. 24
pH CALIBRATION ................................................................................... 28
pH VALUES AT VARIOUS TEMPERATURE .................................................. 30
pH DIAGNOSTIC TESTS ........................................................................... 31
ORP DIAGNOSTIC TESTS ......................................................................... 33
LED INDICATION .................................................................................... 34
TAKING REDOX MEASUREMENTS ............................................................ 35
ELECTRODE MAINTENANCE ..................................................................... 37
SUGGESTED INSTALLATIONS .................................................................. 40
ACCESSORIES ....................................................................................... 42
2
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY 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, immediately notify your dealer.
Each model is supplied with:
• Transparent Splash-proof Front Cover
• Mounting Brackets
• Instruction Manual
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 DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
HI 8510 and HI 8512
HI 8710, HI 8711 and HI 8720 pH and ORP controllers, are ideal for
process control monitoring in a wide range of industrial applications.
These instruments have been designed for easy and fast installation,
and are provided with membrane keypads on the front panel, large
display and autodiagnostic functions.
All connections are made through screw terminals on the rear panel.
Each model accepts either a direct input from a pH or ORP electrode or
from a transmitter through 4-20mA input. The instrument also
provides ±5V power output and input terminals for amplified
electrodes.
Moreover, you can choose the output configuration for connecting a
recorder or a PLC, between 0-20 or 4-20 mA.
Note: In order to avoid damages and erroneous readings:
• do never connect more than one electrode type (BNC, amplified
or input transmitter) to the instrument.
• do never use both the 0-20 mA and 4-20 mA recorder
outputs at the same time.
Other features include over time control function, selection of the dosing
direction (ACID, ALKALINE - HI 8710; OXID, REDUC - HI 8720) and the
possibility to set dosing action mode (OFF/AUTO/ON).
pH and ORP panel-mounted indicators, and
3
MECHANICAL DIMENSIONSMECHANICAL DIMENSIONS
MECHANICAL DIMENSIONS
MECHANICAL DIMENSIONSMECHANICAL DIMENSIONS
The meters are provided with a black anodized aluminum body,
front and back panels in shockproof ABS plastic and a transparent
splash-proof front cover.
Front view of the panel-mounted unit
The 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 space required to install the
indicator with complete wiring.
4
FUNCTIONAL DESCRIPTION HI 8510FUNCTIONAL DESCRIPTION HI 8510
FUNCTIONAL DESCRIPTION HI 8510
FUNCTIONAL DESCRIPTION HI 8510FUNCTIONAL DESCRIPTION HI 8510
FRONT PANEL
Keypad
SENSOR TEST To display the mV reading of the electrode and,
therefore, verify its working condition
pH 7 TEST To verify the internal circuit of the meter in
terms of Offset compensation
pH 4 TEST To verify the amplifier circuit of the meter
Note: Each time a key is pressed the corresponding LED is turned ON.
Trimmers
OFFSET For Offset calibration
SLOPE For Slope calibration
5
REAR PANEL HI 8510
1. BNC socket for pH electrode
2. Input from amplified electrode
3. Connections for Pt100 temperature sensor
4. Power supply terminals
5. Fuse holder
6. Recorder output terminals
7. Connection to the transmiter
8. Power for amplified electrode
9. Connection for matching pin
10. Connection for reference electrode
Unplug the instrument from the power supply before replacing the fuse.
Only one of BNC, AMP INPUT or INPUT TRANSMITTER connectors can be
used at a moment. Leave the other two inputs unconnected.
Only one of the two terminals 4-10 mA and 0-20 mA can be used
at one moment. Leave the other unconnected.
6
FUNCTIONAL DESCRIPTION HI 8512FUNCTIONAL DESCRIPTION HI 8512
FUNCTIONAL DESCRIPTION HI 8512
FUNCTIONAL DESCRIPTION HI 8512FUNCTIONAL DESCRIPTION HI 8512
FRONT PANEL
Keypad
0 mV TEST To verify the instrument calibration at 0 mV
1000 mV TEST To verify the slope at 1000 mV
Note: Each time a key is pressed the corresponding LED is turned ON.
Trimmers
CAL For ORP calibration
7
REAR PANEL HI 8512
1. BNC socket for ORP electrode
2. Input from amplified electrode
3. Power supply terminals
4. Fuse holder
5. Recorder output terminals
6. Connection to the transmitter
7. Power for amplified electrode
8. Connection for matching pin
9. Connection for reference electrode
Unplug the instrument from the power supply before replacing the fuse.
Only one of BNC, AMP INPUT or INPUT TRANSMITTER connectors can be
used at a moment. Leave the other two inputs unconnected.
Only one of the two terminals 4-10 mA and 0-20 mA can be used
at one moment. Leave the other unconnected.
8
FUNCTIONAL DESCRIPTION HI 8710FUNCTIONAL DESCRIPTION HI 8710
FUNCTIONAL DESCRIPTION HI 8710
FUNCTIONAL DESCRIPTION HI 8710FUNCTIONAL DESCRIPTION HI 8710
FRONT PANEL
Keypad
SET To set the pH dosage limit
MEASURE To enter measurement mode and to enable
diagnostic tests
SENSOR TEST To display electrode mV reading and verify its
working condition
ΔALARM To display & set alarm tolerance
pH 7 TEST To verify Offset compensation
pH 4 TEST To verify amplifier circuit
Note: Each time a key is pressed the corresponding LED is turned ON
or changes its blinking behavior (ΔALARM).
Trimmers
OFFSET For Offset calibration
SLOPE For Slope calibration
ΔALARM To set the alarm tolerance
9
SET/COARSE To coarsely adjust the setpoint
SET/FINE To finely adjust the setpoint
LEDs
ACID (blinking) Shows that acid dosage is active
ALK. (blinking) Shows that alkaline dosage is active
ΔALARM(blinking) Indicates an active alarm
DOSAGE MODE SWITCH Blinks when the dosing switch is in OFF or ON
position.
SWITCH
OFF/AUTO/ON To set the dosing mode:
• OFF - dosing is disabled
• AUTO - automatic dosage, depending on
setpoint value and dosing selection
• ON - dosing always active
10
REAR PANEL HI 8710
1. BNC socket for pH electrode
2. Input from amplified electrode
3. Connections for Pt100 temperature sensor
4. Connections for dosing pump
5. Reduc/Oxid dosage consent terminals
6. Alarm contacts
7. Power supply terminals
8. Fuse holder
9. Acid/Alkaline dosage selection terminals
10. Recorder output contacts
11. Connection to the transmitter
12. Power for amplified electrode
13. Connection for matching pin
14. Connection for reference electrode
15. Disable overtime connection
16. Overtime set knob (about 5 to 60 min)
Unplug the instrument from the power supply before replacing the fuse.
Only one of BNC, AMP INPUT or INPUT TRANSMITTER connectors can be
used at a moment. Leave the other two inputs unconnected.
Only one of the two terminals 4-10 mA and 0-20 mA can be used
at one moment. Leave the other unconnected.
11
FUNCTIONAL DESCRIPTION HI 8711FUNCTIONAL DESCRIPTION HI 8711
FUNCTIONAL DESCRIPTION HI 8711
FUNCTIONAL DESCRIPTION HI 8711FUNCTIONAL DESCRIPTION HI 8711
FRONT PANEL
Keypad
ALK. SET To set the working point of basic dosage
ACID SET To set the working point of acid dosage
MEASURE To enter measurement mode and to
enable diagnostic tests
SENSOR TEST To display electrode mV reading and,
therefore, verify its working condition
ΔALARM To display and set the alarm tolerance
pH 7 TEST To verify Offset compensation
pH 4 TEST To verify amplifier circuit
Note: Each time a key is pressed the corresponding LED is turned ON
or changes its blinking behavior (ALK.SET, ACID SET,
ΔALARM).
12
Trimmers
SLOPE For Slope calibration
OFFSET For Offset calibration
ΔALARM To set the tolerance of the alarm
ALK. SET
COARSE To coarsely adjust alkaline setpoint
FINE To finely adjust alkaline setpoint
ACID SET
COARSE To coarsely adjust acid setpoint
FINE To finely adjust acid setpoint
LEDs
ALK. SET (Blinking) Show that basic dosage is active
ACID SET (Blinking) Show that acid dosage is active
ΔALARM (Blinking) Indicate active alarm
ALK. DOSAGE MODE SWITCH Shows that the alkaline dosage switch
(Blinking) is in OFF or ON position
ACID DOSAGE MODE SWITCH Shows that the acid dosage switch is in
(Blinking) OFF or ON position
Switches
ALK. OFF/AUTO/ON
To set the dosing mode:
• OFF - dosing is disabled
• AUTO - automatic dosage, depending on alkaline setpoint
value
• ON - dosing always active
ACID OFF/AUTO/ON
To set the dosing mode (see above) for acid setpoint value
13
REAR PANEL HI 8711
1. BNC socket for pH electrode
2. Input from amplified electrode
3. Connections for Pt100 temperature sensor
4. Connections for dosing pump for acid
5. Connections for dosing pump for base
6. Alarm contacts
7. Power supply terminals
8. Fuse holder
9. Recorder output contacts
10. Connections to the transmitter
11. Power for amplified electrode
12. Connection for matching pin
13. Connection for reference electrode
14. Disable overtime connection
15. Overtime set knob (about 5 to 60 min)
Unplug the instrument from the power supply before replacing the fuse.
Only one of BNC, AMP INPUT or INPUT TRANSMITTER connectors can be
used at a moment. Leave the other two inputs unconnected.
Only one of the two terminals 4-10 mA and 0-20 mA can be used
at one moment. Leave the other unconnected.
14
FUNCTIONAL DESCRIPTION HI 8720FUNCTIONAL DESCRIPTION HI 8720
FUNCTIONAL DESCRIPTION HI 8720
FUNCTIONAL DESCRIPTION HI 8720FUNCTIONAL DESCRIPTION HI 8720
FRONT PANEL
Keypad
SET To set the working point of ORP dosage
MEASURE To enter measurement mode and to enable
diagnostic tests
ΔALARM To display and set the alarm tolerance
0 mV TEST To verify the instrument calibration at 0 mV
1000 mV TEST To verify the slope at 1000mV
Note: Each time a key is pressed the corresponding LED is turned ON
or changes its blinking behavior (ΔALARM).
15
Trimmers
CAL For ORP calibration
ΔALARM To display and set the alarm tolerance
SET/COARSE To coarsely adjust the setpoint
SET/FINE To finely adjust the setpoint
LEDs
OXID (Blinking) Show that the oxidant dosage is active
RED. (Blinking) Show that the reductant dosage is active
ΔALARM (Blinking) Indicate an active alarm
DOSAGE MODE SWITCH Blinks when the dosage switch is in OFF
or ON position.
Switches
OFF/AUTO/ON
To set the dosing mode:
• OFF - dosing is disabled
• AUTO - automatic dosage, depending on setpoint value
and dosing selection
• ON - dosing always active
16
REAR PANEL HI 8720
1. BNC socket for ORP electrode
2. Input from amplified electrode
3. Oxid/Reduc dosage consent terminals
4. Connections for dosing pump
5. Alarm contacts
6. Power supply terminals
7. Fuse holder
8. OXID/RED. dosage selection terminals
9. Recorder output contacts
10. Connections to the transmitter
11. Power for amplified electrode
12. Connection for matching pin
13. Connection for reference electrode
14. Disable overtime connection
15. Overtime set knob (about 5 to 60 min)
Unplug the instrument from the power supply before replacing the fuse.
Only one of BNC, AMP INPUT or INPUT TRANSMITTER connectors can be
used at a moment. Leave the other two inputs unconnected.
Only one of the two terminals 4-10 mA and 0-20 mA can be used
at one moment. Leave the other unconnected.
17
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
HI 8510
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18
HI 8710
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EGNARTNIOPTES Hp00.41ot00.0
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Δ EGNARMRALA
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19
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20
INITIAL PREPARATIONINITIAL PREPARATION
INITIAL PREPARATION
INITIAL PREPARATIONINITIAL PREPARATION
••
• Connect a 3-wire cable to the power supply
••
terminal according to the voltage level as
indicated, and pay particular attention to
the correct line, earth and neutral connections.
••
• For BNC electrodes, connect the electrode
••
to the BNC plug on the rear panel.
The instruments are equiped with differential
input. To benefit from differential input
advantages, connect the proper electrode
wire (if available) or a cable with a potential
matching pin, to the Matching Pin (terminal 4).
When the Matching Pin cannot be immersed
together with the electrode in the solution,
disable the differential input by shorting
the Electrode reference and the Matching
Pin terminals with a jumper wire (terminals
3 and 4).
••
• For amplified electrodes connect the
••
electrode pH input wire to the AMP INPUT
terminal (1), the electrode power suply wires
to the ±5 V terminals (7, 8) and the
electrode reference wire to the reference
terminal (5). Make a short between Reference
and Matching pin terminals (5, 6).
If the amplified electrode is provided with BNC connector, connect
the electrode to the BNC input and the power supply wires to the
±5V terminals (7, 8).
••
• For Inputs from transmitter, connect the 2
••
signal wires of the analog transmitter to the
"INPUT TRANSMITTER" terminals (7, 8), while
paying attention to the indicated polarity.
Note: Only one of BNC, AMP INPUT or INPUT
TRANSMITTER connectors can be used at
one moment. Leave the other two inputs
unconnected.
• Recorder output terminals: these contacts
are used for connection to a recorder. The
output can be 0-20 mA or 4-20 mA depending
on the connection, and is proportional to
the pH or ORP reading.
21
Connect the “+” wire of the recorder to the terminal 1 on the
instrument and the other wire (common) to terminal 2 for 4-20
mA recorder output or to terminal 3 for 0-20 mA recorder output.
Note: Only one recorder output connection is possible. In order to
avoid malfunction leave the unused terminal unconnected.
••
• Pt100 terminals: these contacts are used to
••
connect the Pt100 temperature sensor for
automatic temperature compensation of pH
readings. If temperature compensation is not
required, connect a 110 Ohm/0.25W resistor
across the terminals (equivalent to a fixed
temperature of 25°C/77°F).
Connect the Pt100 terminals to terminals 3 and 4. In case the
wires are shielded, connect the shield wire to terminal 2.
••
• The HI 8710 models are single dosage
••
controllers with acid/alkaline selection.
If acid dosage is needed (e.g. in chromium
VI reduction), leave open the ACID/ALK.
selection terminals (4 and 5), while for
alkaline dosage (e.g. in cyanide oxidation), make a short circuit
across the ACID/BASE selection terminals (4 and 5) with a jumper wire.
••
• The HI 8720 models are single dosage controllers with oxidant/
••
reductant selection.
If oxidant dosage is needed (e.g. in cyanide
oxidation), leave open the OXID/RED. selection
terminals (4 and 5). The dosing is activated
when the reading falls bellow the setpoint
value. For reductant dosage (e.g. in chromium
VI reduction), make a short circuit across
the OXID/RED. selection terminals (4 and 5) with a jumper wire.
The dosing is activated when the reading exceeds the setpoint value.
••
• SET contacts (HI8710 and HI8720)
••
picture terminals 1, 2): these contacts (max.
2A, 240 V) are used to connect the dosing
pump, and act only as a switch for the
power to the drive.
••
• ACID contacts (HI 8711) (see picture,
••
terminals 1 and 2): these contacts are used
to connect the dosing pump for acid, and
act as a switch for the power to the drive.
(see
22
••
• ALK. contact (HI 8711) (see picture, terminals
••
3 and 4): these contacts are used to connect
the dosing pump for base, and act as a
switch for the power to the drive.
••
• CONSENT contacts (HI 8710 and HI 8720,
••
see picture, terminals 3 and 4): these contacts
(max. 2A, 240V) are used for reduction and
oxidation reactions when the pH controller
works in conjunction with an ORP controller and vice versa.
In these applications, the consent contacts of both meters are
connected together to link the ORP and pH controllers, so that ORP
dosage will occur only if the actual pH value is correct. This feature
avoids overdosages which may lead to undesirable pollution.
For HI 8710, the "Consent" contacts (terminals
3 and 4) can be left open if the instrument
is used independently as pH controller only.
For HI 8720, the "Consent" contacts (terminals
3 and 4) should be shorted if the instrument
is used independently as ORP controller only.
••
• ALARM contacts (HI 8710, HI8711 and
••
HI8720) (see picture terminals 5, 6): If the
pH or ORP measurement are inside the set
value tolerance the alarm contact is closed
and ALARM LED is OFF (alarm is not active).
If the pH or ORP measurement is not within
the set value tolerance, the alarm contact is
opened and ALARM LED blinks (alarm is
active). This ensures that a power down condition will generate an
alarm condition.
••
• 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 connector (see picture, terminals
1 and 2).
Note: All external cables connected to the rear
panel should be ended with cable lugs.
23
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
All instrument settings are made via front panel keys and trimmers.
When a key is pressed, the corresponding LED lights up to show the
operating function. If the LED blinks before pressing the key, it will
change the blinking style.
If using an asigned electrode, make sure that the meter is calibrated
before starting any operation (see "Calibration" section for details).
Be sure that the dosage switch is in AUTO position.
DOSING MODE SELECTION
The DOSAGE switch and the corresponding right side LED on the front
panel (one for HI 8710 & HI 8720; two for HI 8711) are used to
select and indicate the dosing mode.
OFF mode
The dosage is disabled. The corresponding
DOSAGE SWITCH LED blinks.
AUTO
mode
The dosage is activated and deactivated according
with the selected setpoint. The corresponding
DOSAGE SWITCH LED 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 corresponding
DOSAGE SWITCH LED blinks.
Note: Two switches are available for HI 8711, one for alkaline and the
other for acid dosage channel. By putting one of the switches in
OFF position, the corresponding dosage relay is deactivated. The
ALARM relay is deactivated but the ALARM LED will work in
accordance with the setpoint, alarm threshold and input reading.
SET POINTS (HI 8710 and HI 8720)
To set the working point for pH or ORP dosage, press SET and the
display will show the set value. The SET LED turns ON.
24
Using a small screwdriver adjust the COARSE and FINE trimmers to
display the desired set value.
SET POINTS (HI 8711)
To set the working point for alkaline dosage, press the ALK. SET key and
the display will show the set value for alkaline dosage. The ALK. SET LED
will turn ON if alkaline dosage is deactivated or change blinking style.
Using a small screwdriver adjust the ALK. SET COARSE and FINE
trimmers to display the desired base set value.
To set the working point for acid dosage, press the ACID SET key and
the display will show the set value for acid dosage. The ACID SET LED
will turn ON if acid dosage is deactivated or change blinking style.
Using a small screwdriver adjust the ACID SET COARSE and FINE
trimmers to display the desired acid set value.
25
Note: The ALK. and the ACID setpoints can be set on the entire range
0.00 pH to 14.00 pH using COARSE and FINE trimmers.
In order to avoid erroneous situations the ALK. setpoint value
should not exceed the ACID setpoint value.
ALARMS (HI 8710, HI 8711 and HI 8720)
To set the alarm tolerance, press ΔALARM key and the display will
show the current value.
Using a small screwdriver adjust the ΔALARM trimmer to display the
desired tolerance.
Examples:
For HI 8710, if the set value is pH 3 and the ΔALARM is 1.5 pH, the
instrument generates an alarm every time the pH reading is higher
than 4.5 pH or lower than 1.5 pH.
For HI 8711, if the set values are pH 7 and pH 8, and the ΔALARM is
1.5 pH, the instrument generates an alarm every time the pH reading
is higher than 9.5 pH or lower than 5.5 pH.
For HI 8720, if the set value is 300 mV and the ΔALARM is 100 mV, the
instrument generates an alarm every time the ORP reading is higher than
400 mV or lower than 200 mV.
An alarm is generated if the dosing time exceeds the overtime dosage
period set (if not disabled).
MEASUREMENTS
After setting the pH (or ORP) and alarm (if
available) thresholds, immerse the electrode in
the solution to be tested and press MEASURE.
26
The actual pH or ORP value of the test solution is displayed.
When acid dosage is active, the ACID LED lights
up, while during alkaline dosage, the ALK. LED
turns on (HI 8710 only).
When oxidant dosage is active, the OXID LED
lights up, while during reductant dosage, the
RED. LED turns on (HI 8720 only).
When the dosage switch is in OFF or continuous
ON position the corresponding LED blinks (the
LED on the right side of the switch).
If the dosing switch is in OFF position the dosing
and alarm relays are deactivated and the ALK.
or ACID LEDs are OFF.
If the dosing switch is in ON position the DOSING relay is always
activated and the ALK. or ACID LEDs blink; the ALARM relay is activated
and the ALARM LED blinks according with the input reading, setpoint
and ALARM threshold.
If the dosing switch is in AUTO position, all relays are controlled
depending on measure, setpoint and ALARM threshold.
If overtime dosing function is enabled overtime
OFF terminals (1,2) open and the DOSAGE switch
is in AUTO or ON position, an ALARM is generated
if the dosing time exceeds the overtime set period
(overtime knob on the rear panel).
The dosing relay is not deactivated if the DOSAGE
switch is in ON position but is deactivated if the
switch is in AUTO position, when the overtime
period is overpassed.
To leave overtime ALARM mode and return to normal operation move
the DOSAGE switch in OFF and then in AUTO or ON position again. The
dosage and alarm relays will be controlled depending on the measure,
setpoint and alarm thresholds. The overtime counter is reinitialized to 0.
27
Two DOSAGE MODE switches are designed for HI8711, one for ACID
and the other for ALK. channels. If for any reason one of them is in
OFF position the corresponding dosing relay is deactivated. The alarm
relay will be activated only in accordance with the other channel.
The ALARM LED will work as in AUTO mode.
pp
H CALIBRATIONH CALIBRATION
p
H CALIBRATION
pp
H CALIBRATIONH CALIBRATION
Make sure that the instrument is in measurement
mode (MEASURE LED is on) before proceeding
with calibration.
Measure the temperature of the calibration
buffer with a reference thermometer.
Remove the protective cap from the electrode.
Rinse the pH electrode and the reference
thermometer in pH 7.01 rinsing solution and
then immerse them in pH 7.01 buffer solution
(HI 7007).
Note: The electrode should be submerged at
least 4 cm (1½") into the solution. The
thermometer should be located as close
as possible to the pH electrode.
Shake briefly and wait one minute before adjusting the OFFSET
trimmer to display the buffer solution value, i.e. "pH 7.01" at 25°C
(77°F).
If the buffer solution temperature is different from 25°C (77°F), refer
to the "pH vs. temperature" chart on page 30 for the appropriate pH
value at the noted temperature.
28
Rinse pH electrode and the reference thermometer thoroughly with pH
4.01 rinsing solution, then immerse them in pH 4.01 (HI 7004) or pH
10.01 (HI 7010) buffer solution.
Note: For accurate readings, use pH 4.01 if you are going to measure
acid samples or pH 10.01 for alkaline measurements.
Shake briefly and wait one minute before adjusting the SLOPE
to display the ph value of the buffer solution, i.e. pH 4.01 (or 10.01)
at 25°C (77°F).
If the buffer solution temperature is different from 25°C (77°F), refer
to the "pH vs. temperaturare" chart on page 30 for the appropriate pH
value at the noted temperature.
The calibration is now complete and the instrument is ready for use.
Note: If a Pt100 temperature sensor and Matching Pin is used,
immerse them into the buffer solutions during calibration
together with the electrode.
trimmer
29
pp
H VALUES AT VARIOUS TEMPERATUREH VALUES AT VARIOUS TEMPERATURE
p
H VALUES AT VARIOUS TEMPERATURE
pp
H VALUES AT VARIOUS TEMPERATUREH VALUES AT VARIOUS TEMPERATURE
Temperature has an effect on the pH. The calibration buffer solutions
are affected by temperature changes to a lesser degree than normal
solutions.
Please refer to the following chart to perform the pH calibration:
PMETSREFFUBHp
CºFº10.468.610.781.910.01
023 10.489.631.764.923.01
514 00.459.601.793.942.01
0105 00.429.670.733.981.01
5195 00.409.650.
0286 00.488.630.722.960.01
5277 10.468.610.781.910.01
0368 20.458.600.741.969.9
5359 30.448.699.611.929.9
04401 40.448.689.670
54311 50.438.689.640.958.9
05221 60.438.689.610.928.9
55131 80.448.689.699.897.9
06041 90.448.689.679.877.9
56941 11.448.699.659.
07851 21.458.699.639.857.9
For instance, if the buffer temperature is 25°C (77°F), calibrate to
read on the display pH 4.01 or 7.01 or 10.01.
If the buffer temperature is 20°C, calibrate to read on the display
pH 4.00 or 7.03 or 10.06.
If the buffer temperature is 50°C, calibrate to read on the display
pH 4.06 or 6.98 or 9.82.
772.921.01
.988.9
867.9
30
pp
H DIAGNOSTIC TESTSH DIAGNOSTIC TESTS
p
H DIAGNOSTIC TESTS
pp
H DIAGNOSTIC TESTSH DIAGNOSTIC TESTS
HI 8510, HI 8710 and HI 8711 are provided with autodiagnostic
functions that allow to check and troubleshoot any malfunctioning.
The functions are made via front panel keys to isolate the cause of
malfunction whether it is due to pH electrode contamination, internal
offset circuit or amplifier circuit.
Follow the procedure described below.
First press the MEASURE key, then one of the
following keys.
A)
Sensor Test
Immerse the electrode in pH 7.01 buffer
solution (HI 7007), press SENSOR TEST
key and the display shows the mV
response of the electrode.
The corresponding LED turns on.
If the electrode is in good working condition, the value should be
within ±30 mV.
A value between 30 and 60 mV or -60 and -30 mV, indicates
some contamination of the electrode.
If the value is higher than 60 mV or lower than -60 mV, the
contamination is too high and the electrode should be replaced.
B)
Internal Offset Circuit Test
Press the pH 7 TEST key and the display should show a value
within 7±1 pH, to verify the internal circuit of the meter in
terms of the offset compensation.
The corresponding LED turns on.
31
C)
Amplifier Circuit Test
Press the pH 4 TEST key and the display should show a value
within the 3.30 to 4.30 pH range, to verify the amplifier circuit of
the meter.
The corresponding LED turns on.
32
ORP DIAGNOSTIC TESTSORP DIAGNOSTIC TESTS
ORP DIAGNOSTIC TESTS
ORP DIAGNOSTIC TESTSORP DIAGNOSTIC TESTS
HI 8512 and HI 8720 are ORP controllers provided with autodiagnostic
functions that allow to check and troubleshoot any malfunctioning.
The functions are made via front panel keys to isolate the cause of
malfunction.
For HI 8720 only, press MEASURE key before
proceeding with the following tests.
A)
0 mV Test
Press the 0 mV TEST key and the
display should show a value of 0±10
mV, to verify the "zero" calibration of
the instrument. The corresponding LED
turns on.
B)
1000 mV Test
Press the 1000 mV TEST key and the
display should show a value of
1000±20 mV, to verify the slope at
1000 mV. The corresponding LED turns on.
33
LED INDICATIONLED INDICATION
LED INDICATION
LED INDICATIONLED INDICATION
All LEDs above the keys indicate the state of each function, whether it
is active or the display is indicating the mode.
For HI 8711 only
Each LED can be in one of the following states:
A) Light on The mode is displayed on the LCD but
is not active, e.g. the alarm setpoint is
displayed but the alarm contact is
open.
B) Light blinking 25% on, 75% off
The mode is not displayed but it is
active, e.g. the alarm contact is opened
but the alarm setpoint is not displayed.
C) Light blinking 75% on, 25% off
The mode is active and being displayed.
D) Light off The function is neither active nor
displayed.
34
TAKING REDOX MEASUREMENTSTAKING REDOX MEASUREMENTS
TAKING REDOX MEASUREMENTS
TAKING REDOX MEASUREMENTSTAKING REDOX MEASUREMENTS
Redox measurements allow the quantification of the solution oxidizing/
reducing power, and are commonly expressed in mV.
Oxidation may be defined as the process during which a molecule (or
an ion) loses electrons and reduction as the process by which electrons
are gained.
Oxidation is always coupled together with reduction, so that as one
element gets oxidized, the other is automatically reduced, therefore
the term oxidation-reduction is frequently used.
Redox potentials are measured by an electrode capable of absorbing
or releasing electrons without causing any chemical reaction.
The most common ORP electrodes are provided with gold or platinum
surfaces; gold features a higher resistance than platinum in conditions
of strong oxidation, while platinum is preferred for measuring oxidizing
solutions containing halides, and for general purposes.
When a platinum electrode is immersed in an oxidizing solution, a
monomolecular layer of oxygen is developed on its surface. This layer
does not prevent the electrode from functioning, but it increases the
response time. The opposite effect is obtained when the platinum
surface absorbs hydrogen in the presence of reducing mediums. This
phenomenon is rough on the electrode.
To make correct redox measurements, it is necessary that the surface
of the electrode is clean and smooth, and that a preventive treatment
is performed.
Because the Pt/PtO system depends on the solution pH level, the
electrode pre-treatment may be determined by the pH and the redox
potential of the solution to be measured.
Generally, if the ORP (mV) reading corresponding to the pH solution
value is higher than the value in the table below, an oxidizing
pre-treatment is necessary; otherwise a reducing pre-treatment is necessary:
HpVmHpVmHpVmHpVmHpVm
00991029206830084047
50866046708580259064
0100411043210823102241061
Reducing pre-treatment: immerse the electrode for some minutes in
HI 7091 solution.
35
Oxidizing pre-treatment: immerse the electrode for some minutes in
HI 7092 solution.
If no pre-treatment is performed, the electrode will have long response
times.
If working with refillable electrodes, always check the internal electrolyte
level and refillwith HI 7071
least 2.5 cm below the filling hole).
If measurements are taken in solutions containing sulfides or proteins,
the cleaning of the electrode junction must be performed (see "Cleaning
Procedure" section for details).
To check the correct functioning of the ORP electrode, immerse it into
HI 7020 test solution and verify that the reading is within 200 and
275 mV.
After the test, rinse the electrode thoroughly with water and proceed
with the oxidizing or reducing pre-treatment before taking any
measurement.
When not in use, the electrode tip should be kept moist and far from
any type of mechanical stress which might cause damage. For this
reason, it is reccommended to store the electrode with a few drops of
HI 70300 storage solution in the supplied protective cap.
solution, if necessary (the level must be at
36
ELECTRODE MAINTENENCEELECTRODE MAINTENENCE
ELECTRODE MAINTENENCE
ELECTRODE MAINTENENCEELECTRODE MAINTENENCE
PREPARATION PROCEDURE
Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is
normal with electrodes and they will disappear when rinsed with water.
During transport tiny air bubbles may form inside the glass bulb, and the
electrode cannot function properly under these conditions. Remove the
bubbles by "shaking down" the electrode as you would do with a glass
thermometer.
If the bulb and/or junction are dry, soak the electrode in HI 70300
storage solution for at least one hour.
37
For refillable electrodes:For refillable electrodes:
For refillable electrodes:
For refillable electrodes:For refillable electrodes:
If the internal electrolyte solution is more than 1 cm (½") below the
filling hole, add HI 7082
electrodes or HI 7071
solution (3.5M KCl) for double junction
(3.5M KCl+AgCl) for single junction electrodes.
For a faster response unscrew the filling hole screw during measurements.
®®
®
For AmpHelFor AmpHel
For AmpHel
For AmpHelFor AmpHel
®®
electrodes: electrodes:
electrodes:
electrodes: electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
MEASUREMENT
Rinse the electrode tip with distilled water.
Immerse the electrode tip (4 cm) in the sample and stir gently for
approximately 30 seconds.
For a faster response and to avoid cross contaminations, before taking
measurements, rinse the electrode tip with some solution to be tested.
STORAGE
To minimize clogging and assure a quick response time, the electrode
glass bulb and junction should be kept moist at any time.
Store the electrode with a few drops of HI70300 storage solution in
the protective cap (in its absence, use HI 7071
junction, or HI 7082
for double junction electrodes).
electrolyte for single
Follow the above "Preparation Procedure" before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED WATER OR DRY.
PERIODIC MAINTENANCE
Inspect electrode and cable. The cable used for the connection to the
meter must be intact and there must be no points of broken insulation
on the cable or cracks on the electrode stem or bulb.
Connectors must be perfectly clean and dry. If any scratches or cracks
are noted, replace the electrode.
Rinse off any salt deposits with water.
For refillable electrodes:For refillable electrodes:
For refillable electrodes:
For refillable electrodes:For refillable electrodes:
Refill the electrode with fresh electrolyte solution (HI 7071
junction electrodes or HI 7082
for double junction). Allow the elec-
for single
trode to stand upright for 1 hour.
Follow the above "Storage Procedure".
AmpHel® is a registered Trademark of "Hanna Instruments"
38
CLEANING PROCEDURE
• General Soak in HI 7061
approximately 1 hour.
Removal of films, dirt or deposits on the membrane/junction:
• Protein Soak in Hanna HI 7073
for 15 minutes.
general cleaning solution for
protein cleaning solution
• Inorganic Soak in Hanna HI 7074
for 15 minutes.
• Oil/grease Rinse with Hanna HI 7077
IMPORTANT: After performing any of the cleaning procedures, rinse
the electrode thoroughly with distilled water, drain and refill the
reference chamber with fresh electrolyte, (not necessary for gel-filled
electrodes) and soak the electrode in HI 70300
least 1 hour before taking measurements.
TROUBLESHOOTING
Evaluate your electrode performance based on the following:
••
• Noise
(readings fluctuate up and down) could be due to:
••
--
- Clogged/Dirty Junction:
--
--
- Loss of shielding due to low electrolyte level (in refillable
--
electrodes only): refill with HI 7071
or HI 7082
••
• Dry Membrane/Junction: soak in HI 70300
••
at least 1 hour
••
• Drifting: soak the electrode tip in warm HI 7082
••
hour and rinse the tip with distilled water; refill with fresh electrolyte
(HI 7071
electrodes)
••
• Low Slope: refer to the above "Cleaning Procedure"
••
••
• No Slope:
••
(replace the electrode if cracks are found)
••
• Slow Response/Excessive Drift:
••
for 30 minutes, rinse thoroughly in distilled water and then follow
the above "Cleaning Procedure"
for double junction electrodes
for single junction and HI 7082
check the electrode for cracks in glass stem or bulb
refer to the above "Cleaning Procedure"
inorganic cleaning solution
oil & fat cleaning solution.
storage solution for at
solution for single junction
storage solution for
solution for one
for double junction
soak the tip in HI 7061
solution
••
• For ORP Electrodes: polish the metal tip with a light abrasive
••
paper (pay attention not to scratch the surface) and rinse
thoroughly with water.
39
SUGGESTED INSTALLATIONSSUGGESTED INSTALLATIONS
SUGGESTED INSTALLATIONS
SUGGESTED INSTALLATIONSSUGGESTED INSTALLATIONS
SHORT DISTANCE, INDOOR INSTALLATION
Due to the low current involved, a very high grade of insulation is
required.
A dry environment is needed in order to obtain a insulation level not
lower than 1012ohm.
This type of connection is very delicate and requires constant attention
to maintain proper operating conditions.
Conventional electrodes should be used in indoor applications only,
with a cable not longer than 10 m (33').
MEDIUM DISTANCE, INDOOR/OUTDOOR INSTALLATION
When an outdoor installation is required, to obtain accurate readings
at distances from 10 to 50 m (33-165'), it is necessary to install a
transmitter.
Since the introduction of AmpHel® electrodes, these distances are no
longer a problem. You can now connect the meter directly to an
AmpHel® electrode, saving the cost of a transmitter or expensive
coaxial cable.
The standard cable length for AmpHel® electrodes is 5 m (16.5').
Additional lengths of regular cable up to 50 m (165'), can be installed
without special connectors.
AmpHel® electrodes feature a built-in a micro-amplifier to boost the
signal, drastically reducing susceptibility to noise and drift.
The sealed electrode body can stand a moisture up to 100% RH
without any effect on the signal.
AmpHel® is a registered Trademark of "Hanna Instruments"
40
LONG DISTANCE INSTALLATIONS, ISOLATED OUTPUT FOR PC INTERFACE
If the needed installation distance is greater than 50 m (165'), it is
necessary the use of a transmitter.
HANNA instruments® offers a full line of pH and ORP transmitters with or
without display.
AmpHel® is a registered Trademark of "Hanna Instruments"
41
ACCESSORIESACCESSORIES
ACCESSORIES
ACCESSORIESACCESSORIES
pH CALIBRATION SOLUTIONS
HI 7004M pH 4.01 buffer solution, 230 mL
HI 7004L pH 4.01 buffer solution, 500 mL
HI 7006M pH 6.86 buffer solution, 230 mL
HI 7006L pH 6.86 buffer solution, 500 mL
HI 7007M pH 7.01 buffer solution, 230 mL
HI 7007L pH 7.01 buffer solution, 500 mL
HI 7009M pH 9.18 buffer solution, 230 mL
HI 7009L pH 9.18 buffer solution, 500 mL
HI 7010M pH 10.01 buffer solution, 230mL
HI 7010L pH 10.01 buffer solution, 500 mL
ORP SOLUTIONS
HI 7020M ORP test solution @200/275 mV, 230 mL bottle
HI 7020L ORP test solution @200/275 mV, 500 mL bottle
HI 7091M Pre-treatment reducing solution, 230 mL bottle
HI 7091L Pre-treatment reducing solution, 500 mL bottle
HI 7092M Pre-treatment oxidizing solution, 230 mL bottle
HI 7092L Pre-treatment oxidizing solution, 500 mL bottle
ELECTRODE MAINTENANCE SOLUTIONS
HI 70300M Storage solution, 230 mL bottle
HI 70300L Storage solution, 500 mL bottle
HI 7061M General cleaning, 230 mL bottle
HI 7061L General cleaning, 500 mL bottle
HI 7073M Protein cleaning solution, 230 mL
HI 7073L Protein cleaning solution, 500 mL
HI 7074M Inorganic cleaning, 230 mL
HI 7074L Inorganic cleaning, 500 mL
HI 7077M Oil & fat cleaning, 230 mL
HI 7077L Oil & fat cleaning,500 mL
HI 7071 3.5M KCl+AgCl electrolyte solution (4 x 50 mL)
HI 7072 1M KNO3 electrolyte (4 x 50 mL)
HI 7082 3.5M KCl electrolyte solution (4 x 50 mL)
42
pH ELECTRODES
HI 1090T Screwcap PG13.5 connector, double junction, glass
body
HI 1110S Screw connector, single junction, glass body
HI 1130B/3 BNC connector, 3 m (9.9') cable, single junction,
glass body
HI 1110T Screwcap PG13.5 connector, double junction, glass
body
HI 1114S Screw connector, double junction, plastic body
HI 1134B/3 BNC connector, 3 m (9.9') cable, double junction
plastic body
HI 1115S Screw connector, single junction, glass body
HI 1135B/3 BNC connector, 3 m (9.9') cable, single junction,
glass body
43
HI 1210T Screwcap PG13.5 connector, double junction, plas-
tic body
HI 1910B BNC connector, 1 m (3.3') cable, double junction,
plastic body, built-in amplifier
HI 1911B BNC connector, 1 m (3.3') cable, double junction,
plastic body, built-in amplifier
HI 1912B BNC connector, 1 m (3.3') cable, double junction,
plastic body, built-in amplifier
HI 1912B/5 BNC connector, 5 m (16.5') cable, double junction,
plastic body, built-in amplifier
HI 2114B/5 BNC connector, 5 m (16.5') cable, double junction,
plastic body
HI 2910B/5 BNC connector, 5 m (16.5') cable, double junction,
plastic body, built-in amplifier
44
ORP ELECTRODES
HI 2930B/5 BNC connector, 5 m (16.5') cable, Pt, plastic body,
built-in amplifier
HI 3110S Screw connector, Pt, glass body
HI 3130B/3 BNC connector, 3 m (9.9') cable, Pt, glass body
HI 3110T Screwcap PG13.5 connector, Pt, glass body
HI 3115S Screw-type connector, side-arm, Pt, glass body
HI 3135B/3 BNC connector, 3 m (9.9') cable, side-arm, Pt, glass
body
HH
II
3115S3115S
H
I
3115S
HH
II
3115S3115S
HH
II
H
I
HH
II
3135B/33135B/3
3135B/3
3135B/33135B/3
HI 3210T Screwcap PG13.5 connector, Pt, plastic body
HI 3410S Screw connector, Pt, plastic body
HI 3430B/3 BNC connector, 3 m (9.9') cable, Pt, plastic body
45
HI 3932B/5 BNC connector, 5 m (16.5') cable, Pt, plastic body,
built-in amplifier
HI 4110S Screw connector, Au, glass body
HI 4130B/3 BNC connector, 3 m (9.9') cable, Au, glass body
HI 4932B/5 BNC connector, 5 m (16.5') cable, Au, plastic body,
built-in amplifier
OTHER ACCESSORIES
HI 98501
HI 8614 pH transmitter (0.00 to 14.00 pH range)
HI 8614L pH transmitter with display (0.00 to 14.00 pH range)
HI 8614-01 pH transmitter (-2.00 to 16.00 pH range)
HI 8614L-01 pH transmitter with display (-2.00 to 16.00 pH range)
HI 8615 ORP transmitter (±1000 mV range)
HI 8615L ORP transmitter with display (±1000 mV range)
HI 8615-01 ORP transmitter (±1999 mV range)
HI 8615L-01 ORP transmitter with display (±1999 mV range)
BL PUMPS Dosing pumps with flow rate from 1.5 to 20 lph
HI 7871 & HI 7873 Level controllers
HI 6050 & HI 6051 Submersible electrode holders
HI 6054 & HI 6057 Electrode holders for in-line applications
ChecktempC
and 0.1°C resolution (-50.0 to 150.0°C)
thermometer with penetration probe
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.
46
HI 778P Coaxial cable and connectors for screw-type electrodes
HI 8427 pH/ORP electrode simulator with 1 m (3.3')
coaxial cable ending with female BNC connectors
(HI 7858/1)
HI 931001 pH/ ORP electrode simulator with display and 1 m
(3.3') coaxial cable ending with female BNC
connectors (HI 7858/1)
RECOMMENDATIONS FOR USERS
Before using these products, make sure they are entirely suitable for
the environment in which they are used.
Operation of these instruments in residential areas could cause
unacceptable interferences to radio and TV equipment, requiring the
operator to follow all necessary steps to correct interferences.
The trimmers are sensitive to electrostatic discharges. It is recommended
to use antistatic screwdrivers.
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 24 VAC or 60 VDC.
To avoid damage or burns, do not perform any measurement in
microwave ovens.
HANNA instruments reserves the right to modify the design, construction and
appearance of its products without advance notice.
47
Hanna Instruments Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket, RI 02895 USA
Local Sales and Customer Service office
Hanna Instruments United States Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket, RI 02895 USA
Tel. (800) 426 6287
Fax (401) 765 7575
www.hannainst.com/usa
Technical Support for customers
Telephone (800) 426 6287
Fax (401) 765 7575
E-mail tech@hannainst.com
Printed in Romania, EU MAN8711 09/09
48
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