Hanna Instruments HI 8711 User 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
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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.
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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.
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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.
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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"
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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
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