Hanna Instruments HI 8720 Owner's manual

1

www.hannainst.com

Panel Mounted

pH and ORP

Indicators and

Controllers

HI8510 • HI8512

HI8710 • HI8711

HI8720

Instruction Manual

2

PRELIMINARY EXAMINATION ..................................................................... 3

GENERAL DESCRIPTION ............................................................................. 3

MECHANICAL DIMENSIONS ....................................................................... 4

FUNCTIONAL DESCRIPTION HI8510 .......................................................... 5

FUNCTIONAL DESCRIPTION HI8512 .......................................................... 7

FUNCTIONAL DESCRIPTION HI8710 .......................................................... 9

FUNCTIONAL DESCRIPTION HI8711 ........................................................ 12

FUNCTIONAL DESCRIPTION HI8720 ........................................................ 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

Dear Customer,

Thank you for choosing a Hanna Instruments product.

Please read this instruction manual carefully before using these instru‑

ments.

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 [email protected] or view our worldwide contact list at www.

hannainst.com.

TABLE OF CONTENTS

WARRANTY

HI8510, HI8512, HI8710, HI8711 and HI8720 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 your local Hanna Instruments Office. 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 instru‑

ment 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.

3

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, please contact your local Hanna

Instruments Office.

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.

HI8510 and HI8512 pH and ORP panel‑mounted indicators, and

HI8710, HI8711 and HI8720 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 ‑ HI8710; OXID, REDUC ‑ HI8720) and the

possibility to set dosing action mode (OFF/AUTO/ON).

PRELIMINARY EXAMINATION

GENERAL DESCRIPTION

4

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.

MECHANICAL DIMENSIONS

5

FRONT PANEL

Keypad

SENSOR TEST To display the mV reading of the electrode and,

therefore, verify its working condition

pH7 TEST To verify the internal circuit of the meter in terms

of Offset compensation

pH4 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

FUNCTIONAL DESCRIPTION HI8510

6

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

REAR PANEL HI8510

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.

7

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

FRONT PANEL

FUNCTIONAL DESCRIPTION HI8512

8

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

REAR PANEL HI8512

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.

9

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

∆ALARM To display & set alarm tolerance

pH7 TEST To verify Offset compensation

pH4 TEST To verify amplifier circuit

Note: Each time a key is pressed the corresponding LED is turned ON

or changes its blinking behavior (∆ALARM).

Trimmers

OFFSET For Offset calibration

SLOPE For Slope calibration

∆ALARM To set the alarm tolerance

SET/COARSE To coarsely adjust the setpoint

SET/FINE To finely adjust the setpoint

FRONT PANEL

FUNCTIONAL DESCRIPTION HI8710

10

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 selec‑

tion

• ON ‑ dosing always active

LEDs

ACID (blinking) Shows that acid dosage is

active

ALK. (blinking) Shows that alkaline dosage is

active

∆ALARM (blinking) Indicates an active alarm

11

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)

REAR PANEL HI8710

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.

12

∆ALARM To display and set the alarm tolerance

pH7 TEST To verify Offset compensation

pH4 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,

∆ALARM).

Keypad

ALK. SET To set the working point of basic dos‑

age

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

FRONT PANEL

FUNCTIONAL DESCRIPTION HI8711

13

Trimmers

SLOPE For Slope calibration

OFFSET For Offset calibration

∆ALARM 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

∆ALARM (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.

14

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)

REAR PANEL HI8711

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.

15

Keypad

SET To set the working point of ORP dosage

MEASURE To enter measurement mode and to enable

diagnostic tests

∆ALARM 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 (∆ALARM).

FRONT PANEL

FUNCTIONAL DESCRIPTION HI8720

16

Trimmers

CAL For ORP calibration

∆ALARM 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

∆ALARM (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

17

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)

REAR PANEL HI8720

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.

18

HI8510

HI8512

SPECIFICATIONS

INPUT Electrode Transmitter

RANGE 0.00 to 14.00 pH

RESOLUTION 0.01 pH

ACCURACY

(@25 °C/77 °F)

±0.02 pH (0 to 100 °C)

±0.05 pH (‑20 to 0 °C)

±0.5%

INPUTS

High impedance 10

12

Ohm;

Reference and Matching pin inputs

are available

4 to 20 mA

POWER OUTPUT ±5 Vcc; 150 mA max load for amplified electrodes

CALIBRATION

Offset: ±2 pH with OFFSET trimmer;

Slope: 80 to 110% with SLOPE trimmer

TEMPERATURE

COMPENSATION

Fixed or automatic with Pt100 from ‑20 to 100 °C (‑4 to 212 °F)

RECORDER OUTPUT 0‑20 mA or 4‑20 mA (isolated)

BACKLIGHT Continuous ON

POWER SUPPLY 115 or 230 Vac; 60/50 Hz

ENCLOSURE

Black anodized aluminum body; front and back with ABS;

transparent splash‑proof front cover

ENVIRONMENT ‑10 to 50 °C (14 to 122 °F); RH max 95% non condensing

PANEL CUTOUT 141 x 69 mm (5.6 x 2.7”)

WEIGHT 1 kg (2.2 lb.)

INPUT Electrode Transmitter

RANGE ±1000 mV

RESOLUTION 1 mV

ACCURACY

(@25 °C/77 °F)

±5 mV ±0.5%

INPUTS

High impedance 10

12

Ohm;

Reference and Matching pin inputs

are available

4 to 20 mA

POWER OUTPUT ±5 Vcc; 150 mA max load for amplified electrodes

CALIBRATION Offset: ±200 mV with CAL trimmer

RECORDER OUTPUT 0‑20 mA or 4‑20 mA (isolated)

BACKLIGHT Continuous ON

POWER SUPPLY 115 or 230 Vac; 60/50 Hz

ENCLOSURE

Black anodized aluminum body; front and back with ABS; transparent

splash‑proof front cover

ENVIRONMENT ‑10 to 50 °C (14 to 122 °F); RH max 95% non condensing

PANEL CUTOUT 141 x 69 mm (5.6 x 2.7”)

WEIGHT 1 kg (2.2 lb.)

19

HI8710

HI8711

INPUT Electrode Transmitter

RANGE 0.00 to 14.00 pH

RESOLUTION 0.01 pH

ACCURACY

(@25 °C/77 °F)

±0.02 pH (0 to 100 °C)

±0.05 pH (‑20 to 0 °C)

±0.5%

INPUTS

High impedance 10

12

Ohm;

Reference and Matching pin inputs

are available

4 to 20 mA

POWER OUTPUT ±5 Vcc; 150 mA max load for amplified electrodes

CALIBRATION

Offset: ±2 pH with OFFSET trimmer;

Slope: 80 to 110% with SLOPE trimmer

TEMPERATURE

COMPENSATION

Fixed or automatic with Pt100 from ‑20 to 100 °C (‑4 to 212 °F)

RECORDER OUTPUT 0‑20 mA or 4‑20 mA (isolated)

SETPOINT RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

SETPOINT RANGE 0.00 to 14.00 pH

ALARM RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

∆ALARM RANGE 0.2 to 3.00 pH

CONSENT RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

BACKLIGHT Continuous ON

POWER SUPPLY 115 or 230 Vac; 60/50 Hz

ENCLOSURE

Black anodized aluminum body; front and back with ABS; transparent

splash‑proof front cover

ENVIRONMENT ‑10 to 50 °C (14 to 122 °F); RH max 95% non condensing

PANEL CUTOUT 141 x 69 mm (5.6 x 2.7”)

WEIGHT 1 kg (2.2 lb.)

INPUT Electrode Transmitter

RANGE 0.00 to 14.00 pH

RESOLUTION 0.01 pH

ACCURACY

(@25 °C/77 °F)

±0.02 pH (0 to 100 °C)

±0.05 pH (‑20 to 0 °C)

±0.5%

INPUTS

High impedance 10

12

Ohm;

Reference and Matching pin

inputs are available

4 to 20 mA

POWER OUTPUT ±5 Vcc; 150 mA max load for amplified electrodes

CALIBRATION

Offset: ±2 pH with OFFSET trimmer;

Slope: 80 to 110% with SLOPE trimmer

TEMPERATURE

COMPENSATION

Fixed or automatic with Pt100 from ‑20 to 100 °C (‑4 to 212 °F)

20

HI8720

RECORDER OUTPUT 0‑20 mA or 4‑20 mA (isolated)

SETPOINT RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

SETPOINT RANGE 0.00 to 14.00 pH

ALARM RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

∆ALARM RANGE 0.2 to 3.00 pH

DOSING CONTROL OFF/AUTO/ON with selection switch

OVER DOSING

CONTROL

Adjustable, from 5 min to 60 min with knob or Disable by wire strap ‑ on

rear panel

BACKLIGHT Continuous ON

POWER SUPPLY 115 or 230 Vac; 60/50 Hz

ENCLOSURE

Black anodized aluminum body; front and back with ABS;

transparent splash‑proof front cover

ENVIRONMENT ‑10 to 50 °C (14 to 122 °F); RH max 95% non condensing

PANEL CUTOUT 141 x 69 mm (5.6 x 2.7”)

WEIGHT 1 kg (2.2 lb.)

INPUT Electrode Transmitter

RANGE ±1000 mV

RESOLUTION 1 mV

ACCURACY

(@25 °C/77 °F)

±5 mV ±0.5%

INPUTS

High impedance 10

12

Ohm;

Reference and Matching pin inputs

are available

4 to 20 mA

POWER OUTPUT ±5 Vcc; 150 mA max load for amplified electrodes

CALIBRATION

Offset: ±2 pH with OFFSET trimmer;

Slope: 80 to 110% with SLOPE trimmer

RECORDER OUTPUT 0‑20 mA or 4‑20 mA (isolated)

SETPOINT RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

SETPOINT RANGE 0.00 to 14.00 pH

ALARM RELAY 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

∆ALARM RANGE 10 to 300 mV

DOSING CONTROL 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)

OVER DOSING

CONTROL

Adjustable, from 5 min to 60 min with knob or Disable by wire strap ‑ on

rear panel

BACKLIGHT Continuous ON

POWER SUPPLY 115 or 230 Vac; 60/50 Hz

ENCLOSURE

Black anodized aluminum body; front and back with ABS; transparent

splash‑proof front cover

ENVIRONMENT ‑10 to 50 °C (14 to 122 °F); RH max 95% non condensing

PANEL CUTOUT 141 x 69 mm (5.6 x 2.7”)

WEIGHT 1 kg (2.2 lb.)

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