Hanna Instruments HI 9912 User Manual

Instruction Manual

HI 9912

Wall Mounted

Dual pH/ORP

Controller

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Compliance with the CE Directives

These Instruments are in

Dear Customer,
Thank you for choosing a Hanna Product.
Please read this instruction manual carefully before using the instru-

ment. This manual will provide you with the necessary information for
a correct use of the instrument, as well as a more precise idea of its
versatility. If you need more technical information, do not hesitate to
e-mail us at [e-mail].

These instruments are in compliance with the directives.

TABLE OF CONTENTSTABLE OF CONTENTS

TABLE OF CONTENTS

TABLE OF CONTENTSTABLE OF CONTENTS

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

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

MECHANICAL LAYOUTS................................................................. 4

FUNCTIONAL DIAGRAM ................................................................ 6

CONNECTIONS & WIRING ............................................................ 9

NORMAL OPERATION & MEASUREMENT .....................................12

pH CALIBRATION ....................................................................... 13

ORP CALIBRATION ..................................................................... 14

ADJUSTEMENT OF SETPOINT(S) .................................................. 15

PROPORTIONAL CONTROL.......................................................... 15

OVERDOSAGE TIMERS ................................................................ 17

pH VALUES AT VARIOUS TEMPERATURES ................................... 18

REDOX MEASUREMENT ............................................................... 19

ELECTRODE CONDITIONING & MAINTENANCE ............................... 20

SUGGESTED INSTALLATIONS FOR pH/ORP ELECTRODES ............... 21

ACCESSORIES ............................................................................. 22

WARRANTY ................................................................................ 25

OTHER PRODUCTS FROM HANNA ............................................... 26

CE DECLARATION OF CONFORMITY.............................................. 27

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, notify your Dealer.

Note: Save all packing materials until you are sure that the

instrument functions correctly. Any defective item must be
returned in the original packaging together with the supplied
accessories.

IMPORTANT:

1. Read the instructions before using the instrument.

2. The instrument should be connected to a mains socket.

3. Never install the controller outdoors, in a wet or humid area or
under direct sun light. Nor install the controller where liquids may
be sprayed or poured on it.

4. The instrument’s main power line as well as the dosage and
alarm terminals are protected by separate 2A fuses. Use only 2A
fuses for replacement.

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

Hanna's wall-mounted pH and ORP controller
control is designed to meet a variety of process control requirements,
especially those in swimming pools and water conditioning.

HI 9912 provides for two separate relays, one for pH and another for
ORP. In order to save on chemicals and due to the slow reaction of
oxidants, the controller incorporates a Consent feature by which ORP
measurements are adjusted only after pH has been corrected. The
Consent feature makes the pH correction the master and the ORP
adjustment the salve for a better control.

The electrodes can be installed quickly and easily. Simply plug the
universal BNC connectors into the sockets and twist them into a
secured position. Accurate measurements are displayed on large
LCD’s.

In order to avoid electrical noise and interference, HI 9912 provides
for two ground probes (differential inputs.

The controllers come equipped with relays operating at a maximum of
2A (240V).

3

with proportional

The Hanna controllers incorporate a triple contact alarm system.
When activated, the alarm contacts will open or close, triggering the
mechanism of your choice, whether a buzzer, light or any other
electrical device.

The controller is housed in a rugged, modular, fiber-reinforced ABS
housing.

All models can be wired to work with 110/115V or 220/240V
50/60 Hz power supplies.

MECHANICAL LAYOUTSMECHANICAL LAYOUTS

MECHANICAL LAYOUTS

MECHANICAL LAYOUTSMECHANICAL LAYOUTS

ELECTRODE WITH
BNC CONNECTION

MATCHING PIN FOR GROUND PROBE

WIRING ACCESS

PORTS

Fig. 1

Figure 1 illustrates the connectors for electrodes and the wiring access
ports.

MATCHING PIN

LCD DISPLAY

CALIBRATION

TRIMMERS

CONTROL KNOBS

AND SWICHES

pH

0.5 1.5

0

ORP

mV

50 150

0

OFFSET SLOPE

pH
PROPORTIONAL SETTINGS

CAL

mV

PROPORTIONAL SETTINGS

HI 9912

pH

pH

ALARM

1

FEED

ACID

7

0

2

ALARM

ON

OFF

2.0

0

SECONDS

OFF

200

0

SECONDS

100

8

6

ALARM

SET

0

200

2.557.5

mV

10

1

90

MINUTES
TIMER

ALARM

ALARM

mV

FEED

OXID

700

SET pH

ON

900

500

SET ORP

ALARM

SET

2.557.5

90

10

1

MINUTES

LINE

TIMER

OUTPUT TERMINALS

ALARM CONTACTS

DOSING TERMINALS

POWER SUPPLY

TERMINALS

Fig. 2

Figure 2 illustrates the controls and terminals.

4

3.8“

96.9 mm
1“

25 mm

75 mm

Fig. 3

Figure 3 is a dimensioned, bottom view of the Wall Mounted
Controller. The modular design isolates the control circuitry from the
contacts making it possible to make the connections and then close
the compartment. Adjustments can then be made only in the control
area, without having to open the contacts compartment.

227.8 mm
9“

3“

7.4“

188.6 mm

221.8 mm

8.7“

6.9“

174.8 mm

Fig. 4

Figure 4 is a dimensioned front view of the Wall Mounted Controller.
The molded, mounting holes in the corners provide for quick and
secure installation. No additional hardware is needed for mounting.
All electrical connections and controls are located on the front of the
instrument so that adjustment can be made without having to
remove the unit.

5

FUNCTIONAL DIAGRAM HI 9912FUNCTIONAL DIAGRAM HI 9912

FUNCTIONAL DIAGRAM HI 9912

FUNCTIONAL DIAGRAM HI 9912FUNCTIONAL DIAGRAM HI 9912

FRONT PANEL

Left panel

13

1

2

3
4
5
6
7
8

9

2

4

10

11

12

pH

OFFSET SLOPE

0.5 1.5

0

pH
PROPORTIONAL SETTINGS

ORP

mV

CAL

50 150

0

mV

PROPORTIONAL SETTINGS

2.0

200

HI 9912

pH

ACID

ON

6

ALARM

OFF

2.557.5

1

90

0

SECONDS

MINUTES

TIMER

mV

OXID

ON

500

ALARM

OFF

2.557.5

90

1

0

SECONDS

MINUTES

TIMER

pH

ALARM

1

FEED

7

0

2

ALARM

100

8

SET

0

200

mV

10

ALARM

ALARM

FEED

700

SET pH

900

SET ORP

SET

10

LINE

14

15

16

17
18

19

20

21

8

22

1. Alarm LED signal for pH

2. Liquid Crystal Displays for pH and ORP

3. Acid feed LED and dial to adjust the pH setpoint

4. Alarm disable switches for pH and ORP

5. Slope calibration trimmer for pH

6. Offset calibration trimmer for pH

7. Proportional pH band and time cycle settings

8. Two independent maximum dosage timers

9. Alarm LED for mV (ORP)

10. Calibration trimmer for mV

11. Oxidant feed LED and dial to adjust the ORP setpoint

12. Proportional mV band and time cycle settings

Right panel

13. pH alarm setting from 0 to 2 pH

14. Short the terminals if a pH ground probe is not in use, or
connect the ground probe wire to the Matching Pin terminal

15. Short the terminals if an ORP ground probe is not in use, or
connect the ground probe wire to the Matching Pin terminal

16. ORP alarm setting from 0 to 200 mV

6

17. Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position

18. Powered dosage terminals for pH correction

19. Powered dosage terminals for ORP correction

20. 110/115V or 220/240V power configuration

21. Incoming power terminals

22. Fuses

BOTTOM VIEW

23

24

25

26

23. Female BNC connector for a combination pH electrode

24. 4-mm Banana socket for the pH ground probe

25. Female BNC connector for a combination ORP electrode

26. 4-mm Banana socket for the ORP ground probe

Unplug the instrument from the power supply before
wiring or replacing the fuses.

7

Specifications HI 9912

RANGE 0.00 to 14.00 pH and 0 to 1000 mV

RESOLUTION 0.01 pH and 1mV
ACCURACY ±0.02 pH and ±5 mV

(@20°C/68°F)

TYPICAL EMC ±0.1 pH and ±6 mV
DEVIATION

CALIBRATION Through "OFFSET" and "SLOPE" trimmers for pH and

SETPOINT RANGE From 6 to 8 pH and 500 to 900 mV

PROPORTIONAL Two independent controls: pH from 0.0 to 2.0 and
CONTROL ORP from 0 to 200 mV with two separate time cycle

ALARM Relay can be configured as normally open or normally
CONTACT closed (isolated output Max. 2A, Max. 240V, resistive

2 pH), and/or ORP varies by more than the user
selectable interval (0 to 200 mV) from the setpoints or
due to overdosage

DOSING
TERMINALS

POWER SUPPLY 220/240V or 110/115V at 50/60Hz
ENVIRONMENT -10 to 50°C (14 to 122°F)

WEIGHT 1.6 Kg (3.5 lb.)
ENCLOSURE 181 x 221 x 142mm (7.1 x 8.7 x 5.6")

CASE MATERIAL Fiber-reinforced, self-extinguishing ABS

load, 1,000,000 strokes). The alarm is activated if pH
varies by more than the user-selectable interval (0 to

Two sets of independent terminals (115 to 240V,
Max.2A, 1,000,000 strokes) are activated whenever
pH exceeds the pH setpoint or when ORP falls below
the mV setpoint

“CAL” for ORP

from 0 to 90 seconds

max. 95% RH non-condensing

8

CONNECTIONS & WIRINGCONNECTIONS & WIRING

CONNECTIONS & WIRING

CONNECTIONS & WIRINGCONNECTIONS & WIRING

GENERAL POINTS

relay terminalsrelay terminals

• The

relay terminals of the controller are

relay terminalsrelay terminals
simply hook up your pumps or electrovalves directly to the
controller and do not need additional power supply.

• Unscrew the 4 screws on the right hand panel and remove the
cover and the gasket. Thread the wires through the access ports
on the right hand side of the controller.

BeforeBefore

•

connecting the controller to the mains, wire connecting the controller to the mains, wire

Before

connecting the controller to the mains, wire

BeforeBefore

connecting the controller to the mains, wire connecting the controller to the mains, wire

the controller completelythe controller completely

the controller completely and make all the connections for

the controller completelythe controller completely
pumps, alarm, electrode, set the alarm threashold and adjust
the settings. Upon completion

replace the coverreplace the cover

replace the cover. Only then

replace the coverreplace the cover

connect the controller to the power supply.

poweredpowered

powered. You can

poweredpowered

ELECTRODE & GROUND PROBE CONNECTIONS

ELECTRODE WITH
BNC CONNECTION

MATCHING PIN FOR GROUND PROBE

WIRING ACCESS

PORTS

• Simply attach any combination pH and ORP electrode with a
male BNC connector (such as HI 1002/3 and HI 2002/3) to the
female BNC sockets located on the bottom of the casing and twist
them into a secure position.

• HI 9912 also provides for Ground Probes (differ­ential input) to reduce electrical noise and
interference. The controller is shipped with the
Matching Pin and Reference terminals shorted (see 14 and 15 ­Functional Diagram). If you are not using a matching pin
(ground probe),
next two paragraphs.

• It is recommended that only electrodes that incorporate a match­ing pin (such as HI 1003/3 and HI 2003/3) are utilized. In this
case simply
matchingmatching

matching

matchingmatching
connectors on the outer casing (see 24 and 26 - Functional

leave the terminals shortedleave the terminals shorted

leave the terminals shorted and skip the

leave the terminals shortedleave the terminals shorted

attach the 4-mm banana connectors of theattach the 4-mm banana connectors of the

attach the 4-mm banana connectors of the

attach the 4-mm banana connectors of theattach the 4-mm banana connectors of the

pins to the sockets pins to the sockets

pins to the sockets located next to the BNC

pins to the sockets pins to the sockets

9