Instruction Manual
HI 9912
Wall Mounted
Dual pH/ORP
Controller
H
I 9
9
p
H
ACID
O
F
F
S
E
T
0
.
5
1
.
5
0
2
.
p
0
H
P
R
O
P
O
R
T
I
O
ORP
mV
C
A
L
5
0
1
5
0
0
2
m
0
V
0
P
R
O
P
O
R
T
I
O
3
S
L
O
P
E
O
N
2
S
A
E
L
T
A
R
M
O
F
F
5
2
.5
7
.
5
0
S
9
E
0
C
O
N
N
A
L
D
S
S
E
T
T
1
I
N
G
S
M
1
0
I
N
U
T
E
S
pH
T
I
M
E
R
mV
A
L
R
D
X
F
E
3
0
0
1
0
0
ON
5
0
S
E
T
A
L
A
R
M
OFF
2
.
5
5
0
N
A
L
7
.
5
S
E
9
C
0
O
N
S
D
E
S
T
T
I
N
1
G
S
M
1
I
N
0
U
T
E
O
S
R
P
T
I
M
E
R
http://www.hannainst.com
pH
1
0
2
ALAR
M
100
0
200
m
V
A
L
A
R
M
S
E
T
p
H
S
E
T
O
R
P
L
IN
E
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 tech@hannainst.com.
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
Diagram) and
remove the jumpersremove the jumpers
remove the jumpers shorting the matching
remove the jumpersremove the jumpers
pin terminals.
• When using a separate probe for grounding purposes, wire it to
the Matching Pin terminals on the right hand panel and
remove the jumpersremove the jumpers
remove the jumpers (see 14 and 15 - Functional Diagram).
remove the jumpersremove the jumpers
NOTE:
NEVER leave the jumper in when
using an electrode with a match-
REMOVE WHEN
USING MATCHING PIN
ing pin. This can shorten the life
of the electrode (reference) drastically.
RELAY CONNECTIONS
• Wire the external devices (pumps or electrovalves) directly to the
relay terminal strips of the controller (see 18 and 19 - Functional
Diagram). The
terminals areterminals are
terminals are
terminals areterminals are
poweredpowered
powered and
poweredpowered
do not do not
hence you
do not
do not do not
need an ex-need an ex-
need an ex-
need an ex-need an external powerternal power
ternal power
ternal powerternal power
supplysupply
supply for the
supplysupply
pumps or valves.
NOTE:
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
ORP measurements are adjusted only after pH has been corrected.
The Consent feature makes the
ORP adjustmentORP adjustment
ORP adjustment the
ORP adjustmentORP adjustment
salvesalve
salve for a better control.
salvesalve
pH
OFFSET SLOPE
0.5 1.5
0
ORP
mV
50 150
0
2.0
pH
PROPORTIONAL SETTINGS
CAL
200
mV
PROPORTIONAL SETTINGS
ON
OFF
0
90
SECONDS
ON
OFF
0
SECONDS
HI 9912
pH
pH
ALARM
1
ACID
FEED
7
0
2
ALARM
100
8
6
ALARM
SET
0
200
2.557.5
mV
10
1
MINUTES
TIMER
ALARM
ALARM
mV
OXID
FEED
700
SET pH
900
500
SET ORP
ALARM
SET
2.557.5
90
10
1
MINUTES
LINE
TIMER
Consent featureConsent feature
Consent feature by which
Consent featureConsent feature
pH correctionpH correction
pH correction the
pH correctionpH correction
BL DOSING
PUMPS
mastermaster
master and the
mastermaster
ALARM CONNECTIONS
• The operator can select an alarm threshold of 0.0
to 2.0 pH and 0 to 200 mV by turning the alarm
knob (see 13 and 16 of Functional Diagram). The
alarm can be selected as normally closed ("NC") by
connecting the external device to the C and NC
terminals or normally open ("NO") by connecting
the external device to the C and NO terminals.
10
0
ALARM
0
pH
1
2
100
200
mV
• If the actual measurements are above or below the setpoints by
a margin greater than the user-selectable alarm threshold, the
alarm terminal is activated, triggering the mechanism of your
choice. The alarm LED lights also come on. Due to the
featurefeature
feature, if the pH is in alarm, both the pH and ORP relays will
featurefeature
ConsentConsent
Consent
ConsentConsent
be disactivated. However, if only ORP is in an alarm condition,
only the ORP relay will be disactivated.
HI 9912
pH
pH
ALARM
1
ACID
FEED
pH
7
0
2
ALARM
100
ON
0.5 1.5
0
ORP
mV
50 150
0
OFFSET SLOPE
CAL
mV
2.0
pH
PROPORTIONAL SETTINGS
200
PROPORTIONAL SETTINGS
8
6
ALARM
SET
0
200
OFF
2.557.5
mV
10
1
0
90
SECONDS
MINUTES
TIMER
ALARM
ALARM
mV
OXID
FEED
700
SET pH
ON
900
500
SET ORP
ALARM
SET
OFF
2.557.5
90
10
1
0
SECONDS
MINUTES
LINE
TIMER
• The alarm ON/OFF switch is only to
alarm terminalalarm terminal
alarm terminal (e.g. the buzzer will not sound).
alarm terminalalarm terminal
However, all other functions such as disactivation of
EXTERNAL ELECTRICAL
DEVICE ACTIVATED BY
AN ALARM CONDITION
disable the disable the
disable the
disable the disable the
ON
ALARM
OFF
the dosing relays remain unvaried.
• If the pH ON/OFF switch is in the off position, the buzzer/light
will not come on when the pH value is out. The alarm will be
sounded for ORP, unless likewise, the ORP switch is in the off position.
• The controller provides for
automatic fail-safe automatic fail-safe
automatic fail-safe security
automatic fail-safe automatic fail-safe
by
activating the alarm if there is a power failure, regardless of
whether the NC or NO configurations were chosen.
• The alarm is also activated if one or both of
the independent overdosage times are exceeded. The maximum time that the relay
contacts remain active continuously (overdos-
5
2.5
1
MINUTES
ALARM DOSING TIME
7.5
10
age timers) can be set from 1 to 10 minutes.
• Once in an alarm condition, the alarm contact remain activated
until the switch is manually put in the off position or the
measurements return to normal values.
MAIN POWER SUPPLY CONNECTION
BeforeBefore
•
• For 220-240V, short the L1 and N1 termi-
connecting the unit to the mains, make sure connecting the unit to the mains, make sure
Before
connecting the unit to the mains, make sure
BeforeBefore
connecting the unit to the mains, make sure connecting the unit to the mains, make sure
that the controller is completely wiredthat the controller is completely wired
that the controller is completely wired and that all
that the controller is completely wiredthat the controller is completely wired
connections for pump, alarm, electrode, etc. have been made.
nals. Then wire the external power supply
to the three terminals.
11
• For 110-115V, short the L and L1 terminals. Then wire the external power supply
to the three terminals as shown.
• Replace the cover with the gasket and
screw it tight with the 4 screws provided.
Only thenOnly then
Only then connect the controller to the mains.
Only thenOnly then
NORMAL OPERATION &NORMAL OPERATION &
NORMAL OPERATION &
NORMAL OPERATION &NORMAL OPERATION &
MEASUREMENTMEASUREMENT
MEASUREMENT
MEASUREMENTMEASUREMENT
Make sure that the controller has been properly calibrated before
commencing and that the pH and ORP setpoint(s) have been
adjusted (see the following pages).
The pH and ORP electrodes and any ground probes must be properly
connected and wired to the controller (see preceding pages).
Remove the protecteive caps if they are still on the tip of the electrodes
and ensure that the electrodes are immersed in the solution (at least
4cm/1.5”). The electrodes should be installed in such a away that they
pH
8.00
permanently lie in the solution whether in
a well, tank or on the discharge pipe.
The actual pH and ORP values will be
displayed on the LCD’s.
ORP
mV
650
HI 9912 provides for visual dosing status through two LED’s, one for
pH and another for ORP. The LED’s light up when the controller is in
the pH or ORP dosage mode and the terminals are activated.
ACID
pH
ALARM
FEED
7
OXID
mV
ALARM
FEED
700
SET
8
500
6
SET
900
NOTE:
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 featureConsent feature
Consent feature by which
Consent featureConsent feature
ORP measurements are adjusted only after pH has been corrected.
The Consent feature makes the
ORP adjustmentORP adjustment
ORP adjustment the
ORP adjustmentORP adjustment
salvesalve
salve for a better control.
salvesalve
pH correctionpH correction
pH correction the
pH correctionpH correction
12
mastermaster
master and the
mastermaster
4cm
(1½")
HI 7007
4cm
(1½")
HI 7007
4cm
(1½")
HI 7007
pH pH
CALIBRATIONCALIBRATION
pH
CALIBRATION
pH pH
CALIBRATIONCALIBRATION
Make sure that the pH electrode and any ground probe have been
properly connected and wired to the controller (see preceding pages)
and that the meter is plugged to the mains.
Calibration should be performed at a temperature similar to that of the liquid to be
monitored.
Use a Checktemp (or an accurate thermometer) as reference. Remove the electrode cap if
it is still on the electrode.
During calibration, move the electrode and the
separate ground probe (if in use) together
from one buffer to the next.
If no separate ground probe is being used, make sure that
the Reference and the Matching Pin terminals are shorted
(see 14 - Functional Diagram).
If the electrode (such as HI 1003/3) incorporates a ground probe
(matching pin) then remove the jumper.
OFFSET ADJUSTMENT:
• Rinse the tip of the electrode with pH 7.01 solution (HI 7007),
then dip the bottom 4 cm (1.5”) of the
electrode (and ground probe) in the pH
7.01 buffer.
• Place the Checktemp thermometer in the
buffer solution.
• Wait for the measurement to stabilize and then adjust the
"OFFSET" trimmer (see 6 - Functional Diagram) to display
pH 7.01 on the LCD if the tem-
pH
7.01
OFFSET SLOPE
ON
ALARM
OFF
perature of the buffer solution is
at 25°C (77°F).
• If the temperature of the buffer solution is not 25°C (77°F), refer
to the chart at the end of the manual for the appropriate buffer
value at a given temperature.
13
SLOPE ADJUSTMENT:
• Rinse the electrode (and ground probe)
thoroughly with water and immerse
the bottom 4 cm (1.5”) in a pH
10.01 (HI 7010) or a pH 4.01 (HI
7004) buffer solution.
HI 7010
• Stir the electrode and wait for the display to stabilize before
adjusting the "SLOPE" trimmer (see 5 - Functional
Diagram) to display pH
10.01 (or 4.01) on the LCD
if the temperature of the
pH
10.01
OFFSET SLOPE
buffer solution is at 25°C
(77°F). Otherwise, refer to
the chart at the end of the
manual for the buffer value and adjust the trimmer accordingly.
The pH calibration is now complete.
ORP CALIBRATIONORP CALIBRATION
ORP CALIBRATION
ORP CALIBRATIONORP CALIBRATION
Make sure that the ORP electrode and any ground probe have been
properly connected and wired to the controller (see preceding pages)
and that the meter is plugged to the mains.
Remove the electrode cap if it is still on the electrode.
During calibration, introduce both the electrode and the separate
ground probe (if in use) to the known solution. If no separate ground
probe is being used, make sure that the Reference
and the Matching Pin terminals are shorted (see
15 - Functional Diagram).
If the electrode (such as HI 2003/3) incorporates a ground probe
(matching pin) then remove the jumper.
• Immerse the electrode in a HI 7020
(or another known) ORP
solution and wait until the reading stabilizes.
• Adjust the CAL trimmer to 230 ±20 mV.
(1½")
4cm
ON
ALARM
OFF
HI 7020
(1½")
ORP
CAL
230
ON
ALARM
OFF
mV
4cm
14
ADJUSTEMENT OF SETPOINT(S)ADJUSTEMENT OF SETPOINT(S)
ADJUSTEMENT OF SETPOINT(S)
ADJUSTEMENT OF SETPOINT(S)ADJUSTEMENT OF SETPOINT(S)
Make sure that the electrode (and any ground probe) is properly
installed and calibrated (see the preceding pages).
pH
FOR pH
Simply turn the pH ACID FEED dial (see 3 - Func-
ACID
ALARM
FEED
7
tional Diagram) and choose the desired value between
6 and 8 pH.
6
DOSING DIRECTION
SET
The dosing terminals are activated when the pH value exceeds the
setpoint. HI 9912 will then dose acidic solutions until the user-selected
setpoint is reached.
ALARM
FOR ORP
Simply turn the ORP OXID FEED dial (see 11 -
OXID
mV
FEED
700
Functional Diagram) and choose the desired value
between 500 and 900 mV
DOSING DIRECTION
900
500
SET
The dosing terminals are activated when the ORP falls below the
setpoint. HI 9912 will dose oxidants until the user-selected setpoint is
reached.
PROPORTIONAL CONTROLPROPORTIONAL CONTROL
PROPORTIONAL CONTROL
PROPORTIONAL CONTROLPROPORTIONAL CONTROL
8
In order to optimize the controlling process and reduce the amount of
chemicals used, it is recommended to use a proportional dosage
appropriate for the system.
HI 9912 allows for a proportional
band of 0 to 2.0 pH and 0 to
200 mV (delta) as well as two
independent time cycles from 0 to
90 seconds. The proportional dosage is obtained by personalizing a
current pulse whose height equals
the pH or ORP proportional delta
0.5 1.5
0
pH
PROPORTIONAL SETTINGS
50 150
0
mV
PROPORTIONAL SETTINGS
2.0
090
SECONDS
200
0
SECONDS
90
and the length corresponds to the
selected time cycle.
The controller will enter
minus minus
minus (in case of ORP)
minus minus
proportional dosage at setpointproportional dosage at setpoint
proportional dosage at setpoint
proportional dosage at setpointproportional dosage at setpoint
or plus or plus
or plus (for pH)
or plus or plus
the preselected deltathe preselected delta
the preselected delta.
the preselected deltathe preselected delta
It will then keep the dosing relays activated for a period proportional
15
D pH
Seconds15 30 45
60
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
15 30 45 60
to the difference between the measurement less the setpoint over the
cycle.
NOTE:
• If the setting is left at 0 pH or 0 mV, the controller will operate
as an ON/OFF control with no proportional dosage. In this case
the controller will operate with a 0.1 pH or 7 mV hysteresis.
Do not set the time cycle to 0Do not set the time cycle to 0
•
Do not set the time cycle to 0. This causes the relay to chatter
Do not set the time cycle to 0Do not set the time cycle to 0
and can be detrimental to the controlling system and pump.
e.g. pH proportional control
Setpoint = 7.4 pH
Measured value = 8.90 pH
Delta = 8.90 - 7.40 = 1.50 pH
Proportional settings = pH set to 2 and time cycle to 60 seconds
The controller will be dosing
acids to reduce pH to the
desired limit. Since it is 1.50/
2.00 = 75% away from the
ideal setting, it will keep the
dosing relay activated for 75%
of the time over the predetermined 60 seconds. The
terminals are hence theoretically activated for 45 seconds
0.5 1.5
0
pH
PROPORTIONAL SETTINGS
D pH
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.0
090
SECONDS
60
15 30 45 60
Seconds15 30 45
and off for 15 seconds.
In order to avoid over dosage
of fast responding samples or
highly concentrated chemicals
or under dosage with slow
reacting or weak chemicals,
the controller provides even a
D pH
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
60
15 30 45 60
Seconds15 30 45
more accurate control.
As the graphs show, it does
that by stopping the dosage
as soon as the current pulse
curve intersects the dosage
curve. This means shortening
the dosage period if the chemicals have reacted quickly or lengthening it if the measured pH
continues to drift from the ideal setpoint as can be seen from the
graphs.
16
e.g. ORP proportional control
Setpoint = 750 mV
Measured value = 725 mV
Delta = 750 - 725 = 25 mV
Proportional settings = mV set to 100 and time cycle to 60 seconds
The controller will be dosing
50 150
oxidants to increase redox to
the desired value. Since it is
25/100 = 25% away from
the ideal setting, it will keep
the dosing contacts activated
for 25% of the time over the
predetermined 60 seconds.
The terminals are hence activated for 15 seconds and off
0
D mV
100
75
50
25
200
60
15 30 45 60
0
mV
PROPORTIONAL SETTINGS
SECONDS
Seconds15 30 45
90
for 45 seconds until the next
cycle.
OVERDOSAGE TIMERSOVERDOSAGE TIMERS
OVERDOSAGE TIMERS
OVERDOSAGE TIMERSOVERDOSAGE TIMERS
HI 9912 provides for two independent overdosage timers. The
operator can set the maximum amount of time that the dosage
terminals should continuously remain activated from 1 to 10 minutes . Should this
5
2.5
7.5
period elapse, the alarm terminals are activated (and dosage disactivated to ensure
that chemicals have not run out or pumps
1
MINUTES
ALARM DOSING TIME
10
or electrovalves have not ceased to function
properly).
17
pHpH
VALUES AT VARIOUS VALUES AT VARIOUS
pH
VALUES AT VARIOUS
pHpH
VALUES AT VARIOUS VALUES AT VARIOUS
TEMPERATURESTEMPERATURES
TEMPERATURES
TEMPERATURESTEMPERATURES
Please refer to the following chart for a more accurate pH calibration:
TEMP pH VALUES
°C °F 4.01 6.86 7.01 9.18 10.01
0
32
4.01
6.98
7.13
9.46
10.32
5
41
4.00
6.95
7.10
9.39
10.24
10
50
4.00
6.92
7.07
9.33
10.18
15
59
4.00
6.90
7.04
9.27
10.12
20
68
4.00
6.88
7.03
9.22
10.06
25
77
4.01
6.86
7.01
9.18
10.01
30
86
4.02
6.85
7.00
9.14
9.96
35
95
4.03
6.84
6.99
9.10
9.92
40
104
4.04
6.84
6.98
9.07
9.88
45
113
4.05
6.83
6.98
9.04
9.85
50
122
4.06
6.83
6.98
9.01
9.82
55
131
4.07
6.84
6.98
8.99
9.79
60
140
4.09
6.84
6.98
8.97
9.77
65
149
4.11
6.85
6.99
8.95
9.76
70
158
4.12
6.85
6.99
8.93
9.75
For instance, if the buffer temperature is 25°C (77°F), calibrate the
meter to read 4.01, 7.01 or 10.01 on the display.
If the buffer temperature is 20°C, calibrate it to 4.00, 7.03 or
10.06.
If the buffer temperature is 50°C, calibrate it to 4.06, 6.98 or 9.82.
18
REDOX MEASUREMENTREDOX MEASUREMENT
REDOX MEASUREMENT
REDOX MEASUREMENTREDOX MEASUREMENT
Redox measurements allow the quantification of the oxidizing or
reducing power of a solution, 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 a chemical reaction with the
elements with which it comes into contact.
The electrodes most usually available for this purpose have a platinum surface. 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 accurate redox measurements the surface of the electrode
must be clean and smooth. At certain mV and pH values, especially
those found in pools, the ORP electrode requires a considerable
amount of time before it reads the proper value. This is due to the
fact that it is moving from a reducing to an oxidizing state. Once it
reaches a stable condition though, it reacts rapidly to changes.
Hence when the process is first set up allow sufficient time for the ORP
electrode to adapt itself to the sample stream.
As with pH electrodes, gel-filled redox electrodes are more suitable for
industrial applications due to less maintenance requirements.
In order to test that the ORP electrode is functioning properly,
immerse it into a HI 7020 solution. The measured value should be
between 200 and 250 mV.
When not in use, the electrode tip should be kept moist in order for
the reference junction, especially Teflon models, to respond quickly.
Otherwise, soak the electrode overnight in a HI 70300 storage
solution or allow more time upon installation for its stabilization. Also
keep the electrode far from any type of mechanical stress which might
cause damage.
Install the electrode in such a way that it is constantly in a well filled
with the sample (stream or tank) and does not dry up.
19
The protective cap should also be filled with a few drops of HI 70300
storage solution if the electrode is not being used at all.
Note: With industrial applications, it is always good practice to keep
at least one spare electrode handy. When anomalies are not
resolved with a simple maintenance, change the electrode to
see if the problem is alleviated.
ELECTRODE CONDITIONINGELECTRODE CONDITIONING
ELECTRODE CONDITIONING
ELECTRODE CONDITIONINGELECTRODE CONDITIONING
& MAINTENANCE& MAINTENANCE
& MAINTENANCE
& MAINTENANCE& MAINTENANCE
PREPARATION
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 bubbles of air may have formed inside the glass
bulb (membrane). Shake down the electrode as you would do with a
glass thermometer to remove these bubbles.
If the bulb and/or junction are dry, soak the electrode in a HI 70300
Storage Solution overnight.
STORAGE
To minimize clogging and assure a quick response time, the glass
bulb and the junction should be kept moist and not allowed to dry
out. This can be achieved by installing the electrode in such a way
that it is constantly in a well filled with the sample (stream or tank).
When not in use, pour a few drops of HI 70300 Storage Solution or,
in its absence, HI 7007 pH 7.01 Buffer Solution in the protective cap
and replace it on the electrode.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED
WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for the connection
to the controller must be intact and there must be no points of broken
insulation on the cable or cracks on the electrode stem or bulb.
The connector must be clean and dry. If any scratches or cracks are
present, replace the electrode. Rinse off any salt deposits with water.
CLEANING PROCEDURE
Soak in Hanna HI7061 General Cleaning Solution for ½ hour.
20
For more specific cleaning procedures, refer to the electrode’s instruction manual.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water and recalibrate the
controller.
TROUBLESHOOTING
Evaluate your electrode performance based on the following.
• Noise (Readings fluctuate up and down) could be due to clogged/dirty junction: Refer to the Cleaning Procedure above.
• Dry Membrane/Junction: Soak in Storage Solution HI 70300
overnight. Check to make sure the installation is such as to create
a well for the electrode bulb to constantly remain moist.
• Low Slope: Refer to the cleaning procedure above.
• No Slope: - Check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found).
- Make sure cable and connections are not damaged nor lying in a pool of water or solution.
• Slow Response/Excessive Drift: Soak the tip in Hanna Solution HI 7061 for 30 minutes, rinse thoroughly with distilled
water and then recalibrate the meter.
• For ORP Electrodes: Polish the metal tip with a lightly abrasive
paper (paying attention not to scratch the surface) and wash
thoroughly with water.
Note: With industrial applications, it is always recommended to keep
at least one spare electrode handy. When anomalies are not
resolved with a simple maintenance, change the electrode
(and recalibrate the controller) to see if the problem is
alleviated.
SUGGESTED INSTALLATIONSSUGGESTED INSTALLATIONS
SUGGESTED INSTALLATIONS
SUGGESTED INSTALLATIONSSUGGESTED INSTALLATIONS
for pH/ORP ELECTRODESfor pH/ORP ELECTRODES
for pH/ORP ELECTRODES
for pH/ORP ELECTRODESfor pH/ORP ELECTRODES
The electrodes should be installed in such a away that they always lie
in the solution, whether in a well, tank or on the discharge pipe.
SHORT DISTANCE, INDOOR INSTALLATION
Due to the low currents involved, a very high grade of insulation is
required. A dry environment is needed in order to obtain a level of
insulation not lower than 10
12
Ω.
21
This type of connection is very delicate and requires constant attention
to maintain proper operating conditions.
The conventional electrodes may be used for indoor applications but
the cable length should not exceed 10 m (33').
MEDIUM DISTANCE, INDOOR/OUTDOOR INSTALLATION
When an outdoor installation is required, it is normally necessary to
install a transmitter to obtain accurate readings at distances from 10
to 50 m (33-165').
Since the introduction of AmpHel electrodes these distances are no
longer a problem. You can now connect your meter directly to an
AmpHel electrode, saving the cost of a transmitter.
The standard cable length of the AmpHel electrode is 5 m (16.5').
Additional lengths of regular cable up to 50 m (165'), can be
installed without special connectors. It is recommended to use coaxial
cables due to their excellent insulation, even though, Amphel electrodes can operate with both.
AmpHel electrodes have a micro-amplifier in the electrode cap to boost
the signal, drastically reducing susceptibility to noise and drift.
For more details about these or other specially made electrodes,
consult the Hanna process and water treatment literature, or call the
Hanna Office nearest to you.
ACCESSORIESACCESSORIES
ACCESSORIES
ACCESSORIESACCESSORIES
pH ELECTRODES
HI 1002/3 Double Teflon junction with external threads
HI 1003/3 Double Teflon junction with matching pin
HI 2911B/5 Preamplified, double Teflon junction
ORP (Pt) ELECTRODES
HI 2002/3 Double Teflon junction with external threads
HI 2003/3 Double Teflon junction with matching pin
HI 2931B/5 Preamplified, double Teflon junction
ORP (AU) ELECTRODES
HI 2012/3 Double Teflon junction with external threads
HI 2013/3 Double Teflon junction with matching pin
Hanna manufactures hundreds of pH and ORP electrodes for a wide
variety of process and water treatment applications. Consult the
22
specific handbooks for process instrumentation, or simply call the
Hanna office nearest to you for a complete list.
pH CALIBRATION SOLUTIONS
HI 7004L pH 4.01 buffer solution, 460 mL
HI 7007L pH 7.01 buffer solution, 460 mL
HI 7010L pH 10.01 buffer solution, 460 mL
ORP SOLUTIONS
HI 7020L 200-275mV ORP solution, 460 mL
HI 7092L Pretreatment oxidizing solution, 460 mL
ELECTRODE STORAGE SOLUTION
HI 70300L Storage solution, 460 mL
ELECTRODE CLEANING SOLUTIONS
HI 7061L General purpose cleaning solution, 460 mL
HI 7073L Protein cleaning solution, 460mL
OTHER ACCESSORIES
BL PUMPS Dosing pumps (several models are available with
flow rates from 1.5 to 18.3 lph / 0.4 to 4.8 gph)
ChecktempC Pocket-size thermometer (range -50.0 to 150.0°C)
ChecktempF Pocket-size thermometer (range -58.0 to 302.0°F)
HI 6050 Submersible electrode holder (605 mm/23.8" total
length)
HI 6051 Submersible electrode holder (1105 mm/43.5" total
length)
HI 6054B Electrode holder for in-line applications
HI 8427 pH and ORP Electrode Simulator and high imped-
ance tester with 1 m (3.3') Coaxial Cable ending in
a male BNC connector (HI 7858/1)
HI 931001 pH and ORP Electrode Simulator with LCD display
and 1 m (3.3') Coaxial Cable ending in a male BNC
connector (HI 7858/1)
23
24
WARRANTYWARRANTY
WARRANTY
WARRANTYWARRANTY
All Hanna controllers are warranted for two years against
defects in workmanship and materials when used for their intended
purpose and maintained according to instructions.
Damages due to accident, misuse, tampering or lack of prescribed
maintenance are not covered. This warranty is limited to free of
charge repair or replacement of the meter only, if any malfunctioning is due to manufacturing defects.
If service is required, contact the dealer from whom you purchased
the instrument. If under warranty, report the model number, date
of purchase, serial number and the nature of the failure. If the
repair is not covered by the warranty, you will be notified of the
charges incurred. If the instrument is to be returned to Hanna
Instruments, first obtain a Returned Goods Authorization Number
from the Customer Service department and then send it with
shipment costs prepaid. When shipping any instrument, make sure
it is properly packaged for complete protection.
To validate your warranty, fill out and return the enclosed warranty
card within 14 days from the date of purchase.
All rights are reserved. Reproduction in whole or in part is
prohibited without the written consent of the copyright owner,
Hanna Instruments Inc., 584 Park East Drive, Woonsocket,
Rhode Island, 02895 , USA.
Hanna Instruments reserves the right to modify the design,
construction and appearance of its products without advance
notice.
25
OTHER PRODUCTS FROM HANNAOTHER PRODUCTS FROM HANNA
OTHER PRODUCTS FROM HANNA
OTHER PRODUCTS FROM HANNAOTHER PRODUCTS FROM HANNA
• CABLES AND CONNECTORS
• CALIBRATION AND MAINTENANCE SOLUTIONS
• CHEMICAL TEST KITS
• CHLORINE METERS
• CONDUCTIVITY/TDS METERS
• DISSOLVED OXYGEN METERS
• HYGROMETERS
• ION SPECIFIC METERS (Colorimeters)
• MAGNETIC STIRRERS
• Na/NaCl METERS
• pH/ORP/Na ELECTRODES
• pH METERS
• PROBES (DO, µS/cm, RH, T, TDS)
• PUMPS
• REAGENTS
• SOFTWARE
• THERMOMETERS
• TITRATORS
• TRANSMITTERS
• TURBIDITY METERS
• Wide Range of ACCESSORIES
Most Hanna meters are available in the following formats:
• BENCH-TOP METERS
• POCKET-SIZED METERS
• PORTABLE METERS
• PRINTING/LOGGING METERS
• PROCESS METERS (Panel and Wall-mounted)
• WATERPROOF METERS
• METERS FOR FOOD INDUSTRY
For additional information, contact your dealer or the nearest Hanna
Customer Service Center.
You can also e-mail us at tech@hannainst.com.
26
CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY
CE DECLARATION OF CONFORMITY
CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY
DECLARATION OF CONFORMITY
We
Hanna Instruments Srl
V.le delle industrie 12
35010 Ronchi di Villafranca (PD)
ITALY
herewith certify that the wall-mounted instrument:
HI 9912
has been tested and found to be in compliance with the following regulations:
IEC 801-2
IEC 801-3
IEC 801-4
EN 55022
EN 61010-1
Electrostatic Discharge
RF Radiated
Fast Transient
Radiated, Class B
User Safety Requirement
Date of Issue: 07-06-1999
D.Volpato - Engineering Manager
On behalf of
Hanna Instruments S.r.l.
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the environment in
which it is used.
Operation of this instrument in residential areas could cause unacceptable interference
to radio and TV equipment.
Any variation introduced by the user to the supplied equipment may degrade the
instruments' EMC performance.
Unplug the instrument from power supply before replacing the fuse or making any
electrical connections.
27
HANNA LITERATUREHANNA LITERATURE
HANNA LITERATURE
HANNA LITERATUREHANNA LITERATURE
Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications.
The reference literature currently covers areas such as:
• Water Treatment
• Process
• Swimming Pools
• Agriculture
• Food
• Laboratory
• Thermometry
and many others. New reference material is constantly
being added to the library.
For these and other catalogs, handbooks and leaflets,
contact your dealer or the Hanna Customer Service
Center nearest to you. To find the Hanna Office in
your vicinity, check our home page at
www.hannainst.com.
http://www.hannainst.com
06/01
MAN9912R1
Loading...