Hanna Instruments HI 9910 User manual

Instruction Manual
HI9910 • HI9911
HI9920
Wall Mounted
pH & ORP
Controllers
www.hannainst.com

2
PRELIMINARY EXAMINATION .........................................................3
GENERAL DESCRIPTION.................................................................3
MECHANICAL LAYOUTS..................................................................4
HI9910 FUNCTIONAL DESCRIPTION & SPECIFICATIONS...................6
HI9911 FUNCTIONAL DESCRIPTION & SPECIFICATIONS...................8
HI9920 FUNCTIONAL DESCRIPTION & SPECIFICATIONS.................10
CONNECTIONS & WIRING............................................................12
pH CALIBRATION .......................................................................16
ORP CALIBRATION .....................................................................18
SETPOINT ADJUSTMENT..............................................................19
TAKING MEASUREMENT ..............................................................22
PROPORTIONAL CONTROL............................................................23
OVERDOSAGE TIMER...................................................................25
pH VALUES AT VARIOUS TEMPERATURES.....................................25
REDOX MEASUREMENT (HI9920 only).........................................26
SUGGESTED INSTALLATIONS FOR pH/ORP ELECTRODES.................28
ACCESSORIES.............................................................................29
TABLE OF CONTENTS
Dear Customer,
Thank you for choosing a Hanna Instruments®product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct
operations. If you need more technical information, do not hesitate to
e-mail us at [email protected].
These instruments are in compliance with the directives.
WARRANTY
All Hanna Instruments Office controllers are warranted for two years
against defects in workmanship and materials when used for their intended
purpose and maintained according to instructions. Electrodes and probes are
warranted for six months.
Damages due to accidents, 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 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 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.

3
PRELIMINARY EXAMINATION
GENERAL DESCRIPTION
Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during ship-
ping. If there is any noticeable damage, please contact your local
Hanna Instruments Office.
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.
Warning:
• 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.
• The main power line of the instruments is protected by a 400 mA
fuse, while the dosage and alarm terminals are protected by separate
2 A fuses. Use only the specified fuses for replacement.
HI9910, HI9911 and HI9920 are wall-mounted pH and ORP regulators
designed to meet a variety of process control requirements.
The electrode can be installed by simply plugging it to the universal
BNC socket on the bottom of the meter.
These instruments also incorporate a triple contact alarm system for
triggering an external control, as a buzzer, light or any other electrical
device.
To avoid any interference, the recorder output terminals are isolated
from the controller circuitry, and 0-20 or 4-20 mA output can be
select by the user.
The housing is built for last with a rugged, modular, fiber-reinforced
ABS material.
Choose the controller which better meets your needs among HI9910
(single setpoint pH regulator), HI9911 (dual setpoint pH regulator) or
HI9920 (single setpoint ORP regulator).
Each model is available in three versions, according to different power
supply requirement: 115 Vac, 230 Vac or 100 Vac.

4
MECHANICAL LAYOUTS
Fig.3
Figure 3: Dimensioned bottom view.
Figure 2: Controls and terminals of the HI9910 pH controller.
Layouts vary according to model.
Fig.2
Fig.1
Figure 1: BNC plug for electrode and wiring access ports.

5
Fig.4
Figure 4: Dimensioned front view. The molded, mounting holes in
the four corners provide for quick and secure installation.
No additional hardware is needed for mounting. All electri-
cal connections and controls are located on the front of the
instrument, so that any adjustment can be made without
needing to remove the unit.

6
HI9910 FUNCTIONAL DESCRIPTION
1. Liquid Crystal Display
2. Slope calibration trimmer
3. Setpoint trimmer for Fine adjustment
4. Setpoint trimmer for Coarse adjustment
5. Offset calibration trimmer
6. Dosing LED
7. READ/SET switch for selecting normal measurement or setpoint
adjustment mode
8. Acid/Alkaline Dosage selection switch
9. Alarm LED and switch to disable the alarm
10. Manual Temperature Compensation knob
11. Overdosage timer knob
12. Proportional pH band and time cycle settings knobs
13. pH ∆Alarm setting trimmer (from 0.5 to 2.5 pH)
14. Short these terminals if no ground probe is used, or wire the
ground probe to the Matching Pin terminal
15. Pt100 probe terminals
16. Recorder output contacts
17. Automatic or Manual Temperature Compensation selection switch
18. 0-20 mA or 4-20 mA isolated output selection switch
19. Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position (2 A fuse protected)
20. Powered dosage terminals (Relay, 2 A fuse protected)
21. Power supply terminals (400 mA fuse protected)

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HI9910 SPECIFICATIONS
Unplug the instrument from the power supply before
wiring or replacing the fuses.
RANGE 0.00 to 14.00 pH
RESOLUTION 0.01 pH
ACCURACY
(@25 °C/77 °F) ±0.02 pH
TYPICAL EMC DEV. ±0.1 pH
mA OUTPUT User-selectable, 0-20 mA or 4-20 mA
over the 0-14 pH range with isolated output
CALIBRATION Through “OFFSET” and “SLOPE” trimmers
(Max. ±1.5 pH for offset and 80 to 110% for slope)
TEMPERATURE
COMPENSATION
Manual from -10 to 80 °C (14 to 176 °F) or
Automatic with a 3-wire Pt100 probe from 0 to 50 °C
(32 to 122 °F)
SETPOINT RANGE From 0.00 to 14.00 pH with 2 trimmers: “COARSE”
for approx. regulation, “FINE” for fine tuning
PROPORTIONAL
CONTROL
pH is user adjustable from 0 to 2.0 and
time cycle from 0 to 90 seconds
ALARM CONTACT
Terminals can be configured as Normally Open or Nor-
mally Closed (isolated output Max. 2A/250Vac/30Vdc,
resistive load, 1.000.000 strokes). The alarm is activated
if pH varies by more than user-selectable interval (0.5 to
2.5 pH) from setpoint or due to overdosage
DOSING TERMINALS
Relay terminals (Max. 2A/250Vac/30Vdc, resistive load,
1.000.000 strokes) are activated whenever pH exceeds
the “ACID” setpoint (Acid dosage) or falls below the
“ALK” setpoint (Alkaline dosage)
ENVIRONMENT -10 to 50 °C (14 to 122 °F);
RH 95% non-condensing
CASE MATERIAL Fiber-reinforced, flame-retardant ABS
POWER SUPPLY
HI9910-1 : 115 Vac, 60 Hz
HI9910-2 : 230 Vac, 50 Hz
HI9910-3 : 100 Vac, 50/60 Hz
ENCLOSURE 181 x 221 x 142 mm (7.1 x 8.7 x 5.6”)
WEIGHT 1.6 kg (3.5 lb.)

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HI9911 FUNCTIONAL DESCRIPTION
1. Liquid Crystal Display
2. Slope calibration trimmer
3. Setpoint trimmers for acid and alkaline feed, Fine tuning
4. Setpoint trimmers for acid and alkaline feed, Coarse adjustment
5. Offset calibration trimmer
6. Dosing LED’s for acid and alkaline feed
7. READ/SET switch for selecting normal measurement or setpoint
adjustment mode
8. Acid/Alkaline setpoint selection switch
9. Alarm LED and switch to disable the alarm
10. Manual Temperature Compensation knob
11. Two independent overdosage timers knobs
12. Proportional pH band and time cycle settings knobs
13. pH ∆Alarm setting trimmer (from 0.5 to 2.5 pH)
14. Short these terminals if no ground probe is used, or wire the
ground probe to the Matching Pin terminal
15. Pt100 probe terminals
16. Recorder output contacts
17. Automatic or Manual Temperature Compensation selection switch
18. 0-20 mA or 4-20 mA isolated output selection switch
19. Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position (2 A fuse protected)
20. Powered dosage terminals (Relay, 2 A fuse protected)
21. Power supply terminals (400 mA fuse protected)

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HI9911 SPECIFICATIONS
Unplug the instrument from the power supply before
wiring or replacing the fuses.
RANGE 0.00 to 14.00 pH
RESOLUTION 0.01 pH
ACCURACY
(@25 °C/77 °F) ±0.02 pH
TYPICAL EMC DEV. ±0.1 pH
mA OUTPUT User-selectable, 0-20 mA or 4-20 mA
over the 0-14 pH range with isolated output
CALIBRATION Through “OFFSET” and “SLOPE” trimmers
(Max. ±1.5 pH for offset and 80 to 110% for slope)
TEMPERATURE
COMPENSATION
Manual from -10 to 80 °C (14 to 176 °F) or
Automatic with a 3-wire Pt100 probe from 0 to 50 °C
(32 to 122 °F)
SETPOINT RANGE From 0.00 to 14.00 pH with 2 trimmers: “COARSE”
for approx. regulation, “FINE” for fine tuning
PROPORTIONAL
CONTROL
pH is user adjustable from 0 to 2.0 and
time cycle from 0 to 90 seconds
ALARM CONTACT
Terminals can be configured as Normally Open or Nor-
mally Closed (isolated output Max. 2A/250Vac/30Vdc,
resistive load, 1.000.000 strokes). The alarm is activated
if pH varies by more than user-selectable interval (0.5 to
2.5 pH) from setpoint or due to overdosage
DOSING TERMINALS
Two sets of independent relay terminals (Max.
2A/250Vac/30Vdc, resistive load, 1.000.000 strokes)
are activated whenever pH exceeds the “ACID” setpoint
(Acid dosage) or falls below the “ALK” setpoint (Alkaline
dosage)
ENVIRONMENT -10 to 50 °C (14 to 122 °F);
RH 95% non-condensing
CASE MATERIAL Fiber-reinforced, flame-retardant ABS
POWER SUPPLY
HI9911-1 : 115 Vac, 60 Hz
HI9911-2 : 230 Vac, 50 Hz
HI9911-3 : 100 Vac, 50/60 Hz
ENCLOSURE 181 x 221 x 142 mm (7.1 x 8.7 x 5.6”)
WEIGHT 1.6 kg (3.5 lb.)

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HI9920 FUNCTIONAL DESCRIPTION
1. Liquid Crystal Display
2. Setpoint trimmer for Fine adjustment
3. Setpoint trimmer for Coarse adjustment
4. Calibration trimmer
5. Dosing LED
6. READ/SET switch for selecting normal measurement or setpoint
adjustment mode
7. Oxidization/Reduction Dosage selection switch
8. Alarm LED and switch to disable the alarm
9. Overdosage timer knob
10. Proportional ORP band and time cycle settings knobs
11. ORP ∆Alarm setting trimmer (from 50 to 250 mV)
12. Short these terminals if no ground probe is used, or wire the
ground probe to the Matching Pin terminal
13. Recorder output contacts
14. 0-20 mA or 4-20 mA isolated output selection switch
15. Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position (2 A fuse protected)
16. Powered dosage terminals (Relay, 2 A fuse protected)
17. Power supply terminals (400 mA fuse protected)

11
HI9920 SPECIFICATIONS
Unplug the instrument from the power supply before
wiring or replacing the fuses.
RANGE -500 to 1500 mV
RESOLUTION 1 mV
ACCURACY
(@25 °C/77 °F) ±5 mV
TYPICAL EMC DEV. ±6 mV
mA OUTPUT User-selectable, 0-20 mA or 4-20 mA
over the -500 to 1500 mV range with isolated output
CALIBRATION Through “CAL” trimmer
SETPOINT RANGE From -500 to 1500 mV with 2 trimmers:
“COARSE” for approx. regulation, “FINE” for fine tuning
PROPORTIONAL
CONTROL
ORP setting is user adjustable from 0 to 200 mV
and time cycle from 0 to 90 seconds
ALARM CONTACT
Terminals can be configured as Normally Open or Nor-
mally Closed (isolated output Max. 2A/250Vac/30Vdc,
resistive load, 1.000.000 strokes). The alarm is activated
if the ORP value varies by more than user-selectable inter-
val (50 to 250 mV) from setpoint, or due to overdosage
DOSING TERMINALS
Relay terminals (Max. 2A/250Vac/30Vdc, resistive load,
1.000.000 strokes) are activated when mV exceeds
the setpoint (“RED” dosage) or falls below the setpoint
(“OXID” selection)
ENVIRONMENT -10 to 50 °C (14 to 122 °F);
RH 95% non-condensing
CASE MATERIAL Fiber-reinforced, flame-retardant ABS
POWER SUPPLY
HI9920-1 : 115 Vac, 60 Hz
HI9920-2 : 230 Vac, 50 Hz
HI9920-3 : 100 Vac, 50/60 Hz
ENCLOSURE 181 x 221 x 142 mm (7.1 x 8.7 x 5.6”)
WEIGHT 1.6 kg (3.5 lb.)

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CONNECTIONS & WIRING
• 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.
• Wire the controller completely, connect all the external devices
(pumps, alarm, electrode, etc.), set the alarm threshold and adjust
the settings.
• Replace the cover, then connect the controller to the mains.
ELECTRODE CONNECTION
• Simply plug any combination pH or ORP electrode (such as
HI1002/3 or HI2002/3) to the BNC socket on the bottom of the
casing and twist it into a secure position.
• All models are provided with the differential input
feature to reduce electrical noise and interference,
and come with the Matching Pin and Reference
terminals shorted.
If using no matching pin (ground probe), leave the terminals
shorted.
• If using a probe for grounding
purposes, wire it to the Matching
Pin terminal on the right hand
panel and remove the jumper.
RELAY CONNECTIONS
• Wire the external device(s), as pump or electrovalve, directly to
the relay terminal strip (one for HI9910 and HI9920, and two
for HI9911) of the controller. The terminals are powered and no
external power supply for pump or electrovalve is needed.

13
ALARM CONNECTIONS
• The alarm threshold is user-selectable from
0.5 to 2.5 pH for HI9910 and HI9911, or
from 50 to 250 mV for HI9920, by turning
the alarm trimmer with a small screwdriver.
If the actual measurement is above or below the setpoint by a
value greater than the selected threshold, the alarm terminal is
activated. The alarm can be configured as Normally Closed (“NC”)
by connecting the external device to the COM and NC terminals or
Normally Open (“NO”) by connecting the external device to the
COM and NO terminals.
• When the alarm is activated, the alarm LED turns on and the alarm
contacts will open or close, triggering the external connected device.
When the alarm is activated all the other terminals (such as dosing
relays) are disactivated.
• The alarm ON/OFF switch can only disable the
alarm terminal (e.g. the buzzer stops sound),
while all the other functions, such as disactiva-
tion of the dosing relays, are not affected.
• The controllers provide for automatic fail-safe security 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 the maximum
dosage time is exceeded. The overdosage timer
can be set from 1 to 10 minutes.
For HI9911, two timers can be independently
selected for acid and alkaline corrections.
• Once an alarm condition occurs, the alarm contact remains activated
until the switch is manually put in the off position or the measure-
ment returns to normal values.

14
• The alarm is activated for readings varying as follow:
HI9910: 0.5 to 2.5 pH (user-selectable) above or below the setpoint;
HI9911: 0.5 to 2.5 pH (user-selectable) lower than the ALKALINE
setpoint or higher than the ACID setpoint;
HI9920: 50 to 250 mV (user-selectable) above or below the setpoint.
RECORDER OUTPUT CONNECTIONS
• The recorder output contacts are isolated from the controller circuitry
to avoid interference.
Before wiring, select the desired output
(0-20 or 4-20 mA) with the selector
switch.
The mA output value corresponds to the pH or ORP value over the
whole measurement range. For example, when measuring pH 7, the
output value is 10 or 12 mA depending from the selected output
interval (0-20 or 4-20 mA respectively).
TEMPERATURE COMPENSATION (HI9910 & HI9911 only)
• Manual Temperature Compensation: move the selector switch
to the MTC position, then manually set the temperature by turning
the MTC knob to the correct working temperature.
• Automatic Temperature Compensation: move the selector switch
to the ATC position, then wire a Pt100 probe, such as HI7610 to
the proper terminals as indicated.

15
HI7610 is a probe with stainless steel body and 5 m cable.
For solutions not compatible with stainless steel, use the HI7620 glass-
body probe, or another appropriate 3-wire Pt100 probe.
MAIN POWER SUPPLY CONNECTION
• For each model (HI9910, HI9911, HI9920) three versions are
available, according to different power supply requirement:
version -1 works at 115 Vac; 60 Hz
version -2 works at 230 Vac; 50 Hz
version -3 works at 100 Vac; 50/60 Hz
• Before connecting the unit to the mains, make sure that the
controller is completely wired and that all the external devices (as
pump, alarm, electrode, etc.) have been connected.
• Wire the external power supply to the three
terminals as indicated; reattach the cover
making sure the gasket is in place, and
tight the 4 screws.
• Only then connect the controller to the mains.

16
Properly connect the pH electrode and wire the separate ground probe
(if used) to the controller, then plug the meter to the mains.
It is recommended to perform calibration at a temperature similar to
that of the sample to be monitored.
Use a Checktemp (or another accurate thermom-
eter) as reference for temperature.
Remove the electrode protective cap.
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 used, make sure
that the Reference and the Matching Pin terminals
are shorted.
If the pH electrode incorporates a ground probe/matching pin
(as for example HI1003/3), remove the jumper.
Set the SET/READ switch to “READ” position.
OFFSET ADJUSTMENT:
• Rinse the electrode (and ground probe) with
pH7.01 solution (HI7007), then immerse the
tip(s) in pH7.01 buffer. An immersion level
of about 4 cm (1.5”) is recommended.
• Place the Checktemp thermometer in the buffer solution. Adjust
the knob to show the same temperature as that measured by the
Checktemp and make sure the selector switch is in the MTC position.
pH CALIBRATION (HI9910 and HI9911)

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• Wait for the reading to stabilize and
then adjust the “OFFSET” trimmer
to display the buffer pH value at the
measured temperature, e.g. pH7.01
if the temperature is 25 °C (77 °F).
• Refer to the table at page 25 for the appropriate buffer value at a
given temperature, and adjust the trimmer accordingly.
SLOPE ADJUSTMENT:
• Rinse the electrode (and ground probe)
thoroughly with water and immerse the
tip(s) in pH4.01 (HI7004) or pH10.01
(HI7010) buffer solution. An immersion
level of about 4 cm (1.5”) is recom-
mended.
Note: Use pH4.01 if monitoring acidic solutions; use pH10.01 for
alkaline samples.
• Stir the electrode and wait for the display to stabilize before
adjusting the “SLOPE” trimmer to display the buffer pH value
at the measured temperature, e.g. pH4.01 (or pH10.01) if the
temperature is 25 °C (77 °F).
• Refer to the table at page 25 for the appropriate buffer value at a
given temperature, and adjust the trimmer accordingly.
The pH calibration is now complete.

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ORP CALIBRATION (HI9920)
Properly connect the ORP electrode and wire the separate ground probe
(if used) to the controller, then plug the meter to the mains.
Remove the electrode protective cap.
Immerse the electrode and the ground probe (if
in use) in the reference solution. An immersion
level of about 4 cm (1.5”) is recommended.
If no separate ground probe is used, make
sure that the Reference and the Matching Pin
terminals are shorted.
If the ORP electrode incorporates a ground probe/matching pin
(as for example HI2003/3), remove the jumper.
Set the SET/READ switch to “READ” position.
Immerse the electrode in a solution of known
ORP (mV) value and wait for a few minutes for
the reading to stabilize.
Adjust the CAL trimmer to display the
known value, for example 230 mV.

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SETPOINT ADJUSTMENT
The electrode and the ground probe (if in use) have to be properly
installed and calibration performed.
FOR HI9910
Set the SET/READ switch to “SET” posi-
tion; the display shows the previously set
value (e.g. pH8.00).
Using a small screwdriver, first adjust the value through the COARSE
trimmer and then tune it through the FINE trimmer until the desired
setpoint value is displayed (e.g. pH6.00).
DOSING SELECTION
Select the desired dosing, acid or alkaline, through
the ALK/ACID switch.
To dose acidic substances/solutions and lower the
pH value, set the selector switch to “ACID”; to dose
bases or alkaline solutions and increase the pH value,
select “ALK”.
Dosing acidic solution, example
Setpoint = pH6.00
Measured value = pH7.00
To reach the setpoint value it is necessary to dose acid: move the switch
to “ACID” position.
Dosing alkaline solution, example
Setpoint = pH6.00
Measured value = pH4.00
To reach the setpoint value it is necessary to dose base: move the
switch to “ALK” position.

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FOR HI9911 (DUAL-POINT ADJUSTMENT)
a) ACID SETPOINT and DOSAGE
To set the upper limit and direct the controller to lower the pH value,
set the SET/READ switch to “SET” and the ALK/ACID switch to “ACID”;
the display shows the higher setpoint (e.g. pH7.00).
Using a small screwdriver, adjust the two “ACID SET” trimmers. First
adjust the “COARSE” trimmer and then tune through the “FINE” trimmer
until the desired setpoint value is displayed (e.g. pH8.00).
b) ALKALINE SETPOINT and DOSAGE
To set the lower limit and direct the controller to increase the pH value,
set the SET/READ switch to “SET” and the ALK/ACID switch to “ALK”;
the display shows the lower setpoint (e.g. pH6.00).
Using a small screwdriver, adjust the two “ALKALINE SET” trimmers.
First adjust the “COARSE” trimmer and then tune through the “FINE”
trimmer until the desired setpoint value is displayed (e.g. pH5.00).