Hanna Instruments HI 120 User Manual

Instruction Manual

ON

OFF

Calibration Check

LOG

CLR

CFM

CAL

pH / mV Meter

HI 122

HI 120 & HI 122

pH/mV/Temperature

Bench Meters

with Calibration Check

www.hannainst.com

1

Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instruments.
This manual will provide you with the necessary information for correct use

of the instruments, as well as a precise idea of their versatility.
If you need additional technical information, do not hesitate to e-mail us at

[e-mail] or turn to the back cover for our worldwide contact list.
These instruments are in compliance with directives.

WARRANTY

HI 120 and HI 122 are guaranteed for two years against defects in
workmanship and materials when used for their intended purpose and
maintained according to instructions. Electrodes and probes are guaranteed
for six months. This warranty is limited to repair or replacement free of
charge.

Damage due to accidents, misuse, tampering or lack of prescribed
maintenance is not covered.

If service is required, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number, date of purchase,
serial number and the nature of the problem. If the repair is not covered by
the warranty, you will be notified of the charges incurred. If the instrument
is to be returned to Hanna Instruments, first obtain a Returned Goods
Authorization number from the Technical Service department and then send
it with shipping costs prepaid. When shipping any instrument, make sure it
is properly packed for complete protection.

TABLE OF CONTENTS

WARRANTY ..................................................................................................... 2

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

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

FUNCTIONAL DESCRIPTION HI 120 .................................................................... 4

FUNCTIONAL DESCRIPTION HI 122 .................................................................... 5

HI 120 AND HI 122 SPECIFICATIONS ........................................................... 10

OPERATIONAL GUIDE ...................................................................................... 11

pH CALIBRATION ............................................................................................ 15

ENHANCED CALIBRATION MESSAGES ................................................................ 20

ELECTRODE CONDITION & ELECTRODE RESPONSE TIME ...................................... 21

RELATIVE mV CALIBRATION ............................................................................ 22

GOOD LABORATORY PRACTICE (GLP) ................................................................ 23

SETUP .......................................................................................................... 27

LOGGING ...................................................................................................... 31

AutoHOLD ..................................................................................................... 35

PRINTING (HI 122 only) ................................................................................ 36

TEMPERATURE CALIBRATION (for technical personnel only) .................................. 40

mV CALIBRATION (for technical personnel only) .................................................. 41

PC INTERFACE ............................................................................................... 42

pH BUFFER TEMPERATURE DEPENDENCE ......................................................... 44

ELECTRODE CONDITIONING & MAINTENANCE ..................................................... 45

PRINTER MAINTENANCE (HI 122 only) ............................................................ 48

TROUBLESHOOTING GUIDE ............................................................................. 49

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ..................................... 51

ACCESSORIES ................................................................................................ 52

2

PRELIMINARY 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 damage, notify your Dealer or the nearest Hanna Service Center.

Each instrument is supplied with:

• HI 1131P Glass-body Combination pH Electrode

• HI 7662-T Temperature probe

• pH 4.01 & 7.01 Buffer solutions, 20 mL each

• HI 7071S Electrolyte solution

• 5 paper rolls (HI 122 only)

• 12VDC Power Adapter

• Instruction Manual

Note: Save all packing material until you are sure that the instrument

functions correctly. All defective items must be returned in the
original packing with the supplied accessories.

GENERAL DESCRIPTION

The Hanna HI 120 and HI 122 are professional bench meters for pH, ORP
(Oxidation Reduction Potential) and Temperature measurements with
Calibration Check. Relative mV feature is also provided.

Calibration Check performs a set of diagnostic tests during calibration using
the history of electrode slope and offset to detect problems that can cause
loss of accuracy.

Calibration Check Features are:

• Enhanced Calibration Messages

• Electrode Condition on LCD Display

• Electrode Response Time on LCD Display

• Calibration Alarm Time-Out

• Out of Calibration Range

Other features include:

• Up to five-point calibration with seven memorized buffers (1.68, 4.01,

6.86, 7.01, 9.18, 10.01 and 12.45 pH) and two custom buffers.

• pH calibration using pH buffers with 0.001 resolution.

• pH reading with manual or automatic temperature compensation.

• Up to 50 samples for Log on demand mode and up to 1000 samples
for AutoLOG mode.

• Two selectable alarm limits.

• User selectable AutoLOG modes.

• Printing feature in four selectable languages (HI 122 only).

• Large easy-to-read LCD which shows the pH or mV and Temperature
simultaneously, together with graphic symbols.

• AutoHOLD feature to freeze first stable reading on the LCD.

• GLP feature to view last calibration data for pH and Relative mV.

• PC interface.

3

FUNCTIONAL DESCRIPTION

NUMReso

RelmVmVpH

AutoLOG

SETGLPAutoHOLD

ON OFF

Front Panel

Rear Panel

1

2

3

4

Primary LCD

Secondary LCD

Electrode Condition

5

6

7

8

9

Electrode Response

RS232POWERTEMPpH/ORPPIN

Calibration Check

RCL

LOG

MODE

CLR

CFMCAL

pH / mV Meter

HI 120

HI 120

1) Left Keyboard

2) ON switch

3) OFF switch

4) Right Keyboard

5) Pin input socket

6) BNC electrode connector

7) Temperature probe socket

8) Power adapter socket

9) RS232 serial communication connector

4

FUNCTIONAL DESCRIPTION

ON OFF

NUMReso

RelmVmVpH

AutoLOG

PaperPrintAutoHOLD

1

2

3

4

Front Panel

Primary LCD

Secondary LCD

Electrode Condition

Electrode Response

Rear Panel

567

8

9

10

Paper Roll

RS232POWERTEMPpH/ORPPIN

Calibration Check

LOG

CLR

CFMCAL

pH / mV Meter

HI 122

HI 122

1) Left Keyboard

2) ON switch

3) OFF switch

4) Right Keyboard

5) Pin input socket

6) BNC electrode connector

7) Temperature probe socket

8) Power adapter socket

9) RS232 serial communication connector

10) Printer

5

HI 120

1 2

3

4

5

10 11 12

7

6

9

8

NUMResolution

RelmVmVpH

AutoLOG

SETGLPAutoHOLD

KEYBOARD ON THE LEFT

Shortcuts to alternate functions

1) AutoHOLD key, to freeze the first stable reading on the LCD.

2) GLP key, to display Good Laboratory Practice Information.

3) SET key, to enter/exit SETUP mode.

4) key, to toggle between parameters while in RECALL or SETUP

modifying mode (backwards), to toggle between absolute mV and
temperature while in Relative mV mode and between pH buffer and
temperature while in pH calibration mode.

5) AutoLOG key, to start/stop AutoLOG mode.

6) key, to toggle between parameters while in RECALL or SETUP

modifying mode (forwards), to toggle between absolute mV and
temperature while in Relative mV mode and between pH buffer and
temperature while in pH calibration mode.

7) pH key, to select pH range.

8) mV key, to select mV range.

9) RelmV key, to select Relative mV range.

11) Resolution key, to select pH resolution.

Numerical keys

10) key, to change sign.

12) NUM key, to activate the numerical keys (0 to 9).

6

HI 120

1

9

8

7

6

5

4

3

2

Calibration Check

RCL

LOG

MODE

CLR

CFMCAL

pH / mV Meter

HI 120

MAIN KEYBOARD ON THE RIGHT

1) CAL key, to enter and exit/escape calibration mode.

SET key (second function), to enter/exit SETUP mode.

2) CFM key, to confirm different values.

GLP key (second function), to display Good Laboratory Practice Information.

3) CLR key, to clear calibration or logged data.

4) key, to manually increase temperature value or other parameters.

AutoHOLD key (second function), to freeze the first stable reading on
the LCD.

5) key, to manually decrease temperature value or other parameters.

AutoLOG key (second function), to start/stop AutoLOG mode.

6) MODE key, to select the measurement unit or to switch focused data.

7) 2nd key, to select second key function.

8) LOG key, to store measured data.

9) RCL key, to enter/exit view logged data mode.

Note: To select second key function, press 2nd and then the desired key.

The “2nd” tag will appear on the LCD until the desired key is
pressed. To leave second key function selection, press 2nd again.

7

HI 122

1 2

3

4

5

10 11 12

7

6

9

8

NUMResolution

RelmVmVpH

AutoLOG

PaperPrintAutoHOLD

KEYBOARD ON THE LEFT

Shortcuts to alternate functions

1) AutoHOLD key, to freeze the first stable reading on the LCD.

2) Print key, to obtain a printout or to cancel printing.

3) Paper key, to pull out the paper.

4) key, to toggle between parameters while in RECALL or SETUP

modifying mode (backwards), to toggle between absolute mV and
temperature while in Relative mV mode and between pH buffer and
temperature while in pH calibration mode.

5) AutoLOG key, to start/stop AutoLOG mode.

6)

key, to toggle between parameters while in RECALL or SETUP
modifying mode (forwards), to toggle between absolute mV and
temperature while in Relative mV mode and between pH buffer and
temperature while in pH calibration mode.

7) pH key, to select pH range.

8) mV key, to select mV range.

9) RelmV key, to select Relative mV range.

11) Resolution key, to select pH resolution.

Numerical keys

10) key, to change sign.

12) NUM key, to activate the numerical keys (0 to 9).

8

HI 122

9

8

7

6

5

4

3

2

1

Calibration Check

LOG

CLR

CFMCAL

pH / mV Meter

HI 122

MAIN KEYBOARD ON THE RIGHT

1) CAL key, to enter and exit/escape calibration mode.
SET key (second function), to enter/exit SETUP mode.

2) CFM key, to confirm different values.
GLP key (second function), to display Good Laboratory Practice Information.

3) CLR key, to clear calibration or logged data.

4) key, to manually increase temperature value or other parameters.
AutoHOLD key (second function), to freeze the first stable reading on

the LCD.

5) key, to manually decrease temperature value or other parameters.
AutoLOG key (second function), to start/stop AutoLOG mode.

6) MODE key, to select the measurement unit or to switch focused data.
Paper key (second function), to pull out the paper.

7) 2nd key, to select second key function.

8) LOG key, to store measured data.

9) RCL key, to enter/exit view logged data mode.

Print key (second function), to obtain a printout or to cancel printing.

Note: To select second key function, press 2nd and then the desired key.

The “2nd” tag will appear on the LCD until the desired key is
pressed. To leave second key function selection, press 2nd again.

9

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HI 120 AND HI 122

SPECIFICATIONS

10

OPERATIONAL GUIDE

POWER CONNECTION

Plug the 12 VDC adapter into the power supply socket.
Notes: • These instruments use non volatile memory to retain the pH,

mV, temperature calibrations and all other settings, even
when unplugged.

• Make sure a fuse protects the main line.

ELECTRODE AND PROBE CONNECTIONS

For HANNA P type pH or ORP electrodes (with internal reference) connect the
electrode’s BNC to the socket on the back of the instrument (#6 on page 4
and 5) and the pin to the appropiate socket (#5 on page 4 and 5).

Notes: • Electrode condition and response information is displayed on the

bar graph gauges during the day the calibration is performed
only if HANNA P type (PIN) electrodes are used.

• If the electrode is not recognized as a HANNA P type electrode,
the bar graph gauges will blink (25 seconds OFF, 4 seconds ON,
full bar graph).

For temperature measurements and automatic temperature compensation,
connect the temperature probe to the appropriate socket.

INSTRUMENT START-UP

• Turn the instrument on by pressing the ON switch.

• All LCD tags are displayed and a beep is heard while the instrument
performs a self test.

• The instrument displays then the date on the primary LCD and the
time on the secondary LCD, along with the “Remove protective cap”
and “Unscrew electrode refilling cap” messages alternatively blinking.
These messages alert the user to follow displayed instructions in order
to take proper measurements and to improve electrode response.

• The instrument automatically defaults to pH or mV measurement
mode, if a HANNA P type pH or ORP electrode is detected.

• If no HANNA P type electrode is detected, the instrument starts in the
same range as it was at power off.

11

pH MEASUREMENTS

Make sure the instrument has been calibrated before
taking pH measurements.

• Press MODE to enter pH mode.

Note: To change pH resolution, press MODE again or

simply Resolution from the left keyboard.

• Submerge the electrode tip and the temperature
probe approximately 4 cm (1½”) into the sample to
be tested. Allow time for the electrode to stabilize.

• The pH is displayed on the primary LCD and the
temperature on the secondary LCD.

OUT CAL RANGE feature warns the user if the current reading is out of the
calibrated area. The calibrated area is that part of the pH range in which
the calibration point assures an accurate reading. If the reading is taken out
of the calibration area, the “OUT CAL RANGE” message will blink. The
calibrated area is calculated in according with the pH resolution used during
the reading. To avoid having this message, the calibration points have to be
well distributed in the desired measurement range.

If measurements are taken successively in different samples, it is recommended
to rinse the electrode thoroughly with deionized water or tap water and then
with some of the next sample to prevent cross-contamination and to condition
the electrode before immersing it into the sample solution.

The pH reading is affected by temperature. In order to measure the pH
accurately, the temperature effect must be compensated for. To use the
Automatic Temperature Compensation feature, connect and submerge
the HI 7662-T temperature probe into the sample as close as possible to the
electrode and wait for a few seconds.

If the temperature of the sample is known, manual temperature
compensation can be performed by disconnecting the temperature probe.

The display will then show the default temperature of 25 ºC (77 ºF) or the
last temperature reading with the “ºC” (or “ºF”) tag blinking. The
temperature can be adjusted with the ARROW keys or the numerical
keypad (from –20.0 ºC to 120.0 ºC or from –4.0 ºF to 248.0 ºF).

12

Press NUM to change the temperature value with the numerical keys. The
“2nd” tag will blink. Press CLR if you want to delete digits of the
displayed value. The remaining digits will shift to right. Introduce the
desired value. If the value is out of temperature range, a long beep will
be heard. Press NUM to confirm the new value or CAL to escape without
changing the temperature.

mV/ORP MEASUREMENTS

Oxidation-reduction potential (REDOX) measurements provide the quantification
of the oxidizing or reducing power of the tested sample.

To correctly perform a redox measurement, the surface of the ORP electrode
must be clean and smooth.

• Press MODE or simply mV from the left keyboard to
enter mV range.

• Submerge the tip of the ORP electrode (4 cm/1½”)
into the sample to be tested and allow a few
seconds for the reading to stabilize.

• The instruments display the mV reading on the primary LCD and the
temperature on the secondary LCD.

• If the reading is out of range, the closest full-scale value will be
displayed blinking on the primary LCD.

RELATIVE mV MEASUREMENTS

To enter Relative mV mode, press MODE or simply RelmV from the left
keyboard. The relative mV reading will be displayed on the primary LCD and
the current temperature value on the secondary LCD.

Note: Press or from the left keypad to toggle between temperature

and absolute mV reading on the secondary LCD.

13

The Relative mV reading is equal to the difference between the absolute
mV input value and relative mV offset established in the relative mV
calibration.

TEMPERATURE MEASUREMENTS

Connect the HI 7662-T temperature probe to the appropri-
ate socket. Immerse the temperature probe into the sample
and allow the reading on the secondary LCD to stabilize.

Note: The temperature can be displayed in Celsius degrees (ºC) or in

Fahrenheit degrees (ºF) (see SETUP for details, page 27).

14

pH CALIBRATION

Calibrate the instrument often, especially if high accuracy is required.
The instrument should be recalibrated:

• Whenever the pH electrode is replaced.

• At least once a week.

• After testing aggressive chemicals.

• If “CAL DUE” tags are blinking during measurement.

• If “OUT CAL RANGE” message blinks during pH measurement (the
measurement range is not covered by current calibration).

PREPARATION

Pour small quantities of the buffer solutions into clean beakers. If possible,
use plastic or glass beakers to minimize any EMC interferences.

For accurate calibration and to minimize cross-contamination, use two beakers
for each buffer solution. One for rinsing the electrode and one for calibration.

If you are measuring in the acidic range, use pH 7.01 or 6.86 as first buffer
and pH 4.01 or 1.68 as second buffer. If you are measuring in the alkaline range,
use pH 7.01 or 6.86 as first buffer and pH 10.01/9.18 or 12.45 as second buffer.

For extended range measurements (acidic and alkaline), perform a five-point
calibration by selecting five of the available buffers.

PROCEDURE

If 0.001 pH resolution is selected, each selected standard buffer value can
be updated in according with the value on the production lot certificate at
25 ºC (77 ºF). Press 2nd then SET key when a standard pH buffer with

0.001 resolution is selected. The buffer value will start blinking and it can

be changed with the ARROW keys in a ±0.020 pH window.
Calibration has a choice of 7 memorized buffers: pH 1.68, 4.01, 6.86,

7.01, 9.18, 10.01, 12.45 and 2 custom buffers.

The custom buffers are a special option that allows the user to calibrate in
a buffer solution different from a standard one. Up to two custom buffers
can be set in SETUP menu (see page 27). When selected during
calibration, the “CUSTOM C1” or “CUSTOM C2” tags are displayed on the
LCD and the custom buffer value can be changed in a ±1.0 pH window,
around the set value.

For accurate measurements it is recommended to perform a five-point
calibration. However, at least a two-point calibration is suggested.

The instruments will automatically skip the buffers used during calibration
and the buffers which are in a ±0.2 pH window, around one of the
calibrated buffers.

15

All new calibrations will override existing stored calibration data, in a ±0.2

CAL

pH window, at these calibration points. The slopes adjacent to the calibration
points will be reevaluated.

If the new calibration point has no correspondence in the existing stored
calibration data, it is added to it if this is not full, or the instrument will
ask which buffer will be replaced by the current buffer.

If at least a two-point calibration has been performed and an offset
correction of the electrode is desired, keeping unchanged the existing
slopes, perform a one-point calibration with “OFFS” option selected in
SETUP menu. If “Pnt” option is selected, the slopes adjacent to the
calibration points will be reevaluated.

FIVE-POINT CALIBRATION

• Immerse the pH electrode and the temperature
probe approximately 4 cm (1½”) into a buffer
solution of your choice (pH 1.68, 4.01, 6.86, 7.01,

9.18, 10.01, 12.45, custom buffer 1 or 2, if these
were set) and stir gently. The temperature probe
should be close to the pH electrode.

• Press CAL. The “CLEAR CAL IF NEW ELECTRODE”
message will be displayed blinking on the LCD for a
few seconds if the instrument was calibrated before
and calibration was not cleared.

Press CLR if you are using a new electrode or want to clear calibration
history, or wait a few seconds to continue.

Press CAL again or the ARROW keys to skip this message.
Note: It is very important to clear calibration history when a new

electrode is used because most errors and warning messages
that appear during calibration depend on calibration history.

• The instruments will display the measured pH on the primary LCD and
the “7.01” buffer on the secondary LCD, together with “CAL” and “Cal
Point 1” tags and “7.01” tag blinking.

• If necessary, press the ARROW keys to select a different buffer value.

16

• The “ ” tag will blink on the LCD until the reading is stable.

CFM

CFM

CFM

• When the reading is stable and close to the selected
buffer, “CFM” tag blinks.

• Press CFM to confirm calibration.

• The calibrated value is then displayed on the primary
LCD and the secondary LCD will display the second
expected buffer value, together with “CAL”, “Cal
Point 2” and “7.01” tags and the corresponding
buffer tag blinking.

• After the first calibration point is confirmed, immerse the pH electrode and
the temperature probe approximately 4 cm (1½”) into the second buffer
solution and stir gently. The temperature probe should be close to the pH
electrode.

• If necessary, press the ARROW keys to select a different buffer value.

• The “ ” tag will blink on the LCD until the reading is stable.

• When the reading is stable and close to the selected
buffer, “CFM” tag blinks.

• Press CFM to confirm calibration.

• The calibrated value is then displayed on the
primary LCD and the secondary LCD will display the
third expected buffer value.

• After the second calibration point is confirmed, immerse the pH
electrode and the temperature probe approximately 4 cm (1½”) into
the third buffer solution and stir gently. The temperature probe should
be close to the pH electrode.

• If necessary, press the ARROW keys to select a different buffer value.

• The “ ” tag will blink on the LCD until the reading is stable.

• When the reading is stable and close to the selected
buffer, “CFM” tag blinks.

• Press CFM to confirm calibration.

• The calibrated value is then displayed on the
primary LCD and the secondary LCD will display the
fourth expected buffer value.

17