Hanna Instruments HI772 Instruction Manual

Please examine this product carefully. Make sure that the instrument is not damaged. If
any damage occurred during shipment, please contact your local Hanna Instruments Office.
Each HI772 meter is supplied complete with:

• Sample Cuvettes and Caps (2 pcs.)

• Reagents for 25 tests

• 1 mL syringe with tip

• 1.5V AAA Battery (1 pc.)

• Instruction Manual and Quick Reference

Light High: There is too much light to perform a measurement. Please
check the preparation of the zero cuvette.

Light Low: There is not enough light to perform a measurement. Please
check the preparation of the zero cuvette.

Inverted Cuvettes: The sample and the zero cuvette are inverted.

Under Range: A blinking “0.0” indicates that the sample absorbs less

light than the zero reference. Check the procedure and make sure you use
the same cuvette for reference (zero) and measurement.
Over Range: A flashing value of the maximum concentration indicates
the reading is over range. Dilute the sample and re-run the test.

Battery Low: The battery must be replaced soon.

Dead Battery: This indicates that the battery is dead and must

be replaced. Once this indication is displayed, normal operation of
the instrument will be interrupted. Change the battery and restart
the meter.

For more details about spare parts and accessories see “Accessories”.

HI772

Marine Alkalinity

INSTRUCTION MANUAL

Thank You

Thank you for choosing a Hanna Instruments product. Please read this instruction
manual carefully before using the instrument.

For more information about Hanna Instruments and our products, visit
www.hannainst.com.

For technical support, contact your local Hanna Instruments Office or e-mail us at
[e-mail]

Preliminary Examination

Specifications

Range 0.0 to 20.0 dKH
Resolution 0.1 d KH
Accuracy ±0.3 dKH ±5% of reading @ 25 ˚C / 77 ˚F
Light So urce light emit ting diode @ 610 nm
Light Detector silicon photocell

Method

Colori metric method. The reac tion causes a dis tinctive range of

colors from yel low to green to gree nish blue to develop
Environment 0 to 50 °C (32 to 122 °F); RH max 95% non -condensing
Batt ery Type 1.5V AAA (1 pc.)
Auto-off af ter 10 minutes of non-use
Dimensions 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
Weight 64 g (2.3 oz)

Functional Description

Cover

Cuvet te with cap

Cuvette holder

LCD Liquid Crystal Display

Operation Button

Errors and Warnings

Turn the meter on by pressing the button. All
segments will be displayed. When the display
shows “Add”, “C.1” with “Press” blinking, the
meter is ready.

Fill the cuvette with 10 mL of unreacted sample and
replace the cap. Place the cuvette into the meter and
close the meter’s cap.

Press the button. When the display shows “Add”,
“C.2” with “Press” blinking the meter is zeroed.

Remove the cuvette from the meter and unscrew
the cap. Using a 1 mL syringe carefully add exactly

1.00 mL of HI772S Reagent to the sample. Replace
the cap and gently invert 5 times. Place the cuvette
back into the meter.

Note: Pay attention not to spill reagent otherwise
full color development may be inhibited.

Press the button. The instrument directly displays
the concentration of alkalinity in dKH. Alkalinity
conversion:
1 dKH = 17.86 ppm CaCO

3

= 0.358 meq/L

The meter automatically turns off after 10 minutes.

10

mL

• It is important that the sample does not contain any debris.

• Whenever the cuvette is placed into the measurement cell, it must be
dry outside, and completely free of fingerprints, oil and dirt. Wipe it
thoroughly with HI731318 or a lint-free cloth prior to insertion.

• Shaking the cuvette can generate bubbles, causing higher readings. To
obtain accurate measurements, remove bubbles by swirling or by
gently tapping the cuvette.

• Do not let the reacted sample stand for too long after reagent is
added, as accuracy will be affected.

• After the reading it is important to immediately discard the
sample, otherwise the glass might become permanently stained.

HI772

To save the battery, the instrument shuts down after 10 minutes of non-use.
One fresh battery lasts for a minimum of 5000 measurements. When the battery is dead the
instrument will display “bAd” then ”bAt” for 1 second and then turns off.
To restart the instrument, the battery must be replaced with a new one.
To replace the instrument’s battery:

• Turn the instrument off by holding the button until the meter shuts off.

• Turn the instrument upside down and remove the battery cover with a screwdriver.

• Remove the battery from its location and replace it with a new one, inserting the negative

end first.

• Insert the battery cover and replace the screw with a screwdriver.

IST772 02 /17

Measurement Procedure

HI772S

Tips for an Accurate Measurement

Battery Management

Reagent sets

HI77 2-26 Reagent for 25 M arine Alkalinit y tests, 1 sy ringe and 1 tip

Other Accessories

HI 772-11 Marine Alkalinity Certif ied Standard Kit
HI731318 Cloth for w iping cuvett es (4 pcs.)
HI73 1321 Glass c uvetes (4 pcs.)
HI73 1225 Black Cuvette C ap for Checker HC (4 pc s.)
HI74 0028 P 1.5V A AA batter ies (12 pcs.)
HI740142P 1 mL gradua ted syringe (10 pcs.)
HI93703-50 Cuvette cleaning s olution (230 mL)

Accessories

Hanna I nstrument s reserves the r ight to modif y the design, c onstructi on, or appeara nce of its prod ucts
without advance notice.

Warranty

HI772 is warranted for a period of one year after date of purchase against defects in

workmanship and materials when used for their intended purpose and maintained
according to instructions. This warrant y is limited to repair or replacement f ree of charge.
Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not
covered. If service is required, contact your local Hanna Instruments Office. If under
warrant y, 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 Return
Goods Authorization number from the Technical Ser vice department and then send it with
shipping costs p repaid. When shipping any ins trument, make sure it is properly packed for
complete protection.

Recommendations for Users

Before using Hanna Instruments product s, make sure that they are entirely suitable for
your specific application and for the environment in which they are used. Operation of
these instruments may cause unacceptable interferences to other electronic equipment,
thus requiring the operator to take all necessary steps to correct such interferences. Any
variation introduced by the user to the supplied equipment may degrade the instrument ’s
EMC performance. To avoid damages or burns, do not put the instrument in microwave
oven. For yours and the instrument safety do not use or store the instrument in hazardous
environments.