Hanna Instruments HI772 Owner Manual
Tips for an Accurate Measurement
Recommendations for Users
• 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.
Before using Hanna Instruments products, make sure that they are entirely suitable for your
specific application and for the environment in which they are used. Any variation introduced
by the user to the supplied equipment may degrade the meter’s performance. For yours and
the instrument safety do not use or store the instrument in hazardous environments.
Battery Management
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.
Marine Alkalinity
Reagent sets
Reagents for 25 Marine Alkalinity tests, 1 syringe and 1 tip
Other Accessories
Marine Alkalinity Certified Standard Kit
Cloth for wiping cuvettes (4 pcs.)
Glass Cuvettes and Caps for Checker® HC Colorimeters (2 pcs.)
1.5V AAA batteries (12 pcs.)
1 mL graduated syringe (10 pcs.)
Cuvette cleaning solution (230 mL)
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 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 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 Return 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.
IST772 07/18
Thank You
Functional Description
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
For technical support, contact your local Hanna Instruments Office or e-mail us
at tech@hannainst.com
Cuvette with cap
LCD Liquid Crystal Display
Operation Button
Errors and Warnings
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.
0.0 to 20.0 dKH
0.1 dKH
±0.3 dKH ±5% of reading @25 °C/77 °F
Light Source
Light Emitting Diode @610 nm
Light Detector
Silicon Photocell
Colorimetric method. The reaction causes a distinctive range of
colors from yellow to green to greenish blue to develop.
0 to 50 °C (32 to 122 °F); max 95% RH non-condesing
Battery Type
1.5V AAA (1 pc.)
Auto-Shut off
After 10 minutes of non-use
86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
52 g (1.84 oz.)
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.
Cuvette holder
Preliminary Examination
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 Guide
Measurement Procedure
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.
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 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
Press the button. The instrument directly displays
the concentration of alkalinity in dKH. Alkalinity
1 dKH
= 17.86 ppm CaCO3
= 0.358 meq/L
The meter automatically turns off after 10 minutes.
Hanna Instruments reserves the right to modify the design, construction or appearance of
its products without advance notice.
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