Hanna Instruments HI774 Owner Manual
Tips for an Accurate Measurement
• 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 such 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.
Battery Management
To save the battery, the instrument shuts down after 7 minutes of non-use and 2 minutes
after reading.
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.
Recommendations for Users
Before using this product, make sure it is entirely suitable for your specific application and
for the environment in which it is used.
Any variation introduced by the user to the supplied equipment may degrade the meter’s
For yours and the meter’s safety do not use or store the meter in hazardous environments.
Reagent Sets
Other Accessories
Reagents for 25 Phosphate Ultra Low Range tests
Phosphate Ultra Low Range Certified Standard Kit
Cloth for wiping cuvettes (4 pcs.)
Glass Cuvettes and Caps for Checker® HC Colorimeters (2 pcs.)
Cuvette Seal Cap for Checker® HC Colorimeters (4 pcs.)
1.5V AAA batteries (12 pcs.)
Cuvette cleaning solution (230 mL)
• 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.
HI774 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.
IST774 10/18
Phosphate Ultra Low Range
Thank You
Functional Description
Thank you for choosing a Hanna Instruments product. Please read this instruction manual
carefully before using the instrument.
LCD Liquid Crystal Display
Preliminary Examination
Light Source
Light Detector
Battery Type
Auto-Shut off
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. Add the content of one packet of
HI774-0 reagent. Replace the cap and shake
gently for 2 minutes until the powder is
completely dissolved. Place the cuvette back
into the meter.
Press and hold the button until the timer is
displayed on the LCD (the display will show
the countdown prior to the measurement) or,
alternatively, wait for 3 minutes and press the
The instrument directly displays the
concentration of phosphate in ppm. The
meter automatically turns off after 2 minutes.
Cuvette holder
For technical support, contact your local Hanna Instruments Office or e-mail us at
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 with cap
For more information about Hanna Instruments and our products, visit www.hannainst.com.
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 HI774 meter is supplied complete with:
• Sample Cuvettes and Caps (2 pcs.)
• Reagents for 10 tests
• 1.5V AAA Battery (1 pc.)
• Instruction Manual and Quick Reference Guide
Measurement Procedure
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.
0.00 to 0.90 ppm
0.01 ppm
±0.02 ppm ±5% of reading @25 °C/ 77 °F
Light Emitting Diode @525 nm
Silicon Photocell
Under Range: A blinking “0.00” 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.
Adaptation of Standard Methods for the Examination of Water and
Wastewater, 20th edition, Ascorbic Acid method. The reaction between phosphate and the reagent causes a blue tint in the sample.
0 to 50 °C (32 to 122 °F); RH max 95% non-condensing
1.5V AAA (1 pc.)
After 7 minutes of non-use and 2 minutes after reading
86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
52 g (1.84 oz.)
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.
Hanna Instruments reserves the right to modify the design, construction or appearance of
its products without advance notice.
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