Measurement Procedure
• Press the ON/OFF button to turn the checker
on. All segments will be displayed for a few
seconds, followed by “Add”
,
“C.1” with “Press”
blinking.
• Fill the cuvette with 10 mL of unreacted sample
and replace the cap. Insert the cuvette into the
checker and close the cap.
• Press the ON/OFF button. When the display
shows “Add”
,
“C.2” with “Press” blinking, the
checker is zeroed.
• Remove the cuvette, unscrew the cap and add
the content of one packet of
HI774-0
Marine
Phosphate Ultra Low Range reagent. Replace
the cap and shake gently for about 2 minutes
until the powder is completely dissolved.
• Insert the cuvette into the checker and close the
cap. Press and hold the ON/OFF button. The
display will show the countdown prior to the
measurement. Alternatively, wait 3 minutes
and press the button.
• When the timer ends the checker will perform
the reading. The instrument displays the
phosphate concentration in ppm. The checker
automatically turns off 2 minutes after reading.
Dear Customer,
Thank you for choosing a Hanna Instruments product. Please read this
instruction manual carefully before using the Checker
®
HC handheld
colorimeter. For more information about Hanna Instruments and our
products, visit www.hannainst.com or e-mail us at [email protected].
For technical support, contact your local Hanna Instruments Office or e-mail
us at [email protected].
Preliminary Examination
Remove the Checker
®
HC handheld colorimeter and accessories from the packing
material and examine it carefully. If you require any further information, please
contact Hanna Instruments technical support team.
Each
HI774
is delivered in a case with custom insert and is supplied with:
• Sample cuvette and cap (2 pcs.)
• Marine Phosphate Ultra Low Range reagent starter kit (reagents for 10 tests)
• 1.5V AAA Alkaline battery (1 pc.)
• Instruction manual
Note:
Save all packing material until you are sure that the Checker
®
HC
handheld colorimeter works correctly. Any damaged or defective item must
be returned in its original packing material with the supplied accessories.
General Description & Intended Use
HI774
Marine Phosphate Ultra Low Range handheld checker is designed to
accurately determine phosphate level in applications such as aquaculture and
drinking, agricultural and wastewaters.
HI774
features a single-button operation system and is easy to use.
The large LCD is easy to read and the auto shut-off feature assures the battery
will not be drained.
Specifications
Range
0.00 to 0.90 ppm
Resolution
0.01 ppm
Accuracy
±0.02 ppm ±5% of reading @ 25 °C (77 °F)
Light source
Light Emitting Diode @ 525 nm
Light detector
Silicon photocell
Method
Adaptation of Standard Methods for the Examination of
Water & Wastewater, 20
th
Edition, Ascorbic Acid Method.
The reaction between phosphate and the reagent causes a
blue tint in the sample.
Environment
0 to 50 °C (32 to 122 °F); RH max. 95% non-condensing
Battery type
1.5V AAA Alkaline
Auto shut-off
After 7 minutes of non-use and 2 minutes after reading
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 & LCD Display
Cap
Cuvette with cap
Cuvette holder
LCD (Liquid Crystal Display)
ON/OFF button
Errors & Warnings
The checker shows clear warning messages when erroneous conditions appear and
when measured values are outside the expected range. The information below
provides an explanation of the errors and warnings, and the recommended action
to be taken.
Light High:
There is an excess amount of ambient light
reaching the detector. 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 cuvettes are
inverted. Swap the cuvettes and repeat the measurement.
Under Range:
A blinking “0.00”
indicates that the sample
absorbs less light than the zero reference. Check the
measurement procedure and make sure to use the same cuvette
for reference (zero) and measurement.
Over Range:
Maximum concentration value displayed blinking
indicates the measured value is outside the limits of the method.
Verify that the sample does not contain any debris. Dilute the
sample and repeat the measurement.
Battery Low:
Battery level is too low for the checker to function
properly. Replace the battery with a new one.
Drained Battery:
The battery is drained and must be replaced.
Replace the battery with a new one and restart the checker.
