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, invert 5 times and unscrew
the cap. Use the 1 mL syringe and add exactly
1 mL of
HI755S
Marine Alkalinity reagent to
the sample. Replace the cap and gently invert
5 times.
Note:
Pay attention not to spill reagent
otherwise full color development may be
inhibited.
• Insert the cuvette into the checker and close the
cap. Press the ON/OFF button. The instrument
displays the alkalinity concentration in ppm.
Alkalinity conversion:
1 ppm CaCO
3
= 0.02 meq/L
= 0.056 dkH
The checker automatically turns off 10 minutes
after reading.
1 mL
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
HI755
is delivered in a case with custom insert and is supplied with:
• Sample cuvette and cap (2 pcs.)
• Marine Alkalinity reagent starter kit (reagents for 25 tests)
• 1 mL syringe with tip (1 pc.)
• 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
HI755
Marine Alkalinity handheld checker is designed to accurately determine
alkalinity levels in saltwater aquariums.
HI755
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 to 300 ppm (as CaCO
3
)
Resolution
1 ppm
Accuracy
±5 ppm ±5% of reading @ 25 °C (77 °F)
Light source
Light Emitting Diode @ 610 nm
Light detector
Silicon photocell
Method
Colorimetric Method. The reaction causes a distinctive range
of colors from yellow to greenish blue to develop.
Environment
0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing
Battery type
1.5V AAA Alkaline
Auto shut-off
After 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 & 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”
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.