• 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.
• Rinse a graduated beaker several times with
unreacted sample, before filling it to the 50
mL mark with sample.
• Add 0.5 mL of
HI720A-0
reagent, swirl to mix.
• Add 0.5 mL of
HI720B-0
reagent, swirl to mix.
Use this solution to rinse 2 cuvettes before
filling them both up to the 10 mL mark.
• Add 1 drop of
HI720C-0
reagent to one cuvette
(#1), replace the cap and invert the cuvette
several times to mix. This is the blank.
• Place the blank (#1) 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.
• Insert the second cuvette (#2) into the meter
and press the button.
• The meter directly displays the concentration of
calcium hardness (CaCO
3
) in ppm. The meter
automatically turns off after 10 minutes.
#1
#2
#1
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
[email protected].
Find your local Hanna Instruments Office on 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
HI720
meter is supplied complete with:
• Sample Cuvettes and Caps (2 pcs.)
• Reagents for 50 tests
• 100 mL Plastic Beaker (1 pc.)
• 1 mL Syringes with Tips (2 pcs.)
• 1.5V AAA Battery (1 pc.)
• Instruction Manual and Quick Reference Guide
Preliminary Examination
Range
0.00 to 2.70 ppm
Resolution
0.01 ppm
Accuracy
±0.20 ppm ±5% of reading @ 25 °C / 77 °F
Light Source
Light Emitting Diode @525 nm
Light Detector
Silicon Photocell
Method
Adaptation of the Standard Methods for the Examination of Water and
Wastewater, 18
th
edition, Calmagite method. The reaction between
calcium and reagents causes a reddish-violet tint in the sample.
Environment
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
Dimensions
86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
Weight
52 g (1.84 oz.)
Specifications
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
“0.00”
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.
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.
Cover
Cuvette with cap
Cuvette holder
LCD Liquid Crystal Display
Operation Button
Functional Description
Errors and Warnings
Measurement Procedure
Hanna Instruments reserves the right to modify the design, construction or appearance of
its products without advance notice.
All manuals and user guides at all-guides.com
