•
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
HI 720A-0
reagent, swirl to mix.
•
Add 0.5 mL of
HI 720B-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
HI 720C-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.
REAGENT SETS
HI 720-25
Reagents for 50 Calcium Hardness Tests
OTHER ACCESSORIES
HI 720-11
Calcium Hardness Certified Standard Kit
HI 731318
Cloth for wiping cuvettes (4 pcs.)
HI 731321
Glass cuvettes (4 pcs.)
HI 731225
Black Cuvette Cap for Checker HC (4 pcs.)
HI 740028P
1.5V AAA batteries (12 pcs.)
HI 93703-50
Cuvette cleaning solution (230 mL)
Recommendations for Users
w w w . h a n n a i n s t . c o m
Hanna Instruments
reserves the right to modify the design, construction or
appearance of its products without advance notice.
Battery management
IST720 02/16
Measurement procedure:
Accessories:
Tips for an accurate measurement
For additional information, contact your
dealer or the nearest
Hanna Customer Service Center.
To find a Hanna Office in your area,
visit our web site:
• 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
HI 731318
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.
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.
Before using this product, make sure that it is entirely suitable for your specific application and for the
environment in which it is used.
Operation of this instrument may cause unacceptable interferences to other electronic equipment, thus
requiring the operator to take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may degrade the instrument’s EMC
performance.
To avoid damage or burns, do not put the instrument in microwave oven. For the safety of you and the
instrument do not use or store the instrument in hazardous environments.
10 mL
#1
#2
10 mL
#2
#1
#1
