HI720
Calcium Hardness
INSTRUCTION MANUAL
HI720
Before using Hanna Instruments products, make sure that they are entirely suitable for
your specific application and for the environment in which they are used. Operation of
these instruments may cause unacceptable interferences to other electronic equipment, thus
requiring the operator to take all necessary steps to correct such interferences. Any variation
introduced by the user to the supplied equipment may degrade the instrument’s EMC
performance. To avoid damages or burns, do not put the instrument in microwave oven. For
yours and the instrument safety do not use or store the instrument in hazardous environments.
Recommendations for Users
Accessories
Reagent Sets
HI720-25
Reagents for 50 Calcium Hardness Tests
Other Accessories
HI720-11
Calcium Hardness Certified Standard Kit
HI731225
Cuvette Black Cap for Checker
®
HC Colorimeters (4 pcs.)
HI731318
Cloth for wiping cuvettes (4 pcs.)
HI731321
Glass Cuvettes and Seal Cap for Checker
®
HC Colorimeters (4 pcs.)
HI731353
Cuvette Seal Cap for Checker
®
HC Colorimeters (4 pcs.)
HI740028P
1.5V AAA batteries (12 pcs.)
HI93703-50
Cuvette cleaning solution (230 mL)
IST720 05/18
HI720
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.
Warranty
• 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.
Tips for an Accurate Measurement
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.
Battery Management
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