Hanna Instruments HI 755 - Manual (Page 2)

• 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.
• Fill the cuvette with 10 mL of unreacted
sample and replace the cap. Place the cuvette
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, open it and using a
1 mL syringe carefully add exactly 1.00 mL
of Alkalinity Reagent to the sample. Replace
the cap and gently invert 5 times. Place the
cuvette back into the meter.
Note : Pay attention not to spill reagent otherwise
full color development may be inhibited.
• Press the button. The instrument directly
displays the concentration of alkalinity in
ppm of CaCO
3
. Alkalinity conversion:
1 ppm CaCO
3
= 0.02 meq/L
= 0.056 dkH
The meter automatically turns off after 10
minutes.
10 mL
• 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 or dirt. Wipe it throughly 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 discard the sample immediately , otherwise
the glass might become permanently stained.
REAGENT SETS
HI 755-26
Liquid Reagents for 25 Alkalinity tests, 1 syringe and 1 tip
OTHER ACCESSORIES
HI 740142
1 mL graduated syringe
HI 740028 1.5V AAA batteries (4 pcs)
HI 731318 Cloth for wiping cuvettes (4 pcs)
HI 731321 Glass cuvettes (4 pcs)
HI 731225 Cuvette cap for checker HC (5 pcs)
HI 93703-50 Cuvette cleaning solution (230 mL).
Recommendations for Users
Before using these products, make sure that they are entirely suitable for your specific application and for
the environment in where they are used.
Operation of these instruments may cause unacceptable interferences to other electronic equipments, thus
requiring the operator to take all necessary steps to eliminate 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 the microwave oven. For your safety do not use or
store the instrument in hazardous environments.
For additional information, contact your
dealer or the nearest
Hanna Customer Service Center.
To find the Hanna Office in your area,
visit our web site
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 and
appearance of its products without advance notice.
Battery management
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, follow the steps:
• 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.
• Insert the battery cover and put back the screw with a screwdriver.
IST755 1 1/10
Measurement procedure: Accessories: Tips for an accurate measurement