Hanna Instruments c 125 User Manual
12
VIEWING THE CALIBRATION DATE
• Turn the meter on and wait for the
• Turn the meter on and wait for the
display to show “----”.
• Press and hold the DATE/
key
and a “MM.DD” message appears
while the key is held.
while the key is held.
Note: The displayed date is the date entered by the user at the beginning of the
last calibration.
TIPS FOR ACCURATE OPERATION
The instructions listed below should be carefully followed during testing and during
calibration.
• All glassware that comes into contact with standards should be maintained
calibration.
• All glassware that comes into contact with standards should be maintained
clean. Wash with HI93703-50 cleaning solution and rinse with HI93703-0
or turbidity free water.
or turbidity free water.
• For consistent readings, it is recommended to perform measurement immediately
after collecting sample.
• To obtain a representative sample, gently mix the liquid before samples are
taken. Do not shake (to prevent air bubbles) and do not let the sample settle.
• Rinse the cuvette twice with 5 ml of the liquid to be tested for removing the effect
of dust or any previous liquid. Gently pour the liquid down the side of the cuvette
to reduce air bubbles.
to reduce air bubbles.
• Try to tighten the cuvette cap always to the same degree.
• Before inserting the cuvette into the instrument, wipe it with soft, lint-free tissue.
• Before inserting the cuvette into the instrument, wipe it with soft, lint-free tissue.
Handle cuvettes so that no fingerprints can get on the areas where light passes
(approximately 2 cm/1 inch from the bottom of the cuvette).
(approximately 2 cm/1 inch from the bottom of the cuvette).
• Discard the sample soon after the reading is taken to avoid permanently clouding
the glass.
If any problem is experienced during measurements, please contact your dealer or
the nearest Hanna Instruments Customer Service Department.
the nearest Hanna Instruments Customer Service Department.