Hanna Instruments HI 83740 - Manual (Page 10)

10
ERROR MESSAGES
The meter has lost its configuration. Contact your dealer or the nearest
Hanna Customer Service Center.
“Light high”: there is too much light to perform a measurement.
Please check the preparation of the zero cuvet.
“No Light”: the instrument cannot adjust the light level. Please check
that the sample does not contain any debris.
a) on zero reading:
A flashing value of the maximum concentration indicates an over range
condition. The concentration of the sample is beyond the programmed
range: dilute the sample and measure again.
The sample absorbs less light than the zero reference.
Check the procedure.
“Inverted”: the sample and the zero cuvet are inverted.
b) on sample reading:
Indicates that the batteries are dead and must be replaced. After this
message appears, the instrument is switched off. Change the batteries
and restart the meter.
“Light low”: there is not enough light to perform a measurement.
Dilute the sample. See “General tips for an accurate measurement“
(page 12).
11
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• Use the supplied plastic pipette for adding the exact amount
of wine sample (15 mL) or reagents A or B (up to the 20
mL mark) to the graduated glass vials. The liquid in the
vial forms a convexity on the top; the bottom of this
convexity must be at the same level of the mark.
• To transfer the supernatant organic solvent from the vials to the cuvets use two different clean
1 mL pipettes, one for the zero and one for the sample.
a) squeeze the bulb of the pipette;
b) insert the plastic pipette into the supernatant organic solvent and release the bulb slowly,
paying attention not to transfer the wine sample too;
c) fill a cuvet with organic solvent by squeezing the bulb of the pipette.
Repeat step a), b) and c) until all the organic solvent is transferred. Ensure that at least 1/3
of the cuvet is filled with organic solvent, otherwise erroneous results will be obtained.
Notes:
- If some wine sample is transferred too, this does not interferes with the method.
- Try to avoid transferring suspended solids that might be present.
- If necessary, air bubbles can be removed tapping the vials gently on the table.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT