Hanna Instruments HI 83741 - 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 lamp is not working because of a malfunction. Contact
your dealer or the nearest Hanna Customer Service Center.
a) on zero reading: a) on zero reading: a) on zero reading: a) on zero reading: 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 pro-
cedure and make sure you use the same cuvet for reference (zero)
and measurement.
“Inverted”: the sample and the zero cuvet are inverted.
b) on sample reading: b) on sample reading: b) on sample reading: b) on sample reading: 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.
Please dilute the sample five times (see “General tips for an accurate
measurement”, page 12).
11
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• For a correct filling of the cuvet: the liquid in the
cuvet forms a convexity on the top; the bottom of
this convexity must be at the same level of the 10
mL mark.
• For dosing the wine sample, we recommend to
use the supplied Hanna HI 731341 automatic
pipette.
For a correct use of the Hanna automatic pipette,
please follow the related Instruction Sheet.
• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
Hanna
automatic pipette
• In order to avoid reagent leaking and to obtain
more accurate measurements, it is recommended
to close the cuvet first with the supplied HDPE
plastic stopper
and then with the black
cap.
• Diluting procedure: Use the 1000 µL automatic
pipette to add twice exactly 1 mL of sample to an
empty cuvet. Then fill the cuvet up to the
mark with iron-free deionized water. Close the
cap and invert the cuvet several times. This is the
diluted sample. Follow the measurement procedure.
The final reading must be multiplied by 5 to
compensate for dilution.
x2
(a) (b) (c)
10 mL