10
The flashing digits indicate that:
1) the month can be set
2) the day can be set
“Storage”: this prompt appears for 1 second at the end of the
calibration procedure
, to indicate that the calibration data has
been stored.
“Error”: the concentration of the calibration solution used is not correct.
Repeat the
calibration procedure
with the right standard solution, and
verify it is not expired. If the calibration procedure fails again, contact your
dealer or the nearest Hanna Customer Service Center.
ERROR MESSAGES
a) on zero reading
This indicates that the zeroing procedure failed due to a low signal-to-
noise ratio. In this case press ZERO again.
“No Light”: the instrument cannot adjust the light level. Please check that
the sample does not contain any debris.
“Light Low”: there is not enough light to perform a measurement. Please
check the preparation of the zero cuvet.
“Light High”: there is too much light to perform a measurement. Please
check the preparation of the zero cuvet.
b) on sample reading
There is too much light for the sample measurement. Please check if the
right sample cuvet is inserted.
“Inverted”: the sample and the zero cuvet are inverted.
“Zero”: a zero reading was not taken. Follow the instruction in the
measurement procedure
for zeroing the meter.
11
Under range. A blinking "0.00" indicates that the sample absorbs
less light than the zero reference. Check the procedure and make
sure you use the same cuvet for reference (zero) and measurement.
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 re-run the test.
A flashing value lower than the maximum concentration indicates a
low signal-to-noise ratio condition. In this case accuracy of the result
is not guaranteed. Repeat the
measurement procedure
.
The instructions listed below should be carefully followed during testing to ensure best accuracy.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
• Suspended matter in large amounts may cause
interference, therefore this should be removed
by prior filtration.
• 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.
• It is important that the sample does not contain
any debris. This would corrupt the reading.
• Each time the cuvet is used, the cap must be
tightened to the same degree.
• Whenever the cuvet is placed into the
measurement cell, it must be dry outside, and
completely free of fingerprints, oil or dirt. Wipe
it thoroughly with
HI 731318
(tissue for
wiping cuvets, see chapter ACCESSORIES) or a
lint-free cloth prior to insertion.
