Error Marks - Hitachi ZA3000 Series Instruction Manual

4.1 Data Table

4.1.1 Error Marks

Indication
E Light intensity is 120 or
higher.
X Absorbance of STD2 to 10
is 0.001 or lower.
C Absorbance of unknown
sample is at least 5%
higher than the maximum
absorbance of standard
sample.
L The concentration of the
unknown sample was
lower than the detection
limit.
B Reference signal is higher
than 1.5.
A Sample signal is higher
than 1.5.
R Rollover has occurred due
to high concentration.
(This function is active in
"Manual" mode.)
S In the peak width method,
the width of interest has
not been found (not been
determined), and the peak
height has been used as
an alternative.
F Concentration could not be
determined
O The concentration exceeds
the allowable numeric
range for display.
H The background correction
has not been performed
properly.
The error marks are indicated in the following order of priorities: H > E > A > B > X > S > R > F > L > C
Measurement result data may be accompanied with an error
mark.
Although measurement can be continued by ignoring an error
mark, data may lose reliability. It is therefore recommended to
take a corrective measure listed below.
Cause
In manual measurement, execute auto-zero.
If lamp warm-up is not adequate in the autosampler
mode, this mark may be attached to data for some time
after start of measurement. In this case,
remeasurement is required.
If this mark still appears despite warm-up for 10 to
15 minutes or longer, deterioration or abnormal
discharge of the lamp can be thought. Check the
lamp.
Make sure each standard sample has been prepared in
correct concentration.
Analyst should judge the allowable absorbance range
above the upper limit of working curve, that the
absorbance of an unknown sample may reach.
When necessary, change concentration of the
unknown sample or standard sample and measure
again.
Check if a wrong sample was set.
The background absorbance exceeds the allowable
range of correction. Dilute the sample or reduce the
sample matrix.
The linear range of general working curve may be
exceeded, though this depends on element.
So, dilute the sample and measure again.
Dilute the sample and measure again.
The peak width method is not used for flame analysis.
Change the peak width to be provided, and carry out
measurement again.
If the peak is too steep, its width may not be
determined uniquely.
The working curve is not a continuously increasing
function (two concentration values correspond to one
absorbance value). Make sure the order of standard
samples is correct and the concentrations are
appropriate. Then, carry out measurement again.
Input concentration correction again so that the
corrected concentration value will not become
extremely large. Or dilute a sample and measure
again.
Carry out measurement again.
Remedy
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