Spectroquant
®
Pharo 300 Operation
77
ba75703d07 04/2014
4.5.8 Sample blank value
By measuring and using a sample blank value, measurement errors due to
coloring and turbidity of the sample matrix can be eliminated to a large extent.
The sample blank value is a characteristic of the sample (coloration) to be
currently determined. It is diluted according to the used method but does not
contain any color reagents.
The pH value corresponds to that of the test sample.
Note
Due to the addition of reagents the sample is diluted. This can also change
the pH value of the sample. For this reason the blank sample also has to be
diluted and the pH value adjusted accordingly.
Validity The sample blank value applies to the next measurement only.
Single and multiple
determination
The sample blank value can be determined by single or multiple determina-
tion. With multiple determination, the sample blank value is calculated as the
median from the individual measured values.
Measuring the
sample blank value
Inserting a cell with barcode starts
a measurement.
If a cell without barcode is used:
Select the method manually
(see section 4.5.5).
The photometer is ready to mea-
sure.
1 Open the setting menu with
[Setup].
2 Select and confirm Sample blank
value.
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Concentration
Concentration
16.04.07 9:52
Please select method for measuring or insert
a barcoded cell or insert AutoSelector.
Setup
Method list Last method New Method
Concentration
16.04.07 9:52
To start measurement, insert cell or press
<START/ENTER>
51: 14558
NH
4
-N
16 mm
0.20 - 8.00 mg/l
Setup
Method list
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