wtw pHotoFlex pH Operating Manual page 97

®
pHotoFlex pH
Analysis specification
Blank value (reagent
blank value)
Citation forms
Detection procedure
Method
Program
Test set (test)
Zero adjustment
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The exact proceeding to carry out the detection procedure is described
in the analysis specification.
The evaluation of the photometric measurement always refers to the
comparison value of a sample without the substance to be determined
(reagent blank value). Thus the influence of the basic absorbance of
the reagents on photometric measurement is compensated for.
Cell Vessel to take a liquid sample for photometric measurements.
The cell material (mostly glass) must have certain optical features to
be suitable for photometry.
Different forms of representing a measured concentration value that
can be derived from each other.
The method to determine phosphate, e.g. delivers a measured value
for phosphorous P. This measured value can be alternatively quoted
in the citation forms, PO4, PO4-P or P2O5.
The detection procedure designates the general principle of how a
sample is brought into a form suitable for measurement.
Different methods can be based on the same detection procedure.
LED Light Emitting Diode
LEDs are used as the light source in the pHotoFlex
A method comprises a chemical detection procedure and special
method data (calibration line) that is required to evaluate the
measurement results.
How to carry out the method up to the photometric measurement is de-
scribed in the analysis specification.
The pHotoFlex
Furthermore, user-defined methods can be entered in the database as
well.
In the pHotoFlex
stored as programs.
Programs are called up via the assigned program number.
A test set contains all reagents that are required for the photometric
determination of the sample according to the analysis specification.
Adjusting a photometer with a water-filled cell.
The zero adjustment applies to measuring all measured parameters
(concentration, absorbance, transmission) of a photometer.
®
pH contains a database with methods (programs).
®
pH, methods with the relevant method data are
Lists
®
pH.
97