YSI pHotoFlex pH Handheld Colorimeter - Manual (Page 95)

pHotoFlex
®
pH Lists
95 ba76123e01 02/2013
Analysis specification The exact proceeding to carry out the detection procedure is described
in the analysis specification.
Blank value (reagent
blank value)
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.
Citation forms 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.
Detection procedure 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
®
pH.
Method 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
®
pH contains a database with methods (programs).
Furthermore, user-defined methods can be entered in the database as
well.
Program In the pHotoFlex
®
pH, methods with the relevant method data are
stored as programs.
Programs are called up via the assigned program number.
Test set (test) A test set contains all reagents that are required for the photometric
determination of the sample according to the analysis specification.
Zero adjustment Adjusting a photometer with a water-filled cell.
The zero adjustment applies to measuring all measured parameters
(concentration, absorbance, transmission) of a photometer.