Operation Spectroquant
®
Pharo 300
90
ba75703d07 04/2014
4.5.11 Automatic Turbidity correction
The Turbidity correction function activates the automatic recognition and
compensation of the light absorption caused by turbid substances.
After activating the function remains permanently switched on. Measured val-
ues that were measured with Turbidity correction are labeled with [TURB]
(turbidity correction) on the display and in the documentation (printout and
memory).
The Turbidity correction function is not active in the delivery condition.
Note
The setting for automatic turbidity correction is used with all methods where
the automatic turbidity correction makes sense. The photometer automati-
cally decides whether or not to use the function.
Switching on the
turbidity correction
The automatic turbidity correction is activated and deactivated in the setting
menu of the concentration measurement (see section 4.5.6 S
ETTINGS FOR
C
ONCENTRATION MODE).
4.5.12 Programming / modifying user-defined methods
Overview For Concentration mode, you can develop and store yourself user-defined
methods under the method numbers 1001 to 1100. The photometer software
supports you when creating the methods.
Calibration data and
calibration function
In photometry, the calibration function describes the dependency between
the measured parameter (e.g. concentration) and the photometric measure-
ment result (e.g. absorbance) of a sample. The knowledge of this depen-
dency is a prerequisite for the development of a photometric method. The
calibration function is usually determined by means of a series of measure-
ments with standard solutions of known concentrations (nominal value), e.g.
a 10-point calibration.
Note
In measuring operation, the reverse calibration function is used to output the
measured absorbance as a concentration value.
Line types The dependency between the nominal value and absorbance is often linear
in a wide range as shown in the following example:
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