Hach-Lange LICO 690 User Manual - Manual (Page 22)

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Standard programs
5.1.3 Main menu
A variety of modes may be selected from the Main Menu. The
following table briefly describes each menu option.
There is a toolbar on the right-hand side of the screen. Press to
activate the various functions.
Table 3 Main Menu options
Option Function
Color measurement
The COLOR MEASUREMENT MODE is used to determine color values such as Hazen,
Gardner and Saybolt. The LICO 690 also offers three-dimensional, absolute
colorimetric values, as well as the color scales of CIE L*a*b*, Hunter Lab or the
European Pharmacopoeia.
Color difference measurement
(only LICO 690)
The mode for COLOR DIFFERENCE MEASUREMENT is used to determine a
quantitative color difference between a reference (R) and a sample (P) in the
three-dimensional color space (CIE L*a*b* or Hunter Lab). In this mode, an additional
reference memory for up to 100 references is available.
Photometry
(only
LICO 690)
Single Wavelength
Single wavelength readings are:
Absorbance readings: The light absorbed by the sample is measured in absorbance
units.
Transmittance reading (%): Measures the percent of the original light that passes
through the sample and reaches the detector.
Concentration readings: A concentration factor can be entered to enable the
measured absorbance values to be converted into concentration values.
Multi Wavelength
In the Multi Wavelength mode, absorbance (Abs) or percentage transmittance (%T) is
measured at up to four wavelengths and absorbance differences and absorbance
relationships are calculated. Simple conversions into concentrations can also be
carried out.
Time course
The time scan records the absorbance or % transmittance at a wavelength over a
defined time.
Wavelength Scan
A wavelength scan shows how the light from a sample is absorbed over a defined
wavelength spectrum. This function can be used to determine the wavelength at
which the maximum absorbance value can be measured. The absorbance behavior is
displayed graphically during the scan.
System Checks
The "System Check" menu contains a number of options, such as instrument
information, optical checks, instrument backup, service times, instrument update,
settings for analytical quality assurance and lamp history.
Recall measurement data
Saved data can be retrieved, filtered, sent to a printer, memory stick or PC and
deleted.
Instrument Setup
This menu is used to configure user-specific and/or process-specific settings:
operator ID, date and time, security settings, saved data, sound, PC and printer and
energy management.