Gardner LCS IV User Manual

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.

The 

 is used to determine color values such as Hazen, 

Gardner and Saybolt. The LCS IV also offers three-dimensional, absolute colorimetric 
values, as well as the color scales of CIE L*a*b*, Hunter Lab or the European 
Pharmacopoeia.

The mode for 

 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.

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.

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.

The time scan records the absorbance or % transmittance at a wavelength over a 
defined time.

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.

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.

Saved data can be retrieved, filtered, sent to a printer, memory stick or PC and 
deleted.

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.