Hach-Lange LICO 690 User Manual - Manual (Page 71)

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Standard programs
5.7 Photometry (LICO 690 only)
In the photometry mode, photometric measurements can be
carried out as:
• Single wavelength measurements
• Multi wavelength measurements
• Time course
• Wavelength scans
5.7.1 Single Wavelength (absorbance, concentration and transmittance readings)
The Single Wavelength mode can be used in three ways. For
sample readings at a single wavelength, the instrument can be
programmed to measure the absorbance, % transmittance or
concentration of the analyte.
• Absorbance readings: The light absorbed by the sample is
measured in absorbance units.
• % Transmittance measures the percent of the original light
that passes through the sample and reaches the detector.
• Turning on the concentration factor allows selection of a
specific multiplier for converting absorbance readings to
concentration. In a graph of concentration versus the
absorbance, the concentration factor is the slope of the line.
5.7.1.1 Set up Single Wavelength mode
1. In the main menu, press the Single Wavelength menu
option.
2. Press Options for Parameter Setup.
Table 7 Options for Single Wavelength
Options Description
More For further Options
Save icon
Symbol: Store Data, if Instrument Setup > Data Log Setup > Auto Store: Off is selected.
Symbol: Recall Data, if Instrument Setup > Data Log Setup > Auto Store: On is selected.
% Trans/Abs To switch to % transmittance, concentration or absorbance readings