Thermo Scientific MIRAN 205B Series Instruction Manual page 69

compensate for this effect, the analyzer employs an analysis wavelength which is
responsive mainly to water vapor. Intensity changes at this and the reference wavelength
may be used to correct for changes in sample absorbance due to variable water vapor
levels after zeroing. The humidity compensation routine should be applied when the
analyzer is being used as a continuous monitor since humidity levels can vary over the
duration of the sampling period. As with reference compensation, utilizing the humidity
compensation algorithm increases the cycle time since water vapor is an additional
wavelength point to be collected. The humidity compensation must be enabled for the
correction to take place. When humidity is activated, the batch mode should be enabled.
This insures that the compensation of the analytical wavelengths is properly performed as
the sample remains consistent.
This compensation should not be invoked if it is known in advance that the sample air is
very, very dry (<10% RH at reference conditions).
Analysis Preferences
The Analysis Preference menu configures various operational features of the analyzer.
To access the Preference Menu, press
The current preferences are displayed on the left and the menu of selection on the right.
┌────────────────────────────────────────┐
│╒════════SUMMARY════════╕PREFERENCE MENU│
││
││
││
││ Fault action: Beep
││ Alarm action: ErrScrn │5=Alarm action │
││
│└───────────────────────┘
└────────────────────────────────────────┘
(Preferences) from the Analysis Setup Menu 1.
4
Zero save: Manual
Arrow keys: Location│2=Arrow keys
Log warning: Off
Purge flag: Enabled │6=Purge flag
Analysis Preference Menu
7-15
Chapter 7 Configuration and Setup
│1=Zero save │
│
│3=Log warning │
│4=Fault action │
│
│