Sensor Electronics SEC Millenium Series Instruction And Operation Manual page 468

Infrared Absorption Spectrum for Carbon Dioxide
100%
Reference
Absorption
Band
Band
0%
Wavelength
The dual channel receiver is a single wafer, double filtered, dual receiver with an internal optical barrier.
The elements are perfectly matched resulting in overall stability and superior performance throughout the
entire temperature range.
Dual Channel Infrared Light
Waveguide
Receiver Source
Wiring
Connections
Window
Window
Waveguide
Hydrophobic Filter
Collar
Using a dual channel receiver there is no need to use any special lenses or beam splitters to achieve the
different measurement bands.
The SEC MILLENIUM utilizes a unique patent pending feature, the AutoAC circuit. The AutoAC circuit is
an automatic analog control circuit, which allows the SEC MILLENIUM to be calibrated for CO2, provided
that a calibration quality level of the gas is available.
The optics can be easily disassembled for cleaning. This does not require powering the unit down and does
not compromise the units' explosion proof rating. The device will self compensate for dirty optics until a
point in which the optical surfaces are completely obscured.
There are no consumable components contained in this product.
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