Overview | 1-9
Options
Several options are available
• Dual cell capability
• High temperature oven
• Multiple analytes
• High temperature sample cell
• Herriott (long path length) sample cell
• Space-coupled optics
Herriott Sample Cell Option
This option is recommended for applications that require enhanced performance at
low analyte concentrations. For example, a moisture application requiring a range
of 0-50 or 0-100 ppm, and a Limit Of Detection (LOD) lower than the standard 5
ppmV, would benet from this option.
The Herriott sample cell is constructed with two mirrors, compared to the standard
cell with one. The two mirrors are facing each other at both ends of the sample
cell. The laser light is reected back and forth between the mirrors many times,
increasing the path length of the light through the sample gas. This increase in path
length creates a proportional increase in sensitivity to the analyte. The rest of the
analyzer remains the same as for a standard sample cell.
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