The UV light intensities of each cell are measured by detectors A and B. When the solenoid valves switch the reference and sample gas streams to opposite cells, the light intensities are ignored for several seconds to allow the cells to be flushed. The Model 49i calculates the ozone concentration for
KLC−
=e
oI I
Introduction Specifications
Thermo Fisher Scientific Model 49i Instruction Manual 1-3
each cell and outputs the average concentration to the front panel display, the analog outputs, and also makes the data available over the serial or ethernet connection