Heated Graphite Scrubber to Reduce Interferences in Ozone Monitors

摘要

The present invention provides a means of greatly reducing interferences from mercury vapor, UV-absorbing compounds and water vapor in the measurement of ozone by UV absorbance. A heated graphite scrubber destroys greater than 99% of ozone passing through it while reducing biases from typical atmospheric UV-absorbing interferents by large factors compared to conventional ozone scrubbers. Substitution of a heated graphite scrubber in place of traditional ozone scrubbers such as hopcalite, metal oxides and heated silver scrubbers, results in a more accurate measurement of ozone by reducing the responses to UV-absorbing interferences and water vapor. The heated graphite scrubber also may be used in combination with other ozone sensors, such as electrochemical and HMOS sensors, to provide a reference measurement with ozone selectively removed and thus greatly reduce contributions from interfering species in those measurement devices as well.

主权项

1. An ozone scrubber comprising:
a chamber having a heater and at least one surface comprised of graphite; the heater maintaining the graphite at a chosen temperature when the ozone scrubber is functioning; the chamber being adapted to allow a chosen gas flow through the chamber and come into contact with the graphite surface and then flow out of the chamber; wherein a majority of ozone in the chosen gas is scrubbed from the chosen gas by the time the gas flows out of the chamber.