Patent ID: 8274658
Filing Date: 2012-09-25
Classification: G01N

Abstract:
1. An optical measuring head for a duct gas monitoring system, the measuring head being mounted to an outer wall of a gas duct through which the duct gas flows, comprising: a longitudinal chamber which, at a first end, opens into the gas duct and, at a second end, contains an active optical component, wherein the chamber is flushed with a purge gas which, after flushing the chamber, is discharged directly into the gas duct, wherein a gas line is installed between a first section of the chamber, defined in part by the second end, and an interior of the gas duct at a point upstream of a discharge point, wherein the discharge point is at the first end of the chamber which opens into the gas duct, and wherein the purge gas is a branch-off from the duct gas.