A transducer for nondispersive infrared gas analysis has heaters for the data and reference detectors to maintain the detectors at a selected temperature. A heater is also provided to heat the casing of an airway adapter associated with the transducer to a temperature high enough to keep condensation...http://www.google.com.au/patents/US5146092?utm_source=gb-gplus-sharePatent US5146092 - Gas analysis transducers with electromagnetic energy detector units
