Measuring temperature and humidity in the breathing circuit

Respir Care Clin N Am. 1998 Jun;4(2):229-42.


Accurate measurement of temperature and humidity in the breathing circuit can be a difficult task. This article introduces basic humidity concepts, outlines the problems that are unique to the breathing circuit, and describes the various methods that are available to measure temperature and humidity. Recommendations are made on how to measure temperature and humidity in four commonly encountered situations.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Humans
  • Humidity*
  • Mass Spectrometry
  • Monitoring, Intraoperative / instrumentation
  • Monitoring, Intraoperative / methods*
  • Pulmonary Gas Exchange / physiology
  • Respiration, Artificial / instrumentation*
  • Respiration, Artificial / methods
  • Respiratory Function Tests / instrumentation
  • Respiratory Mechanics / physiology*
  • Temperature*
  • Thermometers