title: [Suitability of capacitive sensors for measuring relative humidity in anesthetic gas systems].
abstract: A capacitive sensor was tested for its suitability for measuring relative humidity in an anaesthetic gas circuit. The valvo sensor PH1 was tested using various different anaesthetic gas mixtures. Measuring accuracy was influenced neither by such volatile anaesthetics as isoflurane and halothane, nor by oxygen or nitrous oxide. The response time of the sensor depends on its position within the gas, and in the most favourable case is about 3 minutes. The sensor is readily incorporated within an existing gas circuit. The linearity of the characteristic curve must be corrected by external electronic compensation to avoid measuring problems in the lower humidity range.
authors.affiliation: Abteilung Anästhesie III, Medizinische Hochschule Hannover.
authors.forename: J M
authors.initials: JM
authors.lastname: Strauss
authors.forename: S
authors.initials: S
authors.lastname: Krohn
authors.forename: V
authors.initials: V
authors.lastname: Klundt
mesh_terms: D000770:Anesthesia, Endotracheal / Q000295:instrumentation*; D004867:Equipment Design; D006221:Halothane; D006801:Humans; D006813:Humidity; D007530:Isoflurane; D009609:Nitrous Oxide; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation*; D012016:Reference Values
chemical_list: D007530:Isoflurane; D009609:Nitrous Oxide; D006221:Halothane
vernacular_title: Eignung kapazitiver Sensoren für die Messung der relativen Feuchte in Narkosekreissystemen.