Gas detector
First Claim
1. An apparatus for detecting the presence of anaesthetic gases selected from the group consisting of halothane, enfluorance, metoxyfluorane and isofluorane in a mixture of gases, comprising a thin layer of a substrate coated on the surface of a carrier body in such manner that the gas mixture can be brought into contact with the substrate layer, and means for measuring a physical property of said substrate layer which is affected by the amount of gaseous components being adsorbed by the substrate layer, said substrate layer comprising a silicone glycol copolymer.
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Accused Products
Abstract
An apparatus for detecting and measuring the presence and the concentration, respectively, of halogenated hydrocarbons, in particular anaesthetic gases, as halothane, enfluorane, metoxyfluorane and isofluorane, in a mixture of gases comprises a piezoelectric crystal, which has its surface coated with a thin layer of a substrate and which is so arranged that the substrate layer can be brought into contact with the gas mixture. The crystal is coupled to an oscillator circuit which is connected to means for measuring changes in the oscillating frequency of the crystal and thus also of the oscillator circuit caused by adsorption by the substrate layer of the gas component to be detected. The substrate layer comprises a silicone oil having a structural formula comprising large branch chains or pendant blocks. Preferably a silicone oil is used comprising a silicone glycol copolymer.
86 Citations
7 Claims
- 1. An apparatus for detecting the presence of anaesthetic gases selected from the group consisting of halothane, enfluorance, metoxyfluorane and isofluorane in a mixture of gases, comprising a thin layer of a substrate coated on the surface of a carrier body in such manner that the gas mixture can be brought into contact with the substrate layer, and means for measuring a physical property of said substrate layer which is affected by the amount of gaseous components being adsorbed by the substrate layer, said substrate layer comprising a silicone glycol copolymer.
Specification