Method and apparatus for measuring the concentration of a given

Details Method and apparatus for measuring the concentration of a given Method and apparatus for measuring the concentration of a given

1982-12-10

1985-04-09

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

73 1G, 128719, G01N 3100

Patent

active

045093598

ABSTRACT:
For the purpose of measuring the concentration of one or more given components of the breathing gas of a patient there is removed a small part of the breathing gas at a location immediately in front of the mouth of the patient. The withdrawn gas is passed to a measuring instrument sensitive to the component or components of interest through a line which comprises, at least in part, a thin tube of a fluorosulfonyl polymer, and the outer surface of which is in free contact with the ambient air. In this way, the temperature and relative humidity of the breathing gas supplied to the measuring instrument are brought into agreement with the temperature and relative humidity of the ambient air. By calibrating the measuring instrument with respect to the temperature and relative humidity of the surrounding air prior to carrying out the measuring operation, the measuring procedure can be carried out without disturbances caused by variations in the relative humidity and temperature of the breathing gas removed for measuring purposes.

REFERENCES:
patent: 3434471 (1969-03-01), Liston
patent: 3735559 (1973-05-01), Salemme
patent: 3895630 (1975-07-01), Bachman
D. E. Holness et al., "Temperature-Dependent Characteristics of Teflon Membranes Used in Mass Spec.", Med. Instr., vol. 8, No. 1, pp. 23-25, Jan.-Feb. 1975.

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