(19)
(11) EP 1 808 691 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
09.06.2010 Bulletin 2010/23

(43) Date of publication:
18.07.2007 Bulletin 2007/29

(21) Application number: 07105795.4

(22) Date of filing: 17.05.2004
(51) International Patent Classification (IPC): 
G01N 27/22(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

(30) Priority: 06.06.2003 US 456380

(62) Application number of the earlier application in accordance with Art. 76 EPC:
04752416.0 / 1631819

(71) Applicant: STERIS Corporation
Mentor, OH 44060 (US)

(72) Inventor:
  • Centanni, Michael
    Parma, OH 44130 (US)

(74) Representative: Reitstötter - Kinzebach 
Patentanwälte Sternwartstrasse 4
81679 München
81679 München (DE)

 
Remarks:
This application was filed on 05.04.2007 as a divisional application to the application mentioned under INID code 62.
 


(54) Method and apparatus for determining the concentration of a chemical in a gas mixture


(57) A method and apparatus for determining the concentration of chemicals in a gas mixture inside a chamber. A capacitor is exposed to the gas mixture, wherein the gas mixture comprises a dielectric material between the plates of the capacitor. Permittivity of the dielectric is affected by the relative concentrations of the chemical components, and thus a measurement of the capacitance is used to determine the concentration levels of multiple chemical components in the gas mixture.