Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer
Reexamination Certificate
2005-07-19
2005-07-19
Noland, Thomas P. (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Gas or liquid analyzer
C073S001030, C073S001050
Reexamination Certificate
active
06918281
ABSTRACT:
The present invention provides a method of calibrating sensors within a gas detector (36) having a housing containing a gas inlet whereby gas can diffuse from the inlet to the sensors. The gas inlet in the housing is held against part (34) of the calibration apparatus to form a sealed gas interface between the apparatus and the detector; a source (10) of pressurized calibration gas is connected to the apparatus, and a predetermined dose of calibration gas is delivered to the interface between the detector (36) and the calibration apparatus (34) at a predetermined pressure. The source (10) of pressurized calibration gas may contain single or multiple calibration doses and, if the former, the calibration apparatus includes a dosing system such as cylinder (14) for metering individual doses of calibration gas.
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Downs Charles Edward
Ford Tom
Smith David
Sussman Michael
Andrus Sceales Starke & Sawall LLP
Noland Thomas P.
Zellweger Analytics Limited
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