Boots – shoes – and leggings
Patent
1990-10-11
1993-08-24
Black, Thomas G.
Boots, shoes, and leggings
364509, 364497, 73 1G, G06F 1546, G01N 3100
Patent
active
052394921
ABSTRACT:
Apparatus for calibrating the gas detector of a gas analyzer includes a gas source circuit for providing a standard sample gas at a substantially constant, predetermined pressure. The gas source circuit includes a gas bottle for containing the standard sample gas and a pressure regulator circuit for maintaining the output pressure of the gas source circuit to the substantially constant, predetermined pressure. Ideally, the gas source circuit is semipermanently coupled to the gas detector so that calibration may be performed at any time, even while the gas detector is coupled in an analysis circuit for analyzing an unidentified sample gas. The gas analyzer further includes a data processor that responds to programming instructions and data for controlling the gas source circuit and gas detector to perform the zero measurement and span measurement needed for calibration. The data processor is constructed to initiate a calibration operation upon the occurrence of a predetermined event such as, for example, elapse of a predetermined time interval.
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patent: 4494399 (1985-01-01), Youngman
patent: 4914720 (1990-04-01), Knodle et al.
patent: 4947339 (1990-08-01), Czekajewski et al.
patent: 4953075 (1990-08-01), Nau et al.
patent: 5013920 (1991-05-01), Asano et al.
patent: 5060505 (1991-10-01), Tury et al.
Habibi Hodjat
Hartwig Robert W.
Black Thomas G.
SpaceLabs Medical, Inc.
Zanelli Michael
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