Gas sensor calibration system

Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer

Reexamination Certificate

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Reexamination Certificate

active

07146841

ABSTRACT:
An apparatus is described for calibrating at least one sensor within a gas detector (22), which detector has a gas inlet in fluid communication with the or each sensor, the apparatus comprising a housing (10) that contains: a) a surface (24) for abutting against the detector (22); b) a holder (14) for holding the gas detector (22) with respect to the housing (10) in such a manner that a region of the detector containing the gas inlet abuts against the surface (24) of the housing to form a sealed gas interface between the surface (24) and the detector (22); c) a connector for connecting a source of pressurised calibration gas (12) to the apparatus, d) a conduit (32) for delivering a calibration gas from the connector (34) to the interface between the detector and the apparatus housing, e) electrical connections (40) within the holder for forming electrical connections between the apparatus and a detector held within the holder, and e) a flow controller (34, 36) within the conduit for providing calibration gas at a predetermined level to the interface, the flow controller including an electrically-operated valve (36) being controllable for initiating and terminating the flow of calibration gas through the conduit (32) by means of signals received from the detector via the electrical connections (40). The whole calibration is controlled by the detector and not the calibration apparatus.

REFERENCES:
patent: 4462244 (1984-07-01), Lee
patent: 4489590 (1984-12-01), Hadden
patent: 4854153 (1989-08-01), Miyagawa et al.
patent: 5239492 (1993-08-01), Hartwig et al.
patent: 5665894 (1997-09-01), Baker
patent: 2392727 (2004-03-01), None
patent: 01/86286 (2001-11-01), None
Patent Abstracts of Japan, Publication No. 61-000737, Jan. 6, 1986 (Shimadzu Corp)., “Automatic Calibration Gas Introduction Time Decision Mechanism for Continuous Analyzer”.

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