Air sampling and alarm control system
OwnerWilliam T. Fleming, Hill S. Lalininventors
Life of this patent
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Abstract
An air sampling and alarm control system for detecting the presence of a toxic contaminant in the atmosphere and for providing an audible alarm when insufficient gas flow is present in the system to adequately test for the presence of the contaminant. The alarm control is provided by a pressure switch which is electrically connected in circuit with an audible alarm and pneumatically connected in circuit with the gas flow line connecting the sampling pump to the sampling detector.
Claims6
An air sampling and alarm control system comprising a vacuum pump driven by a motor, with one end of said vacuum pump open to the atmosphere, air sample detection means connected to the opposite end of said vacuum pump for detecting the presence of a predetermined contaminant in a sample of said atmosphere drawn through said vacuum pump, a pressure switch pneumatically connected at one end thereof to a common connection between said vacuum pump and said sample detection means and said pressure switch being pneumatically open to the atmosphere at the opposite end thereof,
- with said pressure switch being connected electrically in circuit between a source of power and an audible alarm for actuating said alarm in response to a predetermined pressure change at said common connection between said vacuum pump and said sample detection means, and air flow damping means interposed between said pressure switch and said common connection for dampening pulsations in air flow caused by said motor drive.
Dependencies are inferred from the claim text.