The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1989
Filed:
Feb. 20, 1987
Henry L Williams, Oklahoma City, OK (US);
Geolograph Pioneer, Inc., Oklahoma City, OK (US);
Abstract
A purge control system providing a non-hazardous environment within an electronics enclosure comprises a purge air box housing non-electrical components having fluid communication lines between them. An outlet supplies inert gas under pressure from a supply to the enclosure and an inlet receives inert gas under pressure from the enclosure. A pressure regulator mounted in the box in fluid communication with the supply provides the air to a manifold distributing air to a flow meter providing flow of air to the enclosure through the outlet and determining rate of flow to the outlet; a signal valve having one inlet communicating with the manifold and another inlet communicating with the inlet; the signal valve having an outlet providing a pneumatic signal when pressure is received at the inlet; a first pneumatic light on the box connected to the outlet of the signal valve indicates the status of air coming from the enclosure; a time-delay pneuamtic relay connected to the outlet of the signal valve providing a delayed signal responsive to the signal received by the signal valve; an explosion-proof, pneumatically operated switch connected to the output of the time-delay relay providing electrical power to the enclosure responsive to the delayed signal; a second pneumatic light on the box responsive to the delayed signal indicating the status of electrical power. The system includes a two-way valve actuating an alarm when pressure from the enclosure falls below a predetermined value.