Electric lamp and discharge devices: systems – Special application
Patent
1995-10-11
1996-11-26
Pascal, Robert
Electric lamp and discharge devices: systems
Special application
362 21, 362 22, 362267, 362158, 315362, H01K 700
Patent
active
055789056
ABSTRACT:
A portable electric lamp suitable for use in hazardous locations includes a fixture which is purged continuously with air during operation. Pressurized air is introduced at an input end of the fixture, through a plenum which establishes a generally laminar flow of air through the fixture during purging. To insure that the fixture is satisfactorily purged before power is applied to the lamps, differential pressure is measured over a precision orifice at the discharge end of the lamp, and total flow is determined. During the start-up cycle, pressure within the fixture must exceed a predetermined minimum threshold; but following start-up, the operating pressure may drop lower than the initial minimum pressure, as long as a positive pressure is maintained within the fixture.
REFERENCES:
patent: 4276580 (1981-06-01), Rogers
patent: 5519587 (1996-05-01), Baggio et al.
Pascal Robert
Shingleton Michael
Woodhead Industries Inc.
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