Patent ID: 6734800
Filing Date: 2004-05-11
Classification: G01L

Abstract:
An atmospheric low pressure alarm system comprising:a breadbox casing; a face plate fixedly mounted to the breadbox casing; a barometric scale printed to the face plate; a rotatable shaft extending through the face plate; a conductive scale pointer affixed to the rotatable shaft for a sweeping movement over the face plate; a means for the scale pointer to rotate about in a counter-clockwise direction as the atmospheric pressure decreases and in a clockwise direction as the atmospheric pressure rises; a first insulated pushbutton contact switch mounted to the barometric face plate and representing a first selectable alarm threshold position; a second insulated pushbutton contact switch mounted to the barometric face plate below the first pushbutton switch and representing a second selectable alarm threshold position; said first and second pushbutton contact switches each acting as a sensor when not being pushed down to a recessed position, which upon contact with the conductive scale pointer complete an electrical circuit to activate an alarm.