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Date 21/Apr/2018 at 10:32 PM - View: 2802
Air differential pressure switch senses a change in the (differential) pressure (either velocity pressure or pressure drop across a restriction) as the airflow changes. The (differential) pressure is applied to the two sides of a diaphragm in the control. The spring-loaded diaphragm moves and actuates the switch. The differential pressure switch can also be used to detect small positive gauge pressure by using only the high-pressure connection and leaving the low pressure port open. Or to detect a vacuum by using only the low pressure connection and leaving the high pressure port open to ambient pressure