Series DDP switches are general-purpose proving switches that provide dual switching action for HVAC and Energy Management applications. Many control and alarm functions are possible. The DDP monitors two pressure sources and senses the differential for actuation at two independent set points.

Two separate SPDT snap-acting switches are mounted on a common foot bracket.  Each switch assembly has a separate low-pressure sample connection. The common high pressure sample connection is located on the foot bracket between the two low pressure connections. Because the two snap switches are set independently, an adjustable “dead band” can be established for control circuits requiring both high and low actuation points. Differential pressures up to 12″wc can be measured. Enclosure covers can be provided for the snap switches.