Industrial JD-2 Air Pressure Switch Flow Switch

The Antunes Controls JD-2 Purple Spring air pressure switch (JD-2P) is a compact differential-pressure switch used to prove combustion air flow in boilers, burners, and other fuel-fired equipment. The purple-spring variant covers a 0.1 to 10 in WC pressure range and houses a snap-action electrical switch inside a rugged die-cast aluminum body, delivering reliable interlock safety in control sequences. The JD-2 family is color-coded by range (JD-2R red: 0.1–24 in WC; JD-2O orange: 0.1–4 in WC; JD-2G grey: 0.1–4 in WC; JD-2B blue: 0.07–1.7 in WC; JD-2P purple: 0.1–10 in WC), allowing selection by application without changing wiring. Designed for differential pressure, vacuum, or pressure sensing in air-flow applications, it is commonly used to prove burner air flow to prevent ignition or shutdown in the event of insufficient flow, and to interlock with flame safeguards or HVAC control panels. With a compact footprint and robust construction, the JD-2P is suitable for integration in industrial combustion safety systems where reliable airflow verification is critical.