Orange Research”s Class 1, Div. 1-rated piston and diaphragm differential pressure sensors can be safely operated where flammable gases or vapors often exist because of their robust, sealed enclosures. The switches and electrical connectors in these units are housed in UL, CSA, FM, and ATEX-approved enclosures. The epoxy-coated, cast aluminum enclosures have two mounting lugs, two 3/4″ NPT electrical conduit ports, and meet Class 1, Gr. B, C, and D; Class 2, Gr. E, F, and G; and Class 3 specifications. They also meet NEMA 3, 4X, 7, 9, and 12 specifications. Explosion-proof differential pressure instruments are available in gauge, switch, and transmitter versions in pressure ranges from zero to five inches of water to zero to 300 PSID, and maximum line service is up to 5,000 PSIG. Optional field-adjustable reed switches control alarms and processes.