Dwyer 1950G-20-B-24-NA is an explosion-proof differential pressure switch with a temperature range of 0 to 140°F (-17 to 60°C). It operates on a power requirement of 24 VDC ±10% or 120/240 VAC ±10% (optional). The enclosure is rated as NEMA 3 (IP54), NEMA 7, and 9. It has internal terminal block electrical connections and is suitable for use with air and compatible combustible gases. The switch must be mounted with the diaphragm in a vertical position, but other positions can be requested. Wetted material should be consulted with the factory. The pressure limit is 45" w.c. (11.2 kPa) continuous and 10 psig (68.95 kPa) surge. The process connection is 1/8" female NPT. It has an electrical rating of 10 A, 120/240 VAC, 28 VDC, and a 1 Form C relay (SPDT) switch type. The set point adjustment is a screw type located on top of the housing.