IPP&T Magazine Online

UL-rated pressure switches for explosive environments

July 13, 2021   Don Horne


The 703-U and 703-UJ Series have a corrosion-resistant stainless steel construction and UL ratings for hazardous locations, including Class 1: Division 1, Groups A, B, C, D, as well as Class 2: Groups E, F, G.

Units also feature high overpressure capabilities, a NEMA Type 7 explosion-proof rating and rugged piston design, enabling these switches to withstand high pressure spikes, shock and vibration.

The 703-U Series features factory-set fixed pressure, while the 703-UJ features field-adjustable pressure.

Designed for easy field adjustment, the 703-UJ also incorporates a tamper-resistant locking mechanism to maintain set point integrity. Additional features and specifications of the 703-U/UJ Series include:

-Pressure range: 6 to 5,000 PSI

-Temperature range: -40 to +180°F

-Pressure connection: 1/4″–18 NPT (male) and 1/2″–14 NPT (male)

-Single pole double throw (SPDT) option

-Double pole double throw (DPDT) option

-1/2-inch NPT electrical connection with five full threads for conduit engagement

-Factory-sealed lead wires — Type UL 1015 AWG #18, 24 inches long

-Hydraulic and electric modules AISI 316 stainless steel

Thanks to their durable construction, 703-U/UJ pressure switches boast exceptional accuracy and repeatability even in explosive environments. They also guarantee a long service life, thanks to a snap-action electrical switch tested to 1 million cycles.

www.sigmanetics.com


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