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Sigma-Netics Announces UL-Rated Pressure Switches for Explosive Environments

August 5, 2021

Riverdale, NJ, August 5, 2021 – Sigma-Netics, a global manufacturer of pressure switches, pressure transducers, metal bellows and metal bellows assemblies, announces its 703-U and 703-UJ Series of UL-rated, explosion-proof pressure switches. These components are suitable for gaseous or liquid fluid systems in hazardous applications, including offshore exploration, petrochemical processing and oil and gas pipelines.

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.

To learn more, please visit our

703-U and 703-UJ product pages.


About Sigma-Netics, Inc.

Sigma-Netics is a privately held corporation founded in 1966, headquartered in a 30,000 square foot facility in Riverdale, NJ, USA with facilities in Yorktown, VA and Dongyang, China. We are a global manufacturer of pressure switches, pressure transducers, metal bellows and metal bellows assemblies that protect equipment, processes and personnel in harsh industrial and flight-critical aerospace applications. All of our products are manufactured with uncompromising quality produced from innovative designs and superior manufacturing techniques.

[email protected] | 973-616-6900

2 North Corporate Drive, Riverdale, NJ 07457 | Sigma-Netics, Inc. © 2021