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

By Tiera Oliver

Associate Editor

Embedded Computing Design

July 12, 2021


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

Sigma-Netics, a global manufacturer of pressure switches, pressure transducers, metal bellows and metal bellows assemblies, announced 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 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 suitable 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

For more information, visit:

Tiera Oliver, Associate Editor for Embedded Computing Design, is responsible for web content edits, product news, and constructing stories. She also assists with newsletter updates as well as contributing and editing content for ECD podcasts and the ECD YouTube channel. Before working at ECD, Tiera graduated from Northern Arizona University where she received her B.S. in journalism and political science and worked as a news reporter for the university’s student led newspaper, The Lumberjack.

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