United Electric Controls J120-191 Pressure Switch 1500 Psi

Product Description

The UNITED ELECTRIC CONTROLS J120-191 is an explosion-proof pressure switch designed for use in hazardous-location applications where ignition risk from arcing contacts must be eliminated. The switch features a 1/2-inch NPTF threaded process connection and is rated to a maximum pressure setting of 1500 psi. Built to meet the demands of industrial and heavy-duty process environments, this unit is installed by licensed electricians, instrumentation technicians, or industrial mechanical contractors working in classified hazardous areas. The rugged housing contains any internal arc or spark, making it suitable for environments with flammable gases, vapors, or dusts.

This pressure switch is typically used in oil and gas, chemical processing, petrochemical, and heavy industrial facilities where pressure monitoring must occur in Class I or Class II hazardous locations. It connects directly to process piping or equipment via the 1/2-inch NPTF port and activates a switching action when the set pressure threshold is reached. Applications include compressor protection, pump control, and system high- or low-pressure cutout circuits in classified environments.

Key Features

• Explosion-proof enclosure rated for hazardous-location installation
• Maximum pressure setting of 1500 psi for high-pressure process applications
• 1/2-inch NPTF threaded connection for leak-resistant process piping interface
• Compact design suitable for direct process-line mounting
• Single-unit packaging with no minimum order multiple required beyond one unit

Compatibility

Designed as an OEM-style replacement or direct-install pressure switch for industrial process systems requiring explosion-proof switching at process connections up to 1500 psi with 1/2-inch NPTF porting.

Installation Notes

Installation must be performed by a qualified electrician or instrumentation technician familiar with NEC Article 500 requirements for hazardous locations. De-energize all associated circuits and depressurize the process line fully before removing or installing the switch. Use appropriate thread sealant rated for the process media on the NPTF connection, and verify torque practices consistent with the fitting material and line pressure rating. Do not exceed the maximum rated pressure setting during system commissioning or testing.