The J21K Series is simple to install and operate for alarm, safety and emergency shutdown applications requiring a higher switch sensitivity. It monitors the difference between two system pressures or vacuum using sealed, opposing bellows sensors. As an electromechanical switch, it can safely operate independently of the control system and switch reliably when called upon, free from potential communication errors or cyber concerns.

Typical applications that utilize the J21K Series include proof of flow, filter monitoring, vacuum pumps, chillers, and compressors.

J21K Series Differential Pressure Switch Features

• Welded bellows sensor provides leak-free protection
• Precise on-off control through adjustable deadband option
• Application versatility achieved through a variety of ranges and microswitches
• Robust, NEMA 4X differential pressure switch
• Sealed metal bellows sensors
• Welded 316 stainless steel sensors
• Gasketed die-cast aluminum enclosure with epoxy coating
• Single switch output
• Adjustable Ranges: 30 "Hg Vac to 90 psid (-1 to 6 bar)

J21K Series Differential Pressure Switch Specifications

• Ambient Temperature Limits: -40 to 160°F (-40 to 71°C); Set point typically shifts less than 1% of range for a 50°F (28°C) ambient temperature change
• Set Point Repeatability: ±1% of full-scale range
• Shock: Set point repeats after 15 G, 10 millisecond duration
• Vibration: Set point repeats after 2.5 G, 5-500 Hz
• Enclosure: Die-cast aluminum, epoxy powder coated, gasketed
• Enclosure Classification: Designed to meet enclosure type 4X requirements with M900 option (watertight conduit fitting)
• Switch Output: One SPDT snap action switch; switch may be wired "normally open" or "normally closed"
• Electrical Rating: 15 A 125/250/480 VAC resistive. Electrical switches have limited DC capabilities. Consult factory for additional information.
• Weight: Approximately 2 lbs. (0.90 kg.)
• Electrical Connection: 7/8" diameter conduit hole
• Pressure Connection: Models 127-150, 232-254, 357, 16020: 1/4" NPT (female); models S127B-S150B, 16021: 1/2" NPT (female)

J21K Series Differential Pressure Switch Industries

• HVAC
• Power
• Oil & Gas

Download United Electric Controls J21K Series Differential Pressure Switch Datasheet

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