The J21K Series is a differential pressure switch featuring sealed metal bellows sensors and a gasketed die-cast aluminum enclosure with epoxy coating, designed for monitoring pressure differentials in applications such as refrigeration, compressors, and filter status verification. It has a single SPDT snap-action switch with a 15 A resistive electrical rating at 125/250/480 VAC, adjustable ranges from 30" Hg vacuum to 90 psid (-1 to 6 bar), and meets NEMA Type 4X enclosure requirements. Pressure connections are 1/4" or 1/2" NPT female depending on model. The device operates from -40 to 160°F (-40 to 71°C), maintains set point repeatability within ±1% of full scale, and is UL listed and cUL certified. Optional ATEX and GOST-R intrinsic safety compliance is available. Weight is approximately 2 lbs (0.90 kg), with a 7/8" diameter conduit entry.
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.
| United Electric Controls Company | |
|---|---|
| Product Category | Pressure Switches |
| Product Number | J21K Series |
| Product Name | Differrential Pressure Switch |
| Sensor Technology | Mechanical Deflection |
| Pressure Measurement | Differential; Vacuum |
| Material | Gas |
| Vacuum Range | -2 to 5414 torr (30 to -183 in Hg vac) |
| Signal Output | Switch |
