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J21K Series Type J21K Models 127 to 16020 Differential Pressure Switch
Brand: United Electric Controls LtdThe J21K differential pressure switch monitors the difference between two system pressures or vacuums and senses excessive flow deviation, or verifies that a filter is clogged.
The J21K's rugged design - with epoxy coated enclosure and sealed metal bellows - lends itself to exacting applications. Widely used in refrigeration (chiller) and compressor applications, the J21K can be used for filter status monitoring and proof of flow.
Features- 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)
- Designed to meet enclosure Type 4X (with watertight conduit fitting)
- UL listed and cUL certified
- Optional ATEX and Rostechnadzor
- (GOST-R) intrinsic safety compliance
- Optional adjustable deadband
- Single switch output
- Opposing bellows design
Specifications
Ambient Temperature Range
- -40° to 71° C (-40° to 160° F), Set Point Typically Shifts less than 1 % of Range for a 28° C (50° F) Ambient Temperature Change
Applications
- Refrigeration (Chiller) & Compressor
Approvals & Certifications
- ATEX Ex directive (94/9/EC) II 1 G EEx ia IIC T6, Tamb: -50° to 60° C (-58° to 140° F)
- CE
- GOST R 51330.0, 51330.1, 51330.10 & 51330.14
- Low Voltage Directive (LVD) 73/23/EC & 93/68/EEC
- PED: 97/23/EC
- UL (C,US)
Approvals & Certifications
- ISO 9001
Deadband
- Inches Hg: 0.4 to 0.6 (kPa: 1.35 to 2.03, bar: 13.5 to 20.3)
- psi: 0.1 to 0.7 (kPa: 0.69 to 4.83, Mbar: 6.9 to 48.3)
Electrical Connectors
- 7/8” Diameter Conduit Hole
Electrical Contacts
- Normally Closed
- Normally Open
Electrical Rating
- 1 A at 125 Vac Resistive
- 15 A at 125/250/277 Vac Resistive
- 15 A at 125/250/480 Vac Resistive
- 5 A at 125/250 Vac Resistive
Enclosure Finish
- Epoxy Powder-Coated
Enclosure, Body Material
- Gasketed Die Cast Aluminum
Environmental Protection
- IP66
- NEMA 4X: Watertight Conduit Fitting, Converts 7/8” Hole to 1/2” NPT Fitting
NPT Connection
- 1/4” NPT Female
Operating Pressure
- psi: -14.7 to 180 (kPa: -101.4 to 1,241, bar: -1 to 12.4)
Process Connection Material
- Brass Bellows with 1/4” NPT (Female) Pressure Connection
Proof Pressure
- Differential Proof Pressure: psi: 6 to 125 (kPa: 41.37 to 861.8, bar: 0.41 to 8.62)
Repeatability
- ± 1 % of Full Scale Range
Set Point - Decreasing
- bar: -1 to 1
- kPa: -101.4 to 103.4
- psi: -14.7 to 15
Set Point - Increasing
- bar: -1 to 1
- kPa: -101.4 to 103.4
- psi: -14.7 to 15
Shock
- Set Point Repeats after 15 G, 10 millisecond Duration
Storage Temperature
- -54° to 71° C (-65° to 160° F)
Switch Type
- One SPDT Snap-Action Switch
System Pressure
- bar: 12.4
- kPa: 1,241
- psi: 180
Vibration
- Set Point Repeats after 2.5 G, 5 to 500 Hz
