J21K Series
8Pages

DIFFERENTIAL PRESSURE SWITCH 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)

overview The 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 • Designed to meet Enclosure Type 4X (with watertight conduit fitting) • UL listed and cUL certified • Optional ATEX and Rostechnadzor (GOST-R)...

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 ±1% of full scale range Set point repeats after 15 G, 10 millisecond duration Set point repeats after 2.5 G, 5-500 Hz 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...

approvals UNITED STATES AND CANADA UL listed, cUL certified UL 508; CSA C22.2, no. 14 File # E42272 Canadian Registration Number (CRN): Refer to www.ueonline.com/certifications for list of approved models EUROPE Low Voltage Directive (LVD) 73/23/EC & 93/68/EEC Compliant to LVD Products rated lower than 50 VAC and 75 VDC are outside the scope of the LVD Pressure Equipment Directive (PED) 97/23/EC Compliant to PED Products rated lower than 7.5 psi are outside the scope of the PED ATEX Directive (94/9/EC) II 1G Ex ia IIC T6 Ga (Optional - code M405) -50°C ≤ Tamb ≤ +60°C UL International DEMKO...

model chart Model Adjustable Set Point Range Low end of range on fall; High end of range on rise psid bar (unless noted) Differential Proof Pressure** Working Pressure* 13,5 to 20,3 mbar 6,9 to 27,6 mbar 20,7 to 48,3 mbar 6,9 to 41,4 mbar psi bar (unless noted) (unless noted) Welded 316L stainless steel bellows with 1/2” NPT (female) pressure connections S127B S140B S150B 16021 13,5 to 20,3 mbar 6,9 to 27,6 mbar 20,7 to 48,3 mbar 6,9 to 41,4 mbar 316L welded stainless steel bellows with 1/4" NPT (female) pressure connections 357 Brass bellows with 1/4” NPT (female) pressure connections 127...

how to order Building a part number Refer to the “Type” section below Refer to the “Model Charts” Refer to the “Options” section Determine type number based on switch output, enclosure, adjustment and reference. Determine model based on adjustable range, deadband and proof pressure. Determine option number based on switch output, optional materials or other product enhancements. Fill in the type portion of your part number with the corresponding number. Fill in the model portion of your part number with the corresponding number. Fill in the option portion of your part number with the...

dimensional drawings Dimensional drawings for all models may be found at www.ueonline.com Internal Set Point Adjustment All dimensions stated in inches (millimeters) Pressure Sensors Model 127-16020

RECOMMENDED PRACTICES AND WARNINGS United Electric Controls Company recommends careful consideration of the following factors when specifying and installing UE pressure and temperature units. Before installing a unit, the Installation and Maintenance instructions provided with unit must be read and understood. • To avoid damaging unit, proof pressure and maximum temperature limits stated in literature and on nameplates must never be exceeded, even by surges in the system. Operation of the unit up to maximum pressure or temperature is acceptable on a limited basis (e.g., start-up, testing)...