UE J21K Series Differential Pressure Switches

Prices starting at:
$290.00
In stock
SKU
J21K

Differential pressure switches for general purpose use. Single SPDT switch output, internal adjustment, NEMA 4X enclosure, isolated metal bellows sensors. UL listed, cUL certified, CE compliant.

UE's J21K differential pressure switch is designed to monitor the difference between two system pressures or vacuums, sense excessive flow deviation, or verify that a filter is clogged. Commonly used in chiller and compressor applications, the J21K can be used for filter status monitoring and proof of flow.

  • Single SPDT switch output
  • Sealed brass, phosphor bronze or welded stainless steel bellows sensors
  • Adjustable differential pressure ranges from 30" HgVac to 90 PSID
  • Internal adjustment
  • Setpoint repeatability: ±1% adjustable range
  • NEMA 4X gasketed diecast aluminum enclosure with epoxy coating
  • UL listed, cUL certified
  • Popular models and ranges normally available from Lesman stock, ready to ship within one business day

Model Selection Guide

Use this table to find the right model for your application. Don't see the option you need? Call a Lesman sales specialist at 800-953-7626.

Sensor
Type
Sensor
Material
Pressure
Connection
Connection
Material
Adjustable Setpoint Range
(PSID Unless Noted)
Working Pressure
(PSI Unless Noted)
Deadband
(PSI Unless Noted)
Differential Proof
Pressure (PSI)
Catalog
Number
J21K differential pressure switch with sealed metal bellows sensor, single SPDT output, NEMA 4X diecast aluminum enclosure, 7/8" diameter conduit hole electrical connection. Internal adjustment, no reference dial.
Bellows Brass 1/4" NPTF Nickel-Plated
Brass
30" HgVac to 0 PSI
0 to 6
0 to 40
1 to 15
30" HgVac to 0
30" HgVac to 30
30" HgVac to 180
30" HgVac to 125
0.4" to 0.6" Hg
0.1 to 0.4
0.3 to 0.7
0.1 to 0.6
15
6
40
125
J21K-127
J21K-140
J21K-150
J21K-16020
Bellows Welded 316L
Stainless Steel
1/2" NPTF Welded 316L
Stainless Steel
30" HgVac to 0 PSI
0 to 6
0 to 40
1 to 15
30" HgVac to 0
30" HgVac to 30
30" HgVac to 180
30" HgVac to 125
0.4" to 0.6" Hg
0.1 to 0.4
0.3 to 0.7
0.1 to 0.6
15
6
40
125
J21K-S127B
J21K-S140B
J21K-S150B
J21K-16021
Bellows Phosphor Bronze 1/4" NPTF Brass 0 to 25
0 to 90
30" HgVac to 110
30" HgVac to 200
0.6 to 1
2 to 4
25
90
J21K-232
J21K-234
Bellows Welded 316L SS 1/4" NPTF Welded 316L SS 0 to 70 30" HgVac to 350 2 to 4 70 J21K-357
More Information
SIL-Rated No
Measured Variable Differential Pressure
Enclosure/Construction NEMA 1, NEMA 4X
Switch Output SPDT
Sensor Type Bellows
Adjustment Internal Adjustment
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