UE J21K Series Differential Pressure Switches
Prices starting at:
Price
$343.00
Call for Availability
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) |
Click for Price and Availability |
|---|---|---|---|---|---|---|---|---|
| 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-254 |
| Bellows | Welded 316L SS | 1/4" NPTF | Welded 316L SS | 0 to 70 | 30" HgVac to 350 | 2 to 4 | 70 | J21K-357 |
| SIL-Rated | No |
|---|---|
| Measured Variable | Differential Pressure |
| Enclosure/Construction | NEMA 1, NEMA 4X |
| Switch Output | SPDT |
| Sensor Type | Bellows |
| Adjustment | Internal Adjustment |