UE 120 Series SIL-Certified Switches Model Selection Guide
Use this table to find the right model for your application. Looking for other ranges, wetted materials or connection sizes? Don't see the option you need? Call a Lesman sales specialist at 800-953-7626.
| Sensor | Pressure Connection |
Adjustable Setpoint Range |
Deadband | Proof Pressure |
Click for Price and Availability |
||
|---|---|---|---|---|---|---|---|
| Material | Size | 1 SPDT | 2 SPDT | ||||
| UE H121K/H122K Differential Pressure Switches, Single Electrical Conduit, External Adjustment with Reference Dial | |||||||
| Brass Bellows | Nickel-Plated Brass |
1/4" NPTF | 3 to 30 PSID 10 to 100 PSID |
0.3 to 2 PSI 0.5 to 3 PSI |
180 PSI | H121K-147 H121K-157 |
H122K-147 H122K-157 |
| Buna-N Diaphragm and O-Ring |
Aluminum | 1/4" NPTF | 2 to 20 PSID 3 to 30 PSID |
0.1 to 0.3 PSI 0.1 to 0.4 PSI |
225 PSI | H121K-456 H121K-457 |
H122K-456 H122K-457 |
| Welded 316L Stainless Steel Bellows |
316L SS | 1/2" NPTF | 3 to 30 PSID 10 to 100 PSID |
0.3 to 2 PSI 0.5 to 3 PSI |
300 PSI | H121K-S147B H121K-S157B |
H122K-S147B H122K-S157B |
| UE J120K Differential Pressure Switches, Dual Electrical Conduits, Internal Adjustment, No Reference Dial | |||||||
| Buna-N Diaphragm and Sealing Diaphragms |
Aluminum | 1/8" NPTF | 0.2" to 7" WCD 1" to 20" WCD 5" to 50" WCD 10" to 200" WCD |
0.05" to 0.6" WC 0.1" to 1.0" WC 0.2" to 2.5" WC 0.5" to 8" WC |
400 PSI | J120K-540 J120K-541 J120K-542 J120K-543 |
N/A |
| Buna-N Diaphragm and Sealing Diaphragms |
Aluminum | 1/8" NPTF | 2 to 20 PSID 5 to 50 PSID 10 to 125 PSID 50 to 250 PSID 100 to 500 PSID |
0.1 to 1.3 PSI 0.2 to 2.2 PSI 0.4 to 5.0 PSI 0.8 to 10 PSI 2.0 to 15 PSI |
2500 PSI | J120K-544 J120K-545 J120K-546 J120K-547 J120K-548 |
N/A |
| Buna-N Diaphragm and O-Ring |
Aluminum | 1/4" NPTF | 5" to 80" WCD 2 to 20 PSID 3 to 30 PSID |
1" to 4" WC 0.1 to 0.3 PSI 0.1 to 0.4 PSI |
225 PSI | J120K-455 J120K-456 J120K-457 |
N/A |
| Welded 316L Stainless Steel Bellows |
316L SS | 1/2" NPTF | 3 to 30 PSID 10 to 100 PSID |
0.3 to 1.5 PSI 0.5 to 2 PSI |
300 PSI | J120K-S147B J120K-S157B |
N/A |
| Welded Brass Bellows |
Nickel-Plated Brass |
1/4" NPTF | 3 to 30 PSID 10 to 100 PSID |
0.3 to 1.5 PSI 0.5 to 2 PSI |
180 PSI | J120K-147 J120K-157 |
N/A |
| Buna-N Diaphragm and O-Ring |
316 SS | 1/4" NPTF | 3 to 30 PSID 10 to 100 PSID |
1 to 5 PSI 2 to 8 PSI |
1000 PSI | J120K-36 J120K-37 |
N/A |
| Buna-N Diaphragm and O-Ring |
316 SS | 1/4" NPTF | 30 to 300 PSID 50 to 500 PSID |
2 to 15 PSI 3 to 20 PSI |
2500 PSI | J120K-38 J120K-39 |
N/A |
| Teflon, Buna-N Diaphragms, Buna-N O-Ring |
Aluminum | 1/4" NPTF | 10 to 100 PSID | 0.2 to 1 PSI | 225 PSI | J120K-559 | N/A |
| Welded 316L Stainless Steel Bellows |
316L SS | 1/4" NPTF | 10 to 100 PSID | 4 to 10 PSI | 500 PSI | J120K-367 | N/A |
| Sensor Type and Material |
Pressure Connection | Adjustable Setpoint Range |
Deadband | Proof Pressure |
Click for Price and Availability |
||
|---|---|---|---|---|---|---|---|
| Material | Size | 1 SPDT | 2 SPDT | ||||
| J120 Pressure Switch, Dual Electrical Conduits, Internal Adjustment, No Reference Dial, 0.72" Orifice for Clean-Out Purposes (* NACE MR0175 Compliant with Option M401) | |||||||
| Buna-N Diaphragm and O-Ring |
Aluminum | 1/2" NPTF | 300" Vac to 0" WC 10" Vac to 0" WC 50" Vac to 50" WC 0.5" to 5" WC 2.5" to 50" WC 10" to 250" WC |
0.2" to 8" WC 0.1" to 0.6" WC 0.1" to 3" WC 0.1" to 0.3" WC 0.1" to 0.8" WC 0.1" to 6" WC |
100 PSI | J120-520 J120-521 J120-522 J120-523 J120-524 J120-525 |
N/A |
| Welded 316L Stainless Steel Diaphragm |
316L SS | 1/2" NPTF | 300" Vac to 0" WC 10" Vac to 0" WC 50" Vac to 50" WC 0.5" to 5" WC 2.5" to 50" WC 10" to 250" WC |
0.2" to 15" WC 0.1" to 0.6" WC 0.1" to 3" WC 0.1" to 0.3" WC 0.1" to 0.8" WC 0.1" to 10" WC |
100 PSI | J120-530 J120-531 J120-532 J120-533 J120-534 J120-535 |
N/A |
| Welded 316L Stainless Steel Diaphragm |
316L SS | 1/2" NPTF | 1 to 20 PSI 2 to 50 PSI 4 to 100 PSI 8 to 200 PSI |
0.1 to 1 PSI 0.1 to 1.5 PSI 0.1 to 2.5 PSI 0.1 to 3.5 PSI |
1000 PSI | J120-171 * J120-172 * J120-173 * J120-174* |
N/A |
| Welded 316L Stainless Steel Diaphragm |
316L SS | 1/2" NPTF | 5 to 30 PSI 10 to 100 PSI 15 to 300 PSI 20 to 500 PSI 80 to 1700 PSI |
1 to 3 PSI 1 to 8 PSI 3 to 18 PSI 4 to 30 PSI 5 to 120 PSI |
2500 PSI | J120-190 * J120-191 * J120-192 * J120-193 * J120-194 * |
N/A |
| J120 Pressure Switch, Dual Electrical Conduits, Internal Adjustment, No Reference Dial (+ Have Zinc-Plated Steel Spring Exposed to Media) | |||||||
| Brass Bellows | Nickel-Plated Brass |
1/4" NPTF | 30" to 3" HgVac 30" HgVac to 20 PSI 15" to 80" WC 0.5 to 20 PSI 1 to 50 PSI 2 to 100 PSI 4 to 200 PSI |
0.2" to 0.6" Hg 0.2" to 0.6" Hg 2" to 6" WC 0.1 to 0.3 PSI 0.1 to 0.5 PSI 0.2 to 0.6 PSI 0.2 to 1 PSI |
5 PSI 25 PSI 5 PSI 25 PSI 75 PSI 125 PSI 200 PSI |
J120-126 + J120-134 + J120-137 J120-144 J120-156 J120-156 J120-164 |
N/A |
| Welded 316L Stainless Steel Bellows |
316L SS | 1/2" NPTF | 30" to 3" HgVac 30" HgVac to 20 PSI 15" to 80" WC 0.5 to 20 PSI 1 to 50 PSI 2 to 100 PSI |
0.2" to 0.6" Hg 0.2" to 0.6" Hg 2" to 6" WC 0.1 to 0.3 PSI 0.1 to 0.5 PSI 0.2 to 0.6 PSI |
5 PSI 25 PSI 5 PSI 25 PSI 75 PSI 125 PSI |
J120-S126B J120-S134B J120-S137B J120-S144B J120-S152B J120-S156B |
N/A |
| Teflon Diaphragm Viton O-Ring |
316 SS | 1/4" NPTF | 30" to 3" HgVac 2" to 80" WC 30" HgVac to 20 PSI 0.5 to 20 PSI 0.8 to 30 PSI 2 to 100 PSI |
0.1" to 0.4" Hg 1" to 4" WC 0.2" to 0.5" Hg 0.1 to 0.2 PSI 0.1 to 0.3 PSI 0.2 to 0.4 PSI |
225 PSI | J120-550 J120-551 J120-552 J120-553 J120-554 J120-555 |
N/A |
| Phosphor Bronze Bellows | Nickel-Plated Brass |
1/4" NPTF | 4 to 200 PSI 6 to 300 PSI |
1 to 4 PSI 1 to 5 PSI |
250 PSI 350 PSI |
J120-270 J120-274 |
N/A |
| Welded 316L Stainless Steel Bellows |
316L SS | 1/4" NPTF | 15 to 100 PSI 15 to 200 PSI 20 to 300 PSI 25 to 500 PSI |
0.7 to 1.8 PSI 1 to 6 PSI 1 to 7 PSI 1.5 to 8 PSI |
800 PSI | J120-356 J120-358 J120-361 J120-376 |
N/A |
| Buna-N Diaphragm and O-Ring |
Nickel-Plated Brass |
1/4" NPTF | 1.5 to 30 PSI 3 to 100 PSI 9 to 300 PSI |
1 to 2 PSI 1 to 5 PSI 1 to 7 PSI |
1000 PSI | J120-701 J120-702 J120-703 |
N/A |
| Buna-N Diaphragm and O-Ring |
Nickel-Plated Brass |
1/4" NPTF | 15 to 500 PSI 30 to 1000 PSI |
2 to 11 PSI 3 to 22 PSI |
2500 PSI | J120-704 J120-705 |
N/A |
| J120 Pressure Switch, Dual Electrical Conduits, Internal Adjustment, No Reference Dial (Not Recommended for Rapid or High Cycling Pressure Changes) | |||||||
| 316 Stainless Steel Bellows | 316 SS | 1/4" NPTF | 100 to 1700 PSI | 9 to 40 PSI | 2500 PSI | J120-680 | N/A |
| H121/122 Pressure Switch, Single Electrical Conduit, External Adjustment with Reference Dial (+ Have Zinc-Plated Steel Spring Exposed to Media) | |||||||
| Brass Bellows | Nickel-Plated Brass |
1/4" NPTF | 30" HgVac to 0 PSI 30" HgVac to 20 PSI 2" to 80" WC 0 to 20 PSI 0 to 30 PSI 0 to 100 PSI 0 to 200 PSI |
0.2" to 0.9" Hg 0.2" to 1.2" Hg 2" to 10" WC 0.1 to 0.5 PSI 0.1 to 0.6 PSI 0.2 to 0.8 PSI 0.3 to 2 PSI |
5 PSI 25 PSI 5 PSI 25 PSI 40 PSI 125 PSI 200 PSI |
H121-126 H121-134 H121-137 H121-144 H121-146 H121-156 H121-164 |
H122-126 H122-134 – H122-144 H122-146 H122-156 H122-164 |
| Welded 316L Stainless Steel Bellows |
316L SS | 1/2" NPTF | 30" HgVac to 0 PSI 30" HgVac to 20 PSI 2" to 80" WC 0 to 20 PSI 0 to 30 PSI 0 to 100 PSI 0 to 200 PSI |
0.2" to 0.9" Hg 0.2" to 1.2" Hg 2" to 10" WC 0.1 to 0.5 PSI 0.1 to 0.6 PSI 0.2 to 0.8 PSI 0.3 to 2 PSI |
5 PSI 25 PSI 5 PSI 25 PSI 40 PSI 125 PSI 200 PSI |
H121-S126B H121-S134B H121-S137B H121-S144B H121-S146B H121-S156B H121-S164B |
H122-S126B H122-S134B – H122-S144B H122-S146B H122-S156B H122-S164B |
| Teflon Diaphragm Viton O-Ring |
316 SS | 1/4" NPTF | 30" HgVac to 0 PSI 30" HgVac to 20 PSI 0 to 20 PSI 0 to 30 PSI 0 to 100 PSI |
0.1" to 0.6" Hg 0.2" to 1" Hg 0.05 to 0.3 PSI 0.1 to 0.4 PSI 0.25 to 0.75 PSI |
225 PSI | H121-550 H121-552 H121-553 H121-554 H121-555 |
H122-550 H122-552 H122-553 H122-554 H122-555 |
| 316L Stainless Steel Bellows |
316L SS | 1/4" NPTF | 0 to 200 PSI 0 to 300 PSI 0 to 500 PSI |
1.5 to 8 PSI 2 to 9 PSI 3 to 12 PSI |
250 PSI 350 PSI 575 PSI |
H121-358 H121-361 H121-376 |
H122-358 H122-361 H122-376 |
| H121/122 Pressure Switch, Single Electrical Conduit, External Adjustment with Reference Dial. Not recommended for gas service as drying of the O-ring seal can allow bleeding of the medium into the atmosphere. | |||||||
| 303 Stainless Steel Piston Buna-N O-Ring |
303 SS | 1/4" NPTF | 200 to 3000 PSI 500 to 6000 PSI |
40 to 250 PSI 50 to 600 PSI |
10000 PSI | H121-612 H121-614 |
H122-612 H122-614 |
| Adjustment | Reference Dial |
Bulb OD x Stem Length |
Adjustable Range | Max Temperature | Scale Division | Click for Price and Availability |
||||
|---|---|---|---|---|---|---|---|---|---|---|
| °F | °C | °F | °C | °F | °C | 1 SPDT | 2 SPDT | |||
| F120 Temperature Switch: 304 Stainless Steel Bulb with 6-Foot Capillary, Dual Electrical Conduits | ||||||||||
| Internal | No | 3/8" OD x 2-7/16" 3/8" OD x 2-1/8" 3/8" OD x 6-3/4" 3/8" OD x 5" 3/8" OD x 4-1/2" 3/8" OD x 3" 3/8" OD x 3-1/4" |
-125° to 350° -125° to 500° -40° to 120° -40° to 180° 0° to 250° 0° to 400° 50° to 650° |
-87.2° to 176.7° -87.2° to 260° -40° to 48.9° -40° to 82.2° -17.8° to 121.1° -17.8°° to 204.4° 10° to 343.3° |
400° 550° 170° 230° 300° 450° 700° |
204.4° 287.8° 76.7° 110° 148.9° 232.2° 371.1° |
N/A | N/A | F120-2BS F120-3BS F120-4BS F120-5BS F120-6BS F120-7BS F120-8BS |
N/A |
| E121/E122 Temperature Switches: 304 Stainless Steel Bulb with 6-Foot Capillary, Single Electrical Conduit (* Heat Tracing Switch with 10-Foot Capillary Standard) | ||||||||||
| External | Yes | 3/8" OD x 2-5/8" 3/8" OD x 2-5/8" 3/8" OD x 2-1/8" 3/8" OD x 6-3/4" 3/8" OD x 5" 3/8" OD x 3-1/4" 1/4" OD x 9-1/2 |
-120° to 100° 30° to 250° 100° to 400° 25° to 100° -20° to 80° 350° to 640° 25° to 325° |
-84.4° to 37.8° -1.1° to 121.1° 37.8° to 204.4° -3.9° to 37.8° -28.9° to 26.7° 176.7° to 337.8° -3.9° to 162.8° |
150° 300° 450° 150° 130° 690° 360° |
65.6° 148.9° 232.2° 65.6° 54.4° 365.6° 182.2 |
5° 5° 5° 2° 2° 5° 5° |
5° 5° 5° 1° 2° 5° 5° |
E121-2BSA E121-2BSB E121-3BS E121-4BS E121-5BS E121-8BS E121-13273 * |
E122-2BSA E122-2BSB E122-3BS E122-4BS E122-5BS E122-8BS E122-13321 * |
| Adjustment | Reference Dial |
Stem OD x
Length Below 1/2" Thread |
Adjustable Range | Max Temperature | Scale Division | Click for Price and Availability |
||||
| °F | °C | °F | °C | °F | °C | 1 SPDT | 2 SPDT | |||
| B121/B122 Temperature Switches: Nickel-Plated Brass Immersion Stem, Single Electrical Conduit (* Heat Tracing Switches with Stainless Steel Immersion Stem) | ||||||||||
| External | Yes | 9/16" OD x 1-7/8" BT 9/16" OD x 1-7/8" BT 9/16" OD x 2-11/16" BT |
0° to 225° 200° to 425° 15° to 140° |
-17.8° to 107.2° 93.3° to 218.3° -9.4° to 60° |
275° 475° 160° |
135° 246.1° 71.1° |
5° 5° 2° |
5° 5° 2° |
B121-120 B121-121 B121-13272 * |
B122-120 B122-121 B122-13322 * |
| C120 Temperature Switch: Nickel-Plated Brass Immersion Stem, Dual Electrical Conduits | ||||||||||
| Internal | No | 9/16" OD x 1-7/8" BT 9/16" OD x 1-7/8" BT |
0° to 225° 200° to 425° |
-17.8° to 107.2° 93.3° to 218.3° |
275° 475° |
135° 246.1° |
N/A | N/A | C120-120 C120-121 |
N/A |