UE 120 Series SIL-Certified Switches for Hazardous Area or Harsh Environment Service

Prices starting at:
$315.00
In stock
SKU
120

Rugged pressure, differential pressure and temperature switches for Div 1 and Div 2 hazardous environments. Single SPDT or dual SPDT switch output, internal adjustment, or external adjustment with reference scale or dial, NEMA 4X enclosure, sensor materials to meet media and environmental requirements, UL, ATEX, NACE approved, CE compliant, SIL 2 Certified, SIL 3 capable

Meeting hazardous location requirements through adherence to UL, ATEX, and IECEx standards, United Electric's 120 Series is the choice where potentially explosive or highly corrosive atmospheres exist, specifically in the chemical, petrochemical, refinery, oil and gas production and transmission industries. The 120 Series offers pressure, differential pressure, vacuum and temperature ranges, as well as port connections, wetted materials and sensor types to meet any application need.

  • Pressure ranges from 30" HgVac to 6000 PSI, differential pressure ranges from 30" Hg to 1000 PSI, temperature ranges from -180° to 650°F
  • One or two SPDT outputs standard, optional DPDT or hermetic seal switch outputs available
  • Internal adjustment hex screw or external adjustment with reference dial
  • Easy-access terminal block to simplify wiring
  • NEMA 4X epoxy-coated cast aluminum enclosure
  • UL approvals for Class I, Divisions 1 and 2 environments, ATEX approved, CE compliant
  • EXIDA Certified for use in SIL 2 functional safety systems, (SIL 3 capable)
  • Popular models and ranges normally available from Lesman stock, ready to ship within a business day

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
Catalog
Number
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
Catalog Number
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 Catalog
Number
°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












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
E121-13321 *
Adjustment Reference
Dial
Stem OD x Length
Below 1/2" Thread
Adjustable Range Max Temperature Scale Division Catalog Number
°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°




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
More Information
SIL-Rated Yes
Measured Variable Differential Pressure, Gauge Pressure, Vacuum/Compound Pressure, Temperature
Enclosure/Construction NEMA 4X, Div 1 Hazardous, Div 2 Hazardous
Switch Output SPDT, Dual SPDT
Sensor Type Bellows, Diaphragm, Piston, Immersion Stem, Bulb and Capillary
Adjustment External Adjustment, Internal Adjustment, Reference Scale/Dial
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