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United Electric (UE) 120 Series Explosion-Proof Temperature Switches

As safety requirements become more stringent, the determining factor in specifying an industrial pressure, differential pressure and temperature switch rests upon that switch protecting equipment, processes and personnel.

Meeting hazardous location requirements through adherence to UL, CSA, and ATEX standards, United Electric's 120 Series is the choice where potentially explosive or highly corrosive atmospheres exist. The 120 Series offers a variety of pressure, differential pressure, vacuum and temperature ranges, as well as port connections, wetted materials and sensor types.

Key Specifications

  • Explosion Proof for Division 1 and 2 Environments 
  • Epoxy Coated NEMA 4X Cast Aluminum Enclosure with Low Copper Content
  • Adjustable Ranges from -180° to 650°F
  • Internal Adjustment or External Dials with Tamper-Resistant Cover
  • Choice of One or Two SPDT Switch Output
  • Terminal Block Wiring
  • Now SIL 2 certified by Exida (SIL 3 capable)

Specifications, Manuals, and Supporting Literature

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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

Adjustable Range Max Temp
°F/°C
Bulb Size
x Length
Catalog
Number
°F °C
-125 to 350
-40 to 120
0 to 250
0 to 400
50 to 650
-85 to 175
-40 to 50
-20 to 120
-20 to 200
10 to 340
400/200
170/75
300/145
450/230
700/370
3/8" x 2-7/16"
3/8" x 6-3/4"
3/8" x 4-1/2"
3/8" x 3"
3/8" x 3-1/4"
F120-2BS
F120-4BS
F120-6BS
F120-7BS
F120-8BS
E121: One SPDT output, external calibrated reference scale, 304 SS bulb and
6 ft. capillary.
-20 to 80
25 to 100
30 to 250
100 to 400
350 to 640
25 to 325
-30 to 25
-5 to 35
0 to 120
35 to 200
175 to 335
Heat Trace
130/55
150/65
300/150
450/230
690/395
360/182
3/8" x 5"
3/8" x 6-3/4"
3/8" x 2-7/16"
3/8" x 2-1/8"
3/8" x 3-1/4"
1/4" x 10-1/4"
E121-5BS
E121-4BS
E121-2SBS
E121-3BS
E121-8BS
E121-13273
E122: Two SPDT outputs, external calibrated reference scale, 304 SS bulb and
6 ft. capillary
25 to 100
30 to 250
100 to 400
350 to 640
-5 to 35
0 to 120
35 to 200
175 to 335
150/65
300/150
450/230
690/395
3/8" x 6-3/4"
3/8" x 2-7/16"
3/8" x 2-1/8"
3/8" x 3-1/4"
E122-4BS
E122-2BSB
E122-3BS
E122-8BS
Adjustable Range Max Temp
°F/°C
Stem Length Catalog
Number
°F °C
B121: One SPDT output, 1/2" NPT connection, external calibrated reference scale,
tamper-resistance cover, nickel-plated brass immersion stem.
0 to 225
200 to 425
15 to 140
-15 to 105
95 to 215
*
275/135
475/245
160/71
1-7/8" BT
1-7/8" BT
2-11/16" BT**
B121-120
B121-121
B121-13272
B122: Two SPDT outputs, 1/2" NPT connection, external calibrated reference
scale, tamper-resistance cover, nickel-plated brass immersion stem.
0 to 225
200 to 425
-15 to 105
95 to 215
275/135
475/245
1-7/8" BT
1-7/8" BT
B122-120
B122-121
0 to 225
200 to 425
-15 to 105
95 to 215
275/135
475/245
1-7/8" BT
1-7/8" BT
C120-120
C120-121

Notes
* Freeze Protection
** 9/16" O.D. stainless steel stem

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