Switches > Pressure/Vacuum Switches > UE 120 Series

 

United Electric (UE) Series 120 Explosion-Proof Pressure 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

  • One or Two SPDT Outputs, Optional DPDT or Hermetic Seal Switch Outputs Available
  • Internal Adjustment with Reference Scale or External Calibrated Dials with Tamper-Resistant Cover
  • UL, CSA Approvals for Class I, Divisions 1 and 2 Environments, CENELEC Flame-Proof Enclosure or FM Approval Available on Some Models
  • Welded Diaphragm or Bellows Sensor
  • Pressure Ranges from 30" HgVac to 6000 PSI
  • 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
Deadband Proof Pressure Catalog Number
H121: Single SPDT switch with external adjustment via reference dial, single conduit.
Brass bellows, nickel-placed brass 1/4" NPTF pressure connection
0 to 20 PSI
0 to 100 PSI
0.1 to 0.5 PSI
0.2 to 0.8 PSI
25 PSI
125 PSI
H121-144
H121-156
Buna-N diaphragm and O-ring with nickel-plated brass 1/4" NPTF pressure connection
(Limited to process temperatures below 200°F.)
50 to 500 PSI 3 to 12 PSI 2500 PSI H121-704
H122: Dual SPDT switch with external adjustment via reference dial, single conduit
Brass bellows, nickel-plated brass 1/4" NPTF pressure connection
0 to 20 PSI
0 to 100 PSI
0.2 to 1 PSI
0.4 to 1.6 PSI
25 PSI
125 PSI
H122-144
H122-156
Buna-N diaphragm and O-ring with nickel-plated brass 1/4" NPTF pressure connection.
(Limited to process temperatures below 200°F)
10 to 100 PSI
200 to 1000 PSI
2 to 10 PSI
10 to 50 PSI
1000 PSI
2500 PSI
H122-702
H122-705
316L SS bellows and 1/4" NPTF pressure connection
0 to 200 PSI
0 to 300 PSI
0 to 500 PSI
3.0 to 16 PSI
4.0 to 18 PSI
6.0 to 24 PSI
250 PSI
350 PSI
575 PSI
H122-358
H122-361
H122-376
Teflon diaphragm and O-ring, 316 SS cap, 1/4" NPTF pressure connection
0 to 20 PSI
0 to 100 PSI
0.1 to 0.6 PSI
0.5 to 1.5 PSI
225 PSI
225 PSI
H122-553
H122-555
Buna-N O-ring, 303 SS piston and 1/4" NPTF pressure connection.
(Not recommended for gas service)
125 to 3000 PSI 80 to 500 PSI 10000 PSI H122-612
Welded 316L SS bellows and 1/2" NPTF pressure connection
0 to 20 PSI
0 to 30 PSI
0 to 100 PSI
0 to 200 PSI
0.2 to 1 PSI
0.2 to 0.6 PSI
0.2 to 0.8 PSI
0.6 to 4.0 PSI
25 PSI
40 PSI
125 PSI
200 PSI
H122-S144B
H122-S146B
H122-S156B
H122-S164B
J120: Single SPDT switch with internal adjustments, and dual conduits
Brass bellows, nickel-plated brass 1/4" NPTF pressure connection
0.5 to 20 PSI
1 to 50 PSI
2 to 100 PSI
0.1 to 0.3 PSI
0.1 to 0.5 PSI
0.2 to 0.6 PSI
25 PSI
75 PSI
125 PSI
J120-144
J120-152
J120-156
Buna-N diaphragm and O-Ring, aluminum cap, 1/4" NPTF pressure connection
2 to 80" WC
0.5 to 20 PSI
0.8 to 2.0" WC
0.05 to 0.1 PSI
225 PSI
225 PSI
J120-451
J120-453
316 SS bellows, 1/4" NPTF pressure connection.
(Not recommended for rapid or high cycling pressure changes.)
100 to 1700 PSI 9.0 to 23.0 PSI 2500 PSI J120-680
J120: Single SPDT switch with internal adjustments, and dual conduits.
Phosphor bronze bellows, nickel-plated brass 1/4" NPTF pressure connection
4 to 200 PSI 1 to 4 PSI 250 PSI J120-270
Welded 316L SS bellows, 1/4" NPTF pressure connection
0.5 to 20 PSI
1 to 50 PSI
2 to 100 PSI
4 to 200 PSI
0.1 to 0.3 PSI
0.1 to 0.5 PSI
0.2 to 0.6 PSI
0.2 to 1.0 PSI
25 PSI
50 PSI
125 PSI
200 PSI
J120-S144B
J120-S152B
J120-S156B
J120-S164B
Welded 316L SS bellows, 1/4" NPTF pressure connection
15 to 100 PSI
15 to 200 PSI
20 to 300 PSI
25 to 500 PSI
0.7 to 1.8 PSI
1.0 to 3.0 PSI
1.0 to 4.0 PSI
1.5 to 5.0 PSI
800 PSI
800 PSI
800 PSI
800 PSI
J120-356
J120-358
J120-361
J120-376
Buna-N diaphragm and O-Ring, nickel-plated brass 1/4" NPTF pressure connection.
(For process temperatures below 200°F)
3 to 100 PSI
9 to 300 PSI
30 to 1000 PSI
1.0 to 4.0 PSI
1.0 to 5.0 PSI
3.0 to 20.0 PSI
1000 PSI
1000 PSI
2500 PSI
J120-702
J120-703
J120-705
Teflon diaphragm and O-ring, 316 SS cap, 1/4" NPTF pressure connection.
2 to 80" WC
30" HgVac - 20 PSI
0.5 to 20 PSI
0.8 to 30 PSI
2 to 100 PSI
1.0 to 4.0" 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
225 PSI
225 PSI
225 PSI
225 PSI
J120-551
J120-552
J120-553
J120-554
J120-555
Buna-N O-ring, 303 SS piston and 1/4" NPT pressure connection.
(Not Recommended for gas service)
125 to 3000 PSI 40 to 250 PSI 10000 PSI J120-612
Buna-N diaphragm, O-ring, epoxy-coated aluminum 1/2" NPTF pressure connection,
large 0.72" orifice for clean-out purposes.
2.5" WC 0.1 to 6" WC 400 PSI J120-524
316L SS diaphragm, Viton GLT O-Ring, 316 SS 1/2" NPTF pressure connection.
Large 0.72" orifice for clean-out purposes.

(Model 189 has NACE MR-0175 compliant 316L SS 1/2" NPTF pressure connection.)
2 to 50 PSI
4 to 100 PSI
8 to 200 PSI
250 to 3500 PSI
0.3 to 3.0 PSI
0.5 to 6.0 PSI
1.0 to 11.0 PSI
50 to 300 PSI
1000 PSI
1000 PSI
1000 PSI
7000 PSI
J120-184
J120-185
J120-186
J120-189
Welded 316 SS diaphragm, 1/2" NPTF pressure connection. Large 0.72" orifice for
clean-out purposed. NACE MR-0175 compliant.
5 to 30 PSI
10 to 100 PSI
20 to 500 PSI
1.0 to 6.0 PSI
3.0 to 15.0 PSI
4.0 to 45.0 PSI
2500 PSI
2500 PSI
2500 PSI
J120-190
J120-191
J120-193
2" sanitary welded 316L SS diaphragm and pressure connection. For TriClamp®
fitting systems. Designed to meet 3-A Sanitary Standards
5 to 30 PSI
10 to 100 PSI
15 to 300 PSI
1 to 5 PSI
1 to 12 PSI
3 to 22 PSI
1500 PSI
1500 PSI
1500 PSI
J120-565
J120-566
J120-567

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