United Electric (UE) 120 Series Explosion-Proof Differential 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

  • Working Pressure Ranges Within 30" Hg to 1000 PSI
  • Cast Aluminum Enclosures with Low Copper Content
  • Meets Class I, Divisions 1 and 2 Explosion Proof Standards
  • 1 or 2 SPDT, DPDT, or Hermetic Seal Switch Outputs
  • Optional Differential Pressure Indicator (Shown at Left)
  • Internal Adjustment and Lock or External Calibrated Dials with Tamper-Resistant Cover
  • 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 Working
Pressure Range
Catalog Number
Internal adjustment, Buna-N diaphragm O-Ring, 1/4" NPT 304 SS process conn.
3-30 PSID
10-100 PSID
30-300 PSID
50-500 PSID
1.0-5.0
2.0-8.0
2.0-15.0
3.0-20.0
1000 PSI
1000 PSI
2500 PSI
2500 PSI
0-350 PSI
0-500 PSI
0-1000 PSI
0-1000 PSI
J120K-36
J120K-37
J120K-38
J120K-39
Internal adjustment, brass bellows, 1/4" NPTF process connections. Optional 316 SS bellows 1/2"
NPT process connection and 300 psi proof pressure
3-30 PSID
10-100 PSID
0.3-1.5
0.5-2.0
180 PSI
180 PSI
30" Hg - 100 PSI
30" Hg - 150 PSI
J120K-147
J120K-157
Internal adjustment, stainless steel bellows. 1/4" NPTF process connection
10-100 PSID 4.0-10.0 500 PSI 0-350 PSI J120K-367
Internal adjustment, BUNA-N diaphragm, O-ring, 1/4" NPTF aluminum process connection
5-80" WC
2-20 PSID
3-30 PSID
1.0-4.0" WC
0.1-0.3
0.1-0.4
225 PSI
225 PSI
225 PSI
30" Hg - 225 PSI
30" Hg - 225 PSI
30" Hg - 225 PSI
J120K-455
J120K-456
J120K-457
Internal adjustment, Teflon diaphragm, 1/4" NPTF aluminum process conn.
10-100 PSID 0.2-1.0 225 PSI 30" Hg - 225 J120K-559
Adjustable
Range
Deadband Proof Pressure Working
Pressure Range
Dial
Divis.
Catalog Number
External calibrated dial, tamper resistant cover, brass bellows, 1/4" NPTF process connection.
Optional 316 SS bellows, 1/2" NPT process connection, 300 psi proof pressure.
Indication option available models 147-S157B
3-30 PSID
10-100 PSID
0.3-2.0
0.5-3.0
180 PSI
180 PSI
0-100 PSI
0-150 PSI
0.5 PSI
2 PSI
H121K-147
H121K-157
External Calibrated dial, tamper resistant cover, Buna-N diaphragm, O-ring, 1/4" NPTF
aluminum process connection
2-20 PSID
2-30 PSID
0.1-0.3
0.1-0.4
225 PSI
225 PSI
30" Hg-225 PSI
30" Hg-225 PSI
0.5 PSI
0.5 PSI
H121K-456
H121K-457
External calibrated dial, tamper resistant cover, Teflon diaphragm, 1/4" NPTF aluminum
process connection
10-100 PSID 0.2-1.0 225 PSI 30" Hg-225 PSI 2 PSI H121K-559
To Order Option Add to Catalog Number
Differential Pressure Indicator -M210

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