131 & 141 Nuclear Qualified Differential Pressure Switch

General Instructions
1 Year
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Designed for the nuclear industry, the rugged SOR 131/141 nuclear differential pressure switches have excellent long-term stability and have proven themselves in the field after several years of service. These workhorse nuclear differential pressure switches can be modified to support your uprate requirements.

  • 1E qualified
  • Adjustable ranges from 5” wcd to 180 psid
  • Long-term stability
  • Negligible temperature effect
  • HELB tested to 33Mrad
  • Quick delivery


  • MSL high flow isolation
  • ECCS pump bypass valve control
  • HPCS bypass valve control
  • RCIC high steam flow isolation
  • Level monitoring and control


• 10CFR50, Appendix B

• ANSI N45.2

• NQA-1                                                                                                         

• CSA N285.0 (Class 2 and 3 non-welded Category “F” type Fitting)

• CSA B51 Part 1

• We accept 10CFR21

Qualified by a combination of testing and analysis

• IEEE-323-1974 & 1983

• IEEE-344-1975 & 1987

Audited by

• Nuclear Procurement Issues Committee (NUPIC)

• Nuclear Industry Assessment Committee (NIAC)

• Canadian Technical Standards & Safety Authority (TSSA) N285.0

• Tractebel Engineering SUEZ Certificate nr. 3696

Compliance and qualification depends on the individual instruments.

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  • Special ranges
  • Stainless steel housing with terminal block
  • Custom engineered products for specific process applications, safety concerns or environmental demands. Consult the factory for details.