SOR pressure switches are field-proven, low-cost process instruments for use in either primary or redundant pressure applications in a wide variety of industries. Even though the technology is proven by the original Static “O” Ring mechanical switches that set industry standards more than 50 years ago, we continue to expand our product offerings to meet changing industry needs. SOR pressure switches are designed and offered with several agency approvals, housing enclosures, and switching configurations to meet the demands of global markets. The large selection of product components provides the optimal instrument specifications to handle the toughest of applications.

Depending on the installed application, pressure switches may be required to contain an explosion of a specified gas, vapor, or dust which may occur within it. Other requirements may be to isolate the switching mechanism from the elements and corrosive environments or atmospheres or be weathertight for external use. SOR switches are engineered to exceed the minimums of the required agency approval standards.

Our pressure switches are designed for high performance

  • Engineered with tight tolerances
  • High resolution of set points
  • High repeatability
  • Narrow dead band
  • Negligible temperature effect

Engineered to your specifications

  • All pressure switches may be customised to meet your specific requirements
  • A wide selection of wetted parts – the cost of purchase is less expensive by eliminating secondary components such as a seal
  • A variety of process connections and sizes 

Built tough and field-proven

  • Rugged, high-cycle rate of tolerance, long life, vibration resistant
  • Excellent corrosion resistance – performs in harsh environments
  • Simple installation

Safety Certified to IEC 61508 (SIL)

  • Most pressure switch models meet requirements for non-redundant use in SIL1 and SIL2 Safety Instrumented Systems

Worldwide service and fast delivery

  • Factory Sales Engineers & Representatives provide prompt service
  • Emergency shipments sent same day air

Long-lasting and cost-effective

  • Saves at the purchase – no extra parts to order
  • No charge for factory calibration
  • Modular design
  • No periodic service required
  • Three-year warranty – one of the longest in the industry

Still, need more convincing? Take a look at our “Weigh Your Instrumentation Options: Switch, Transmitter or Hybrid” white paper. Switches are incredibly reliable and cost-effective where the process variable need only be controlled within upper and/or lower bounds due to lower installed costs and much longer service life when compared with a transmitter of similar quality.

What you still might not know about pressure switches

  • There are few devices, if any, more reliable in the harshest environments
  • Modern switches can directly replace decades-old switches without additional wiring
  • There is not a transmitter that can beat the reaction time of a SOR pressure switch

Certifying Agencies

ATEX (certified by Baseefa, DEMKO, or KEMA)





IECEx (certified by Baseefa or Standards Australia)


PESO (CCOE – India)



Rostechnadzor (RTN)

SIL, TestSafe (SAA – Australia)



Available Listings

Ordinary Locations and Hazardous Locations
SIL Level Switch Certificate
SIL Pressure Switch Certificate

Available Hazardous Locations Protection Methods

Explosion Proof/Flameproof (d)
Intrinsic Safety (ia)
Encapsulation (m)
Special Protection (s)
Combustible Dust (tD)
Energy Limited (nL)

Division 1, Division 2
Class I, Class II, Class III
Groups A-G

ul certification