12 Series

SIL 2 Certified, vibration-resistant, 316 stainless steel pressure, differential pressure and temperature switches

12 Series hazardous location switches are ideal for operation in tough applications where space is at a premium. A snap-action Belleville spring assembly is used to provide vibration resistance and prolonged switch life. The 316 stainless steel enclosure and hermetically sealed switch provide rugged protection from the environment. Approved for use in hazardous locations worldwide, the 12 Series is installed within applications ranging from offshore oil rigs to rotating equipment, and more.


  • Class 1, Divisions 1 & 2, Zone 1
  • UL listed, cUL certified, ATEX flame-proof & CE (LVD, PED) compliant, dual seal compliance to ANSI/ISA 12.27.01
  • Compact, 316 stainless steel enclosure
  • Belleville spring design provides set-point stability and vibration resistance
  • SPDT or DPDT hermetically sealed switches
  • Variety of pressure sensor materials, including welded stainless steel diaphragm
  • Convenient field adjustment through concealed adjustment compartment; optional cover locking ring prevents incidental tampering
  • 72” lead-wire with strain relief provided
  • Adjustable set-point ranges:
    • Pressure: 1 to 12,500 psi
      0,1 to 861,9 bar
    • Differential Pressure: 0.7 “wcd to 150 psid
      1,7 mbar to 10,3 bar
    • Temperature: -130 to 650 ºF
      -90 to 343.3 ºC


Visit our Certifications Page for all 12 Series Certifications

  • 316 Stainless Steel Construction
  • Hermetically Sealed Micro-switch
  • Belleville Actuated
  • UL, cUL approved and ATEX compliant
  • Dual Seal Certified
  • Adjustable Pressure Ranges:
    • Pressure: 30″ Hg Vac to 12,500 psi
      (-1 to 861,9 bar)
    • WC Ranges: -20″ wc Vac to 200″ wc pressure
      (-49,8 to 497,8 mbar)
    • Differential Pressure: 0.7” wcd to 150 psid
      (1,7 mbar to 10,3 bar)
    • Temperature: -130°F to 650°F
      (-90°C to 340°C)
Dual Seal Certified
  • cUL certified to ANSI/ISA 12.27.01
  • Complies with CEC rule 18-072 and NEC 501.17 requirements for providing a secondary seal between the process and electrical connections, and indication of primary seal failure should one occur
  • Decrease labor time and cost by eliminating externally connected secondary seals
  • Compact and hermetically sealed switch with a 316 stainless steel enclosure. *Dual Seal is Included.

Installations Manuals

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