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Antiswitch pressure switch and thermostat Series 12

Series 12 pressure switches, known as Spectra 12, are ideal for installations in potentially explosive atmospheres where space is limited.

A quick-acting Belleville washer spring assembly is used which is also vibration-resistant and ensures long switch life.

The hermetic 316 stainless steel enclosure and hermetically sealed micro-switch provide complete environmental protection. Approved for use in all types of hazardous locations, Spectra 12 switches are installed in applications ranging from offshore oil rigs to rotating equipment, power applications and all types of value protections.

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Adjustable ranges

  • Pressure: 68.9 mbar at 861.9 bar
  • Differential pressure: 1.7 mbar at 10.3 bar
  • Temperature: -90 ° C to 340 ° C

Storage temperature-50 to 95 ° COperating environment temperatureOperating environment temperatureAverage temperaturePressure models:

  • Sensor types 2, 7, 9: -45 to 204 ° C
  • Sensor types 3, 4, 8: -28 to 93 ° C
  • Sensor types 5, 6: -18 to 160 ° C
  • P-type sensor: -18 to 93 ° C and -7 to 121 ° C for optional Viton sensor

Differential pressure models:

  • Type K sensor: -18 to 82 ° C and -7 to 121 ° C for optional Viton sensor

Temperature models: See attached technical sheetRepeatability of the set point

  • Temperature models: ± 1% of adjustable range
  • Pressure models: sensor types 2, P (± 1.5% of adjustable range) and sensor types 3-9 (± 1% of adjustable range)
  • Differential pressure models: K1 to K3 (± 1% of adjustable range) and K4 to K6 (± 1.5% of adjustable range)


  • Differential pressure and temperature models: the set point is repeated after 15 G, duration of 10 milliseconds
  • Pressure models: the set point is repeated after 75 G, 10 milliseconds


  • Temperature models: approximately 0.85 kg
  • Pressure models: approximately 0.34 kg
  • Differential pressure models: approximately 1.4 kg


  • Setpoint stability
  • Resistance to vibration
  • Small size
  • Compact construction in stainless steel


  • Applications where space is scarce
  • Critical applications within hazardous locations
  • Sea-based offshore platforms, chemical plants and refineries, instrument panels, rotating equipment (turbines, etc…)


  • UL, cUL and ATEX approved for Div hazardous locations. 1 or Zone 1, CEcompliant
  • The double seal complies with ANSI/ISA 12.27.01
  • Parts of the pressure switch in contact with liquids comply with NACE MR-0175

Technical specifications


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