12 Series Overview

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.


         Now available with stainless steel accessories (e.g. junction box)






Product Overview




  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

  Available with stainless steel accessories (e.g. junction box)

  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


  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



  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)





Storage Temperature                   -58° to 203°F (-50 to 80°C)


Operating Ambient                      -58 to 203°F (-50 to 80°C). Set point shifts less than 1% of range for a 50°F

   Temperature                                 (28°C) ambient temperature change. Slight ambient effects for 25-50’ extra

                                                          capillary length on temperature switch models, consult factory.


Media Temperature                      Pressure models: Sensor types 2, 7, 9: -50 to 400°F (-45 to 204°C)

                                                         Sensor types 3, 4, 8: -20 to 200°F (-28 to 93°C)

                                                         Sensor types 5, 6: 0 to 320°F (-18 to 160°C)

                                                         Sensor type P, W: 0 to 200°F (-18 to 93°C); 20 to 250°F (-7 to 121°C) for

                                                         optional Viton sensor

                                                         Differential pressure models: Sensor type K: 0 to 180°F (-18 to 82°C);

                                                         20 to 250°F (-7 to 121°C) for optional Viton sensor

                                                         Temperature models: See model chart (Pg. 9).



Set point                                      Temperature models: ±1% of adjustable range

   Repeatability                                Pressure models: Sensor types 2, P: ±1.5% of adjustable range

                                                         Sensor types 3-9, W: ±1% of adjustable range

                                                         Differential pressure models: K1 to K3: ±1%, K4 to K6: ±1.5% of adjustable range


Shock                                            Differential pressure and temperature models: set point repeats after

                                                         15 G’s, 10 millisecond duration

                                                         Pressure models: Set point repeats after 75 G’s, 10 milliseconds



Vibration                                       Differential pressure and temperature models: Set point repeats after

                                                         2.5 G’s, 10-2000 Hz.

                                                         Pressure models: Set point repeats after 15 G’s, 10-2000 Hz



Enclosure                                     316 stainless steel


Enclosure Classification             Certified to Enclosure Type 4X

                                                         Class I, Division 1 product meets enclosure Type 7; Class II, Division I

                                                         product meets enclosure type 9.

                                                         Certified to IP66 requirements



Switch output                              Code S: One SPDT, hermetically sealed.

                                                         Code D: Two SPDT for DPDT action, hermetically sealed



Electrical rating                            Code H: 5 A at 125/250 VAC, 5 A resistive and 3 A inductive at 28 VDC.

                                                         Silver contacts

                                                         Code L: 1 A at 125 VAC, 1 A resistive and 0.5 A inductive at 28 VDC

                                                         Bifurcated gold contacts


Electrical  Connection                 Code N: 1/2" NPT (male) with 72" leadwires

                                                         Code M: M20 metric threads, 72" leads

                                                        Option M515, 4 terminal DIN connector (DIN 43650 Form A) available SPDT only

                                                         (does not meet Div. 1 or 2, or ATEX requirements.) 


home / products / hazardous location / 12 series

Tel:  (617) 926-1000

Fax: (617) 926-4354

Do you have a  customer service or technical question?  Please email us and we will get back to you.

180 Dexter Avenue, Watertown, MA  02472-4200