400 Series Pressure, Vacuum, Differential Pressure

and Temperature Switches



The 400 Series is a versatile family of vacuum, pressure, differential pressure and temperature switches for applications that require single or multiple switching capabilities. Dual and triple switch versions provide multi-output for alarm and shutdown,

pre-alarm and alarm, high/low limit or level staging functions.


A wide variety of microswitch and process connection options, along with a weather-tight enclosure, make the 400 Series an ideal choice for most ordinary location applications. Its worldwide use is assured with approvals and certifications to agency standards.


Widely used throughout the process industries, the 400 Series provides threshold protection and control for many critical functions. Typical installations are found in industrial gas production, energy generation including pumps, turbines and compressors, pulp and paper, and water and wastewater treatment.





Product Overview




Rugged, NEMA 4X, epoxy coated enclosure

SPDT or DPDT switch output

Easy access wiring

Single switch output

Internal reference scale and adjustable deadband available

Adjustable ranges: ◦30 "Hg Vac to 5000 psi

       • 1 bar Vac to 344 bar

       • 0.2 "wcd to 500 psid

       • 0,5 mbar d to 34,5 bar d

       • -180 to 650 ºF

       • -117 to 340ºC

  Approvals: UL, CSA, CE, TUV

  UL listed and cUL certified.

  CE compliant to low voltage directive and pressure equipment directive.

  Optional ATEX or GOST intrinsic safety compliance

  Single switch (SPDT or DPDT) output

  Welded stainless steel diaphragm models

  Ultra low pressure, “wc models

  Optional sensor material for corrosive media

  Polished stainless steel flushmount connection

  Pump switch models with wide adjustable deadband


UL listed and cUL certified. FM approved.

CE compliant to low voltage directive and pressure equipment directive.

Optional ATEX or GOST intrinsic safety compliance.

One, two or three switch outputs may be separated up to 100% of range.

Wide variety of available options and pressure sensor modules.

Most models available for immediate delivery



Storage Temperature                 -65 to 160°F (-54 to 71°C)


Ambient Temperature                -40 to 160°F (-40 to 71°C); set point typically shifts less than 1% of range for

   Limits                                          a 50°F (28°C) ambient temperature change


Set point                                     Temperature models: ± 2% of full scale range

   Repeatability                              Pressure: models 126-376, 520-535, 540-547, 570-572, S126B-S164B: ± 2% of

                                                        full scale range; models 440-457, 550-559: ± 1% of full scale range; models

                                                        610-614: ± 3% of full scale range


Shock                                          Set point repeats after 15 G, 10 millisecond duration


Vibration                                      Set point repeats after 2.5 G, 5-500 Hz


Enclosure                                     Die cast aluminum, epoxy powder coated, gasketed, captive cover screws


Enclosure Classification            Designed to meet enclosure type 4X requirements


Switch output                              One, two or three SPDT switches, may be separated up to 100% of range

                                                         except models 521-524, 531-534: 50%; models 520, 525, 530, 535, 570-572:

                                                         30%; switches may be wired “normally open” or “normally closed”


Electrical rating                           15 A 125/250/480 VAC resistive. Electrical switches have limited DC

                                                         capabilities. Consult factory for additional information.


Weight                                          Approx. 3 to 7.5 lbs.; varies with model


Electrical  Connection                One 3/4” NPT and two 7/8” diameter knockouts


Pressure Connection                  All models 1/4” NPT (female) except models S126B-S164B, 520-535: 1/2” NPT

                                                        (female); models 540-547: 1/8" NPT (female)


Temperature                               ‘E’ types use the same assemblies as ‘F’ types, however, range spans are

    Assembly                                    limited due to use of reference dials

                                                         Bulb and capillary: 6 feet 304 stainless steel

                                                         Immersion stem: models 120 &121: nickel-plated brass; optional 316L

                                                         stainless steel available


Fill                                                 Temperature Models: Model 1BS: solvent filled; models 2-8: non-toxic oil filled


Temperature                                 Type F typically 1% and type E, B & C typically 2% of range under laboratory

   Deadband                                     conditions (70°F ambient circulating bath at rate of 1/2°F per minute change)


Differential                                    Differential pressure indication available J400K, J402K models 147-S157B;

   Pressure Indicator                       accuracy approximately 1-1⁄2% mid 50% of range, 3% at ends; window is

   (option M210)                               plexiglass and gasketed; indicator may be field adjusted for approximately

                                                          ± 1% accuracy at any set point within range




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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