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901 Factory set pressure switch

Introducing our advanced Factory-Set Pressure Switch! This cutting-edge device effectively monitors overpressure, vacuum, or differential pressure of both liquid and gaseous media, including aggressive substances. Boasting hassle-free operation, the pressure setting and switching differential come pre-configured by our expert manufacturer, ensuring accurate and reliable performance. For extreme temperature conditions exceeding 85°C, a durable metal or PPS pressure connection is recommended. Customisation options are available upon request, allowing you to choose different sizes, plastics, or brass nickel-plated connections. This versatile pressure switch finds wide-ranging applications and is accompanied by comprehensive technical data, a product configurator, and optional accessories to meet your specific needs.

Pressure Switch 901 Product Parameters

  • Pressure Ranges: Monitors overpressure, vacuum, or differential pressure of liquid and gaseous media, including aggressive types. Specific pressure settings are factory-set.
  • Electrical Connections: Options include a tab terminal 6.3 mm x 0.8 mm in accordance with DIN 46244 or push-on screw terminals.
  • Process Connections: Features a cable conduit M16x1.5 with integrated cable strain relief.
  • Media Compatibility: Compatible with various media; diaphragm materials include NBR, Silicone, FKM, and EPDM, with specific options like Silicone for 901.30Ex available upon request.
  • Special Features: Operates in ambient and media temperatures from –20°C to +85°C, offers a mechanical life of more than 10^6 cycles, and provides protection levels of IP54/IP65 with the appropriate protection cap. Protection class II is achievable with a protection cap. Also suitable for use in potentially explosive zones with appropriate safety measures.


Product Highlights

The Pressure Switch 901 is a versatile device designed for various applications. It offers different setting ranges to suit specific needs. The standard/extended types 901.1x have factory-set switching points between 5 mbar and 200 mbar, or 200 mbar and 1,000 mbar, with a maximum positive working pressure of 0.5 / 4 bar or 1 / 4 bar, respectively. The 901.41 type provides switching points between 500 mbar and 3,000 mbar, with a maximum positive working pressure of 10 bar. For higher pressures, the 901.51 type has factory-set points between 1.0 bar and 12 bar, with a maximum positive working pressure of 25 bar. The 901.2x type caters to negative pressure settings, ranging from -5 mbar to -200 mbar, or -200 mbar to -900 mbar, with maximum working pressures of 0.5 / 4 bar or 1 / 4 bar, respectively. It operates in ambient temperatures from -20°C to 85°C and media temperatures up to 85°C or 130°C depending on the material of the pressure connection and diaphragm. The electrical rating includes AgNi and gilded contacts, and the electrical connection is made using an AMP flat plug 6.3 x 0.8 mm according to DIN 46244. Depending on the used protection cap, the switch offers protection classes of IP44, IP54, or IP65.


  • Wastewater technology
  • Liquid level measurement
  • Pump control
  • Medical technology
To download the latest datasheet click here: Pressure Switch 901

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