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Vacuum switches ATEX/CSA type 181P


High voltage electromechanical differential adjustable pressure switches (max 250 Volt) ATEX. SPDT or DPDT contacts. Sealed electrical connection with free lead. Electrical protection with conduit box cap supplied separately. NPT Threaded electrical and process connections.



  1. Range: 0,4 ÷ 1,9 bar increasing
  2.              0,15 ÷ 1,8 bar decreasing
  3. Max. pressure: 17,5 bar
  4. Deadband: Fixed
  5. Electrical contacts: SPDT or DPDT
  6. Electrical connection: NPT threaded with sealed free leads
  7. Max. fluid temperaturea: -40°C ... +149°C
  8. Body and Connection materials: Aluminum or SS316
  9. Diaphragm/piston Materials: Polyimide
  10. Process connections: Threaded NPT
  11. Other options: See product details



Read the data sheet for the standard options available for materials and process connections.
Other possible executions based on customer requests for quantities

  • Vacuum switches
  • calibrated up to the value indicated by the customer
  • Vacuum switches calibrated in descent to the value
  • indicated by the customer
  • Various options available for Oil & Gas applications and hazardous areas


The Vacuum switch must be installed preferably in a vertical position with electrical connection upwards. The Vacuum switch can be damaged in the presence of impacts and high vibrations creating false contacts. Vacuum switches have sealed electrical output and outgoing wires, can and connectors and a Corten type cassette. As available options made Vacuum switches with body in acc. stainless steel, degreased for use with oxygen or gold-plated contacts for low currents. Our technical office is available for the most suitable solution for your applications. Particular attention to the external environment in which the Vacuum switches are installed. These Vacuum switches are manufactured and certified (ATEX, FM, CSA) to work in environments where there is a flammable atmosphere due to the presence of gas or other contaminations that make the use dangerous. Our technical office is available to recommend the most suitable solution.


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