Model PCA

Compact pressure switch, flameproof enclosure Ex d

For the process industry

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Applications of the mechanical pressure switch

  • Pressure monitoring and control of processes
  • Safety-critical applications in general process instrumentation, especially in the chemical and petrochemical industries, oil and gas industries, power generation incl. nuclear power plants, water/wastewater industries, mining
  • For gaseous and liquid, aggressive, highly viscous or contaminated media, also in aggressive ambience
  • For measuring points with limited space, e.g. control panels

Special Features of the mechanical pressure switch

  • No power supply needed for switching of electrical loads
  • Robust switch enclosure from aluminium alloy or stainless steel with identical dimensions, IP66, NEMA 4X
  • Setting ranges from 0.2 ... 1.2 to 200 ... 1,000 bar, vacuum ranges
  • Repeatability of the set point ≤ 1% of span
  • 1 set point, SPDT or DPDT, high switching power up to AC 250 V, 15 A

Description of the mechanical pressure switch

The high-quality mechanical pressure switches have been developed especially for safety-critical applications with limited space. The high quality of the products and manufacturing in accordance with ISO 9001 ensure reliable monitoring of your plant.

In production, the mechanical pressure switches are traced by quality assurance software at every step and subsequently are 100 % tested.

All wetted parts are from stainless steel as a standard. The switch enclosure is available in aluminium alloy or stainless steel. To adjust the set point simply open the access cover plate. This access can be sealed as an option. The access to the terminal block for the electrical connection is protected by a screw-on lid, which is secured with a screw-type lock against unauthorised intervention.

A micro switch integrated in the mechanical pressure switch enables the direct switching of an electrical load of up to AC 250 V, 15 A.

Depending on the application, the appropriate variant for the contact version and the electrical connection can be selected; e.g., hermetically sealed micro switches are suitable for corrosive ambient conditions and DPDT contact versions for two separate circuits.
By using a diaphragm element with antagonist spring as sensor element, the model PCA mechanical pressure switch is extremely robust and guarantees optimal operating characteristics. For safety applications, the mechanical pressure switch is optionally available in a SIL 2 qualified or a SIL 3 qualified version.

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