WIKA Miniature Pressure Switch, Flameproof Enclosure Ex d (PXA)

For the process industry


  • 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 and highly viscous or contaminated media, also in aggressive ambience
  • For measuring points with limited space, e.g. control panels

Special features

  • Compact and slim design
  • Robust switch enclosure from stainless steel 316, IP66, NEMA 4X
  • Wide selection of setting ranges available, 1 … 2.5 bar to 200 … 1,000 bar
  • Set point repeatability of ≤ 1 % for reliable switching
  • High switching power and large selection of contact variants and electrical connections

Sales Contact (Wika.sales@asyatrafo.com)




These high-quality mechanical pressure switches have been developed especially for safety-critical applications. The great advantage of mechanical pressure switches is that no supply voltage is required for the switching process.

In production, the switches are traced by quality assurance software at every step and subsequently are 100 % tested.
Due to its compactness, the model PXA pressure switch can be installed in measurement environments with limited space. The robust switch enclosure from stainless steel 316 can withstand the rough and corrosive operating conditions of the process industry with working ranges of up to 1,000 bar.

The pressure switch is fitted with micro switches, which make it possible to switch an electrical load of up to AC 250 V, 5 A directly within a repeatability of 1 % of the set point.
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.
A Belleville spring ensures simultaneous triggering of the DPDT contact and increases the stability and vibration resistance due to the snap-acting behaviour.
For safety applications, the pressure switch is optionally available with SIL-2 or SIL-3 capability.