Hazardous Area Approved Liquid Level Switch

Intrinsically Safe Optical Liquid Level Switch

Key features

  • ATEX, UKCA and IECEx certified
  • II 1 G Ex ia T4 Ga –30°C to +80°C (-22 °F…+176 °F)
  • Ex ia IIC T4 Ga –30°C to +80°C (-22 °F…+176 °F)
  • Metric and imperial process connection options
  • NAMUR output
  • Speed of response from the optical sensor is almost instantaneous
  • No calibration required
  • 316 stainless steel housing
  • Material compatibility with oils and most acids
  • Suitable for use in Hydrogen
  • Cable and barrier accessories available


Hazardous area approved, PST's range of intrinsically safe optical liquid level switches are designed and certified for use in demanding applications where direct contact with hydrocarbons, fuels, and flammable or explosive liquids is likely.

Using infrared technology and the principle of total internal reflection, our liquid level switches detect the presence or absence of most liquids. An almost instantaneous response time is standard, and switch point repeatability is +/- 1 mm.

PST's liquid level switches have an operating temperature range between -30°C and +80°C (-22°F…+176°F). Stainless steel housing and a choice of sensing tip materials ensure they are extremely robust and resistant to chemical attack.


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