The EX378B02 is an INDUSTRY EXCLUSIVE prepolarized condenser microphone system. It is Hazardous Areas & Explosive Atmospheres compliant and can safely be employed in gaseous hazardous environments where standard microphones may cause a spark and fire. The EX378B02 is equipped with a Free-field microphone cartridge and complies with Intrinsic Safety Protection Levels for all above ground applications globally, and complies with below ground Very High (Ma) Mine Safety protection levels for all mining locations outside of North America.

This design utilizes PCB’s most popular microphone cartridge, an IEC 61094-4 working class compliant ½” Free-field prepolarized microphone, model 377B02. We place this 0V microphone into a spark resistant package that complies with ATEX, IECEx, EN (International), and ETL (Domestic) North American standards, resulting in the world’s first test and measurement grade condenser microphone and preamplifier combination designed for hazardous areas.


  • ATEX, IECEx, and ETL c/us approvals
  • I M1 Ex ia I T4 -40°C = Tamb = 80°C
  • Class 1, Division 1, Groups A, B, C,
    and D
  • Class 1, Zone 0, AEx ia/Ex ia IIC T4 Ga
  • Prepolarized (0V) design
  • 15.5 dBA to 137 dB capability
  • High sensitivity, 50 mV/Pa
  • Uses cost effective coaxial cables
  • A2LA, ILAC accredited
  • CE MARKED, RoHS Compliance


  • Leak detection
  • Mine safety
  • Gas tank testing
  • Environmental noise monitoring
  • Measurements in potentially
    hazardous areas


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