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Noise Dosimeter

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The SONUS GA257B is a dedicated basic Personal Noise dosimeter fully compliant with IEC 61252:1993, giving simultaneous sound exposure (Lep'd) and maximum peak (Zpeak) measurements, an essential feature for Noise at Work Regulations assessments.
Parameters measured (both GA257B and GA257L):

  • User selectable Exchange Rate (3dB, 4dB or 5dB)
  • User selectable Criterion Level (75dB, 80dB, 85dB or 90dB)
  • User selectable Threshold Level (-5dB, -10dB or OFF)
  • Zpeak
  • % Dose
  • Lep'd (Lex)
  • % DOHR (Dose/Hour)
  • Pa2h (Lep'd expressed in Pascals)
  • Exposure Time
  • Lockable Keypad
  • Constructed from tough crack resistance plastic


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