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Castle Group SONUS GA257 Pocket Dosemeter


The SONUS Pocket Dosemeters are designed to be powerful and easy to use. These dosemeters are small and tough so measurements and data can be collected throughout the working period. Data can be reviewed on screen or downloaded to a PC for further analysis.

There are 2 different SONUS Dosemeter models:

The SONUS GA257B is a dedicated basic dosemeter 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.

The SONUS GA257L adds logging capabilities, allowing data to be downloaded to a PC using the Castle dBdataPro noise analysis software, and measures sound pressure levels and Leq.

The GA257 noise dosemeters are easy to use and have a clear display allowing data to be read on screen. The keypad can be locked to prevent any measurements being accidentally stopped or altered. The data is stored on flash memory at user selected intervals. The built in software for this meter is designed to suit future upgrading for feature enhancements, legislative changes or instrument upgrades. With the Castle SONUS Dosemeters you will always be in step with the law.

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



The GA257L dosemeter also features:

  Lp (SPL)
  Leq
  Cpeak
  LE (SEL)
  Real Time Clock
  Data-Logging
  DC Power In
  AC Output

Each GA257 SONUS Dosemeter is supplied in its own plastic case complete with a handbook, windshield and pen.

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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Keison International Ltd. trading as:
Keison Products, VoIPon Solutions & 4Gon
keison VoIPon Solutions 4Gon