Industrial Dosemeter, personal sound exposure meter – GA257B

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.

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 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:

• 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

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

Standards: IEC61672-1-2002 (Sound Level Meters), IEC61252-1993 (Personal Sound Exposure Meters)

Linear Operating range: 70dB

Detector Characteristics: RMS and Peak

Exchange rate: 3dB, 4dB or 5dB

Criterion Level: 75dB, 80dB, 85dB or 90dB

Threshold Level: -5dB, -10dB or OFF

Peak: 3dB above top of selected range

Display: Custom alphanumeric LCD, digit size 7mm x 5mm

Memory: 4800 Data Intervals Maximum

Calibration: 91.0 to 120.0dB @ 1KHz

Batteries: 1 x PP3 (9V) Approximately 12 hours continuous use

Operating Temperature: Operating Range: -10 to + 50 C

Humidity: Effect: < 0.5dB from 25% to 90% RH Vibration: No effect on instrument Processing: A to D Converter: 12-bit, 325kHz sampling. 8MHz, micro-controller Dimensions: 60mm (width) x 35mm (depth excluding pocket clip) x 135mm (height) Microphone cable length: 800mm (including rubber sleeve and microphone) Weight: 220g (including battery)