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Castle GA257B SONUS Industrial Noise Dosemeter

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  • Measures average sound exposure and peak exposure simultaneously
  • 75dB to 140dB measuring range via single linear range
  • Adjustable exchange rate and criterion level

rrp £485.00

now £440.00 (Ex. VAT) £528.00 (Inc. VAT)

rrp £485.00


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  • Description

    Castle GA257B SONUS Industrial Noise Dosemeter

    The Castle GA257B SONUS Industrial Dosemeter is an advanced personal noise exposure meter designed to monitor the sound exposure of employees at work in accordance with the Noise at Work Regulations 1989. It can measure sound from 75dB to 140dB at frequencies between 20Hz and 8kHz. The meter is capable of measuring sound exposure (LEpd) and peak (Zpeak) simultaneously and can also give readings for projected LEpd over an eight-hour exposure. Dose is provided as a percentage and as dose-per-hour whilst actual sound pressure readings can be shown in either decibels or Pa2h.

    Frequency weighting is set at A but the criterion level and exchange level are user-adjustable. The one-line, eight-digit screen shows readings clearly and can also show time elapsed, battery level and overload warnings. Operation is undertaken via the simple push-button interface and the 12-hour battery life is perfect for monitoring personal noise exposure over an entire at work. As a SONUS meter, the Castle GA257B is very compact and sturdy enough to withstand the knocks of day-to-day use in industrial environments and complies with regulations such as IEC 61252-1:1993. A pocket clip allows an employee to carry the dosemeter throughout his/her working day.

    Castle part number: GA257B

    Key Features

    • Measuring range: 75dB to 140dB
    • Max linear range: 67dB
    • Frequency range: 20Hz to 8kHz
    • Integrated sound level exposure
    • Peak, dose, dose per hour, projected dose
    • Adjustable criterion level and exchange rate
    • Meets Noise at Work Regulations 1989
    • Simultaneous average and peak measurement
    • 12-hour battery life
  • Specification


    • IEC 61252-1:1993 (Personal Sound Exposure Meters)


    • Type 2 Pre-Polarised ½” (13.2 mm) Electret Free-Field, Electret Condenser Microphone, 20Hz – 8KHz ± 2dB; –32 dB ± 3 dB re 1V/Pa Custom pre-amplifier design.


    • Back-lit LCD panel (8x1 Characters)
    • Alpha-Numeric display for measured results


    • Measuring Range: 75-140
    • Linear operating range (IEC61672-1): 67dB


    • Typical ’A’ Weighting <32 dB(A) rms.


    • ‘A’ to IEC 61672-1:2002 and IEC 60651:1979+A1+A2


    • 20 Hz - 8 kHz (including microphone)
    • 1 Hz - 20 kHz (electrical characteristics)


    • Simultaneous Peak and rms


    • LEpd (Sound Exposure Level), PLEpd (Projected LEpd over 8 hours), DOSE% (LEpd compared to criterion level as %) PDOSE% (Projected DOSE% over 8 hours, DOHR (DOSE% per hour), Pa2h (LEpd displayed in Pascal units), Dose per hour, Zpeak (Max. Peak Level). 
    • Other Displays: Elapsed time, Overload, Battery Life


    • The level at which the 8 hour DOSE% = 100%. User selectable between: 80dB, 85dB and 90dB


    • The rate at which the DOSE% doubles. User selectable between: 3dB and 5dB


    • Software controlled 91.0 to 120.0 dB (1kHz) in 0.1 dB steps


    • A to D Converter: 12-bit
    • Controller: 8MHz, micro-controller


    • Batteries: 1 x 6LR61 (size PP3) 
    • Life: >12 hours (alkaline batteries, continuous operation).


    • Dimensions: 60mm (width) x 35mm (depth excluding pocket clip) x 135mm (height)
    • Microphone cable length: 800mm (including rubber sleeve and microphone)
    • Weight: 220gms (including battery)
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  • Delivery Information

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    We use DPD/Interlink for all larger items and Royal Mail for smaller items and accessories. With DPD/Interlink you will receive a 1 hour delivery window on the day of delivery via e-mail/text and a notification 15 minutes before arrival so you will not have to wait around all day. You can even manage your booking online and re-arrange delivery for another date or arrange the goods to be left with a neighbour of your choice.

    We also offer delivery options for goods required urgently on certain products, all which are sent by DPD/Interlink.

    Our charges for UK deliveries:

    • FREE Delivery (on select products only): typically 3-5 working days*
    • Standard Delivery at £4.95: 2-3 working days
    • Next Working Day Delivery (on select products only) at £7.50
    • Pre-Noon Next Working Day Delivery (on select products only) at £9.50*
    • Pre-10.30am Next Working Day Delivery (on select products only) at £18.50*
    • Saturday Pre-Noon Delivery (on select products only) at £14.50*
    • Sunday Pre-Noon Delivery (on select products only) at £14.50*

    *UK mainland only

    NOTE! For next working day or Saturday/Sunday delivery options the order MUST be placed no later than 3pm on the working day before delivery is required. After 3pm, please arrange with our staff before selecting a priority delivery service. Priority services are available to UK mainland residents only (this might exclude certain areas in the north of Scotland).

    Customers outside the UK:

    Test-Meter.co.uk exports to many countries all over the world. Prices for shipping vary on location and weight/dimensions. Costs are calculated for certain countries at the checkout. If your country is not included in this list please e-mail admin@test-meter.co.uk with your name, address and the items you would like to order for an accurate shipping quote or go to http://www.test-meter.co.uk/test-equipment-export for more information.

    For more information on delivery, please see our terms and conditions.