The SonoLab Noise Attenuation Testing Programme enables an employer to test SonoLab Instant Fit Custom Moulded Earplugs once they are made, by inserting a microphone into the plug and connecting it to a speaker.
When the speaker emits a ‘white noise’ sound across seven frequency ranges, the software reads the noise levels both inside and outside the ear, and calculates the Personal Attenuation Rating (PAR).
As every ear canal is unique, there are different readings for different users. Individual user information is then translated on to a PDF document to create an accredited certificate that can be stored on the user’s profile in the workplace.
You can choose the most appropriate attenuation level when you use Sonolab Instant Fit Custom Moulded Earplugs. This means that where it’s necessary, you have easy communication without the need to remove the ear plugs.
The variations in attenuation level are attained through the use of specific filters, made of mesh fabric contained inside a metallic stainless steel cylinder. These acoustic dampers allow you to reach the optimal protection outcome which is between 75-80dB (noise reaching eardrum).
Three models of filters are available: Black ‘Full Block’ SNR 27; yellow SNR 24 and Red SNR 21.
|ATTENUATION DATA: EN 352-2: 2002*|
|Test frequencies (Hz)||63||125||250||500||1000||2000||4000||8000||SNR||H||M||L|
|Black (Full Block)||Mf (dB)||29.5||30.5||27.1||26.1||25.7||36.3||34.8||43.1||27||29||23||23|
Note: North American ANSI S12.6-1997(B), ANSI S3.19-1974 and Australia AS/NZ S1270:2001 use different calculation methods. To find out more regarding technical specifications, certifications and attenuation data corresponding to these and/or any other standard, please contact us.
To gain accreditation for the CE Mark we had to go through the testing of 16 individuals where the attenuation rating was recorded over 8 frequency ranges. As you will see, the average overall PAR rating exceeds the 30dB we publicise.
|Freq (Hz)||63||125||250||500||1000||2000||4000||8000||Individual Par|
|Ave. Freq. Attenuation||29,5||30,2||27,1||26,1||25,7||36,3||34,8||43,1||31,6|
Noise-induced hearing loss has become the number one industrial injury claim in the UK.
Until now it’s been almost impossible for an employer to refute such a claim.
This is because most testing is subjective. It relies on the person being tested wearing a pair of earphones over their protection device, and pressing a button when they can no longer hear the noise. The subjective decision of when to press lies with the claimant, and the employer is powerless.
Now, there is a solution which provides an objective way of testing certain hearing protection, placing strong evidence in the employer’s hands.
The test provides a personal attenuation rating (PAR) not only for each employee, but also for each of his or her ears. This is important because each individual experiences a slightly different level of attenuation from other people, and each ear is usually different too.
The equipment is designed to test the attenuation provided by SonoLab Instant Fit Custom Moulded Earplugs, and comprises:
The dual-microphone probe fits deep inside the uniquely-designed hearing protection device (HPD). A moderate white noise is emitted from the speakers, at approximately 85 decibels – exactly the same level for every person being tested. The microphone simultaneously measures the sound pressure beneath the device (see ‘A’ on illustration to the right) and at the outside surface of the hearing protection device (see ‘B’).
‘A’ is measured using the microphone probe, which is inserted into a sound bore that traverses the length of the HPD. Sound pressure level is compared inside and outside the HPD. The difference in decibels measures the noise reduction provided by the HPD.
During the process, the software applies compensation factors/tolerances derived from rigorous laboratory testing, so the results are accurate.
Each employee test is recorded on the SonoLab software, giving Reportable Personal Attenuation Rating.
Minimum computer requirements for installing the SonoLab Noise Attenuation Testing Software are:
Processor Intel Pentium IV or AMD
Processor speed I GHz (2.4 GHz recommended)
RAM 512 MB (1GB recommended)
Screen resolution 1024 x 768
Operating system (32 x 64 bit) Windows 2000, Windows XP, Vista, Windows 7 . Must run with Administrator Privileges
Free disk space 120 MB
USB port 1 USB VI.I
Internet access Dialup 56 Kbps (Cable or DSL preferred )
Installation drive CD-ROM, DVD drive, USB
All statements, technical information and recommendations contained in this document are based upon tests or experience that SonoLab believes to be reliable. However, many factors beyond SonoLab’s control can affect the use and performance of a SonoLab product in a particular application, including the conditions under which the product is used and the time and environmental conditions in which the product is expected to perform. Since these factors are uniquely within the user’s knowledge and control, it is essential that the user evaluate the SonoLab product to determine whether it is fit for a particular purpose and suitable for the user’s method of application.
Warranty and limited remedy
Unless stated otherwise in SonoLab’s product literature, packaging inserts or product packaging for individual products, SonoLab warrants that each SonoLab product meets the applicable specifications at the time SonoLab ships the product. Individual products may have additional or different warranties as stated on product literature, packaging inserts or product packages. SonoLab makes no other warranties, express or implied, including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose or any implied warranty arising out of a course of dealing, custom or usage of trade. User is responsible for determining whether the SonoLab product is fit for a particular purpose and suitable for user’s application. If the SonoLab product is defective within the warranty period, your exclusive remedy and SonoLab’s and seller’s sole obligation will be at the SonoLab’s option, to replace the product or refund the purchase price.
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Except where prohibited by law, SonoLab and seller will not be liable for any loss or damage arising from the SonoLab product, whether direct, indirect, special, incidental or consequential, regardless of the legal theory asserted, including warrant, contract, negligence or strict liability.