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Posted By artisdeeian
Hi Guys.
Anyone used the 'Castle' Ga113 Noise level meter, and if so what did you think of it. I hired it from Castle of Scarborough. With hinesight I probably should have hired one that measures Octave band levels for easy calculation, to determine ear protection types.
I have just carried out a noise risk assessment at one of our factories, and although a last resort it looks like we will have to rely on PPE.
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Posted By Paul Leadbetter
Ian
I haven't used that instrument so can't comment.
If you didn't take octave band SPLs, how are you going to choose appropriate hearing protection?
Although you may rely on PPE in the short-term, you should consider reduction of noise at source; it is not always expensive but may need a little planning.
Paul
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Posted By Jim Walker
To be pedantic -I think you hired a sound level meter ;-)
Please look at noise level reduction, solutions can often be a damn sight easier & cheaper that maintaining PPE controls.
One place I was at, we used a different type/style of tooling, the productivity gains paid for these in a matter of weeks, noise levels were 50% lower.
Another case: had a extraction fan balanced cut noise, reduced electricity consumption, save the motor bearings.
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Posted By lewes
Why cant you use the A and C weighted readings to determine the hearing protection level?
That way you can use either the HML or at very worst the SNR method. Octave bands is the best but it does also depend on the industry type and the type of noise.
Likewise I have never used the Castle noise meter so cant comment.
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Posted By lewes
Ooops.
Forgot to add like others have said.
Under the noise at work regs you have three main steps to take:
1. Control at source (noisy bearings, gearbox etc)
2. Control the transmission path. (How does the noise get to you, barriers/enclosures etc)
3. As a last resort, consider the issue of PPE
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Posted By Descarte
"Why cant you use the A and C weighted readings to determine the hearing protection level?"
I belive it is due to different hearing protection types and makes offering different attenuation to different wavelenghts of noise.
Thus 95dba maybe protected by one type of hearing protection but not another depending on the noise frequencies.
Each manufacturer will give you their own data for what their hearing prtection and frequency attenuation is. This should be used in conjunction with the octave band analysis to ensure exposure is actualy reduced.
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Posted By Adrian Watson
Descarte,
Lewes is correct; you can use the dBA - dBC sound pressure measurements to select Noise Protection Devices using the HLM method. See P108 of Controlling noise at work HSE 2005.
Regards Adrian Watson
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