How to protect yourself?
To choose the correct product for hearing protection.
- Identify the nature of the noise: stable, fluctuating, intermittent, pulse.
- Measure the noise at the working station: intensity (dB) and volume (Hz).
- Determine the exposure time.
- Calculate the reduction necessary to return to an acceptable ambient level (cf Directive 2003/10/CE).
The performance of the hearing protector (its attenuation level) must be adapted to the risk assessment of the workplace. It should bring the noise level to a level that is not harmful to health, while avoiding overprotection would cut the operator from his environment (warnings, communication...).
Attenuation values for noise
How do you use the attenuation values?
3 indicators, from the simplest to the most precise are made available to the user:
- SNR (Single Number Rating): Single average value of attenuation.
- HML : Attenuation values expressed in terms of average levels of frequency:
- H : Attenuation of PPE at high frequencies (pitched noises)
- M : Attenuation of PPE at medium frequencies
- L : Attenuation of PPE at low frequencies (bass sounds)
- APV (Assumed Protection Value) : Attenuation values expressed on 8 specific frequency levels (see the data sheet of the hearing protector).
Level of noise