How is noise measurement carried out in the workplace?
How is noise measurement carried out in the workplace?
What does dosimetry involve?
Professional noise measurement usually follows the international standard ISO 9612. The most accurate approach, known as the 'full-day method', involves continuously measuring noise exposure throughout the entire work shift in order to determine the exact daily dose. The process consists of three clear steps:
Workplace analysis (preparation)
A noise measurement must be thoroughly prepared before it can take place:
- A specialist assesses the workplaces and working conditions. They look at the length of the work shift, breaks, locations, noise sources and the variety of tasks.
- Based on this analysis, employees are selected for the measurement who represent their 'homogeneous exposure group'. A homogeneous group of employees have similar work locations and tasks and therefore similar noise exposure.
- A representative measurement day is also planned: a day that can be considered an average or typical working day and on which a normal number of sources emit noise.
The measurement: dosimetry
The measurement day itself will proceed as follows:
- Individual recording: The selected employees wear a personal noise dosimeter. The dosimeter is attached at shoulder height, in close proximity to the ear, so that the recording simulates the sound heard as accurately as possible.
- All-day method: The meter continues to measure actively throughout the entire working day. This means that not only constant noises are recorded, but also (unexpected) peaks and variations during different tasks and breaks.
- Fill-in form: During the measurement, participants note down the times and locations of their activities. This allows the noise exposure for each work activity to be determined.
- Additional spot measurements: During the shift, the specialist performs manual spot measurements on various machines and processes. This adds an extra dimension to the investigation: it allows us to identify the sources of noise and estimate their contribution to the overall noise level. This provides a complete picture of the noise landscape in the workplace.
Analysis and evaluation (ISO 9612)
After the measurement, we will read and interpret the recorded data:
- The data is read out to calculate the daily exposure (LEX,8h). This is the energy average over 8 hours.
- The peak sound pressure (LCPeak) is also analysed: how many peak sounds occurred and how loud were they?
- The results are assessed against the statutory action values and limit values. Based on this assessment, it is determined what measures need to be taken by the company.
- We provide attenuation recommendations for each homogeneous exposure group. The attenuation of the ear moulds is adjusted based on these recommendations. This ensures that everyone has the appropriate attenuation for their function.
- Reporting: A detailed noise report will be drawn up and explained if required.
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