Sound_Level_Meters_and_Dosimeters_Presentation.pptx

Noise measurement

1. Sound Level Meters and Dosimeters Detailed Overview and Compliance with Legal Standards

2. Overview of Sound Level Meters Sound level meters are devices used to measure sound pressure levels in a variety of environments, ensuring compliance with legal standards for noise exposure in the workplace.

3. Class 2 Integrating Sound Level Meters • Class 2 integrating sound level meters are used for precise noise measurement. • They must have an in-date certificate of test and a suitably tested calibrator. • These meters integrate noise levels over time to provide an average value, known as L eq.

4. Simple Sound Level Meters (SSLMs) • SSLMs give a read-out of the sound level at a specific moment. • They usually allow switching between A-weighting and C-weighting. • Suitable for measuring continuous or intermittent periods of steady noise. • Useful for routine spot checks but not adequate for compliance with legal standards.

5. Integrating Sound Level Meters (ISLMs) • ISLMs measure noise levels over time and integrate them to give an average value (L eq). • Used for more comprehensive noise assessments. • Preferred for determining compliance with legal noise exposure standards.

6. Personal Sound Exposure Meters (Dosimeters) • Dosimeters measure the total noise dose over a working period. • They are worn by the individual and consist of a small recording unit and a flexible microphone. • The microphone should be positioned close to the operator's head for accurate results, but not too close to the body to avoid reflection errors. • Compliant with BS EN 61252 standards for legal use in noise exposure assessments.

7. Dosimeters in Dynamic Workplaces • Dosimeters are useful where workers move frequently, making static measurements impractical. • Portable and wearable, they provide more flexibility in assessing noise exposure in dynamic environments. • However, misuse or interference (e.g., tapping the microphone) can affect accuracy.

8. Compliance and Standards • Class 2 integrating sound level meters must be calibrated and have an in-date certificate of test. • Dosimeters must comply with BS EN 61252 for legal compliance in noise assessments. • Ensure regular testing of equipment and adherence to legal standards for accurate noise exposure measurements.