Noise Exposure at Work

Noise Exposure at Work

The XL2 Sound Level Meter provides the dedicated solution for occupational noise monitoring. All measurement data is stored on the SD card. Simultaneously the XL2 may record a wav-file.

The event recorder functionality triggers the measurement by programmable level thresholds or manually by the external input key pad. An additional scheduler triggers measurements at pre-determined times.

At a Glance

  • Noise exposure at work acc. to 2003/10/EC and ISO 9612
  • Follow the Control of Noise at Work Regulations 2005
  • Confirm compliance with health standards ISO 1999

XL2 Measurement Functions

XL2 with M4260 Measurement Microphone


Stack Light

Sound Pressure Level SPL

for noise at work monitoring
  • LAeq (averaged sound level with A-weighting)
  • LCpeak (peak sound level with C-weighting)

Both levels are measured simultaneously, thus providing the base for comparison with the action limits listed below. The real-time spectrum analyzer provides detailed results about any annoying frequency band or exact frequency.

The optional Extended Acoustic Pack offers further noise levels as required:
  • Sound Exposure Level LAE
  • LCeq - LAeq

Stack Light

The XL2 forms with the Stack Light a stand-alone solution for noise at work monitoring applications. The Stack Light is controlled by the XL2. It alarms at exceeding sound levels, thus employees near the test station are notified immediately.

Noise Exposure Level LEX,8h

The Noise at Work Directive 2003/10/EC reduces the risk of hearing damage for employees. The action limits are

  LEX,8h LCpeak  Action
Lower limit value 80 dB(A) 135 dB recommend wearing hearing protectors
Upper limit value 85 dB(A) 137 dB hearing protectors must be worn and noise level reduced where possible
Exposure limit 87 dB(A) 140 dB employee with hearing protectors shall never exceed these limits


Determination of Noise Exposure Level LEX,8h:

  • With a consistent noise level (applies when LAS deviation is < 5 dB)
    Measure the LAeq over a few minutes, the resulting LAeq represents the noise exposure level of the complete 8 hours period LEX,8h = LAeq. Where the daily exposure time T ≠ 8 hours, apply the following formula:
    LEX,8h = LAeq + 10 x log ( T / 8 hours )

  • With stepwise consistent level variations
    (applies to steady noise at clearly distinguishable levels)
    Measure the LAeq at the different levels and note the corresponding exposure time. Enter all data in the NTi Audio noise exposure level post processing form; the LEX,8h will be calculated and displayed.

  • For varying noise levels:
    LEX,8h = LAeq measured for 8 hours

Configuration

Exel Set for Noise Measurements

Exel Occupational Health Kit

including

  • XL2 Sound Level Meter
  • M4261 Measurement Microphone
  • ASD Cable for XL2
  • Mains Power Adapter
  • Exel System Case

Optional as required:
 

Extended Acoustic Pack

with additional features for sound level logging
 

Precision Calibrator

for microphone calibration
 

Stack Light

for visual (pre-) warning indication
 

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