The CEL632A has many applications but is primarily intended for the detailed analysis of noise in the workplace.
The occupational noise regulations around the world usually specify or recommend the use of an Integrating sound level meter as this removes the potential error when trying to average it by eye.
The CEL632A takes this one step further, offering a detailed Time History store that provides graphs of the sound level against time. The meter can be left in a noisy environment and downloaded later. The graphs clearly show the noisier and quieter times of day, making the planning of a worker's noise exposure possible.
The OSHA occupational noise regulations state that you should use at least a Type 2 Sound Level Meter. The meter should be verified by a suitably equipped laboratory when new and we recommend having it checked at least every two years. You also need a Calibrator to check the meter's function before making measurements.
An Integrating meter like the CEL632 provides you with the measurement of the average Slow sound level - Lavg. Rather than trying to average the sound level by eye (made more difficult by the logarithmic nature of noise), the meter does the averaging for you. The Lavg is then used to calculate the worker's Time Weighted Average (TWA) noise exposure.
Hearing Protection Assessment
When the noise levels are particularly high (e.g. greater than 95 dBA) then you should check that the hearing protection provided is adequate. If it does not reduce the noise at the ear to an acceptable level then clearly it is not adequate. The CEL632A measures both the A and C weighted sound level, so you can use the NRR or HML method - for a working example of NRR and HML methods please take a look at our Hearing Protection Calculator.
For extremely high noise levels or high tonal content, Octave Band analysis may be required. In this case the CEL632B Octave Band Sound Level Meter would be a better choice.
Unattended noise measurement is convenient but causes problems when the time comes to identify the source of the noise. Was it a piece of machinery, a steam leak, a vehicle passing or somebody shouting. The CEL632 can record the audio so that you can listen to the interesting bits, enabling you to make a positive identification of the noise source.
Please visit the Voice Notes and Audio Recording page for more details.
As the CEL632A is available as either Type 1 or Type 2 and includes data logging, it is suitable for many environmental noise surveys.
However, for environmental work we would recommend the CEL633A Environmental Sound Level Meter, which includes the statistical parameters (L10, L50, L90, etc.) that are often required. The CEL633 also includes the Time History and automatic timers for longer term environmental noise monitoring.
The Type 2 sound level meter is available alone or as part of a Kit, which includes Meter, Calibrator and Carrying Case.