Daily Personal Exposure Level - LEP,d or LEX,8hr
| The LEP,d is a worker's daily exposure to noise
at work (normalised to an 8 hour day), taking into account the average
levels of noise the time spent in each area. This
is the parameter that is used by the Noise at Work Regulations and
is essential in assessing a workers exposure and what action should
be taken. |
Noise Exposure
Calculators |
How to Get the LEP,d / LEX,8hr
It is not quite so daunting as it looks. The HSE book Guidance on the
Noise at Work Regulations gives a good description of how to calculate
the LEP,d. By far the easiest ways are:
Despite first appearances, the nomogram method is
quite simple. The sound level (usually A weighted Leq)
is measured using a sound level meter. Using a ruler you make a
line between the measured level and the time that the worker is
exposed for. The LEP,d value is the point at which the line crosses
the LEP,d bar.
When a worker is going to be moving between different locations,
a fractional exposure is obtained in a similar way at each location.
The overall LEP,d can then be calculated. |
Click for Example |
The data logging instruments such as the CEL244 and CEL620 come with
software that calculates the LEP,d for you. This is particularly useful
when a worker is moving between different locations.
For workers moving between many locations it can be more convenient
and often more accurate to use a noise dosemeter like the dBadge.
Dosemeters mount on the worker, measuring the noise exposure throughout
the day and calculating to LEP,d for you.
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