If you need noise survey assistance as discussed in this article call us at 1-800-344-4414 or email us at firstname.lastname@example.org for details and a free estimate.
Written by Robert E. Sheriff, MS, CIH, CSP, President
Noise Dosimetry Surveys
October 23, 2018
Whether they are subjected to a constant din or sporadic bursts of loud sounds throughout the day, employees in noisy workplaces are at risk of permanent damage to their hearing. For a noisy workplace, establishing a Hearing Conservation Program is imperative to protecting both employee health and employer liability.
Where to start? Sometimes, determining the appropriate type of protection for each employee can be tricky, because individual employees may have varying levels of exposure to different sounds throughout the day. The best way to determine the volume, frequency, and length of noise exposure to each employee—or employee function—is through a noise dosimetry survey or noise testing/sampling.
A noise dosimeter is a small, unobtrusive meter that attaches to a worker’s belt, connected to a tiny microphone that clips on their collar, next to their ear. The device is worn throughout an entire 8-hour shift, measuring sound at ear level, and determining the average exposure level per shift for that individual.
New technology has minimized the noise dosimeter so that now some are so small they can be worn on the collar.
Note that a noise dosimeter is not a recorder but only a sound level meter that takes a reading at ½ to 1-second intervals and accumulates the measurements over the time-worn by the worker. The accumulated noise levels are compared to OSHA limits, or other recommended safe noise exposure limits.
Each factory has unique characteristics, employees and processes. Each factory also has federal, state and local regulations to consider. An experienced industrial hygienist is able to choose the appropriate noise dosimeter to be used, calibrate it before and after use, and provide results in a clearly written and comprehensive report.
Based on the results, a Hearing Conservation Program can be developed or modified. Noise dosimetry surveys provide employers with the information needed in order to require workers to wear the most effective and least disruptive personal protective equipment designed for each specific function.
An important complement to noise dosimetry is to develop a noise map of the work area. This will identify noisy areas that can be the target of noise reduction efforts should OSHA compliance be an issue. The noise map is developed with a handheld sound level meter (SLM). A qualified person such as an Industrial Hygienist can measure the noise throughout the facility. If there is a need for noise reduction, an octave hand analyzer can identify the specific frequencies that are excessive so that some engineering efforts can be implemented to achieve noise reduction.
Robert E. Sheriff is the CEO of Atlantic Environmental. A Certified Industrial Hygienist and Certified Safety Professional, he has over forty years of experience providing industrial hygiene and occupational safety services, including designing and conducting noise dosimetry surveys or noise dosimetry testing in a wide variety of industrial settings. To discuss your particular needs and obtain a complimentary proposal, contact him at 800-344-4414 or email him at email@example.com.
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