in Noise
AIHce Exhibitors Demonstrate Leading Technology
Occupational Health Dynamics (OHD)
OHD’s Optimus is the latest sound level meter in the Cirrus Research line. The Optimus’ key design
concepts include simple operation that measures all parameters simultaneously over a single 120dB
span. “These concepts, combined with 4GB of memory and a 3-button start, means using the Opti-
mus gives you every measurement, every time,” says Jeff Griggs, OHD’s manager of noise instrumen-
tation. “The outcome gives you more reliable results with less training.”
The Optimus takes advantage of the latest in display technology by using a large, high-resolution, OLED
color display with an ambient light sensor. The OLED display automatically adjusts contrast for optimal
viewing in all lighting conditions. The Voice Tag feature allows users to record an audio note with each
measurement, eliminating the need to do pen-and-paper surveys. The Optimus also has an integrated
threshold-triggered audio recording option that helps users identify offending noise sources during environ-
mental surveys. According to Griggs, users especially like the feel of Optimus’ small, ergonomic design.
Phonak
Industrial hygienists seeking effective hearing protection devices (HPDs) confront the choice between
generic and custom earplugs. According to Phonak’s Managing Director, Helmut Ermann, recent tech-
nological advances have made custom earplugs more desirable. “There are several critical issues sur-
rounding generics that have a negative impact on results, including under protection, over protection,
and lack of compliance,” Ermann says. “Any and all of these factors can and do lead to employees re-
moving their hearing protection.”
The custom approach addresses these issues with increased comfort, ease of use, and less user-
related variability, Ermann says. During AIHce 2011, Phonak presented custom-molded Serenity
eShells, which are constructed with medical-grade nylon material and manufactured using a digital
3-step process. Serenity eShells provide users with the same benefits as soft silicone. Added benefits
include appropriate attenuation, verifiable with objective individual fit verification measurement; modular
design; and choice of static or dynamic technology.
The eShell material is guaranteed for five years. According to Phonak, an upfront investment in
eShells will be recovered in approximately 18 months and that significant savings will be realized in
years 2 through 5.
Silvent
Noise associated with compressed air blowing can easily be addressed and result in large reductions
in sound levels. According to Silvent, installing its specially designed air nozzles will reduce noise levels by 10 dB(A) or more.
Blowing compressed air through an open pipe or copper tube creates turbulent, high frequency
sound levels, and is an inefficient use of energy. Silvent nozzles are engineered with small, multi-ori-fice outlet ports designed to increase the velocity of the compressed air and reduce air turbulence.
Reducing air turbulence, says Silvent General Manager Keith Timmons, is fundamental to eliminating
high frequency sound levels, and the high-velocity compressed air entrains surrounding air for improved blowing force and coverage.
When selecting a nozzle suitable for your application, Silvent evaluates several factors including
sound level, blowing force, air consumption, blowing coverage, safety concerns, and speed and
space limitations specific to the application. Proper mounting and installation of the air nozzle is also
important for achieving maximum reductions in sound levels. All Silvent nozzles meet OSHA safety directives. For more information, visit silvent.com.
June/July 2011 ; The Synergist
