Infield Gehoer 16-S GB - infield-safety

Phonor® Pro Filter
Phonor® Pro Filter
Tubular filter
•Customised hearing protection, 100% made in Germany
•2 acoustic filters with different characteristics
• Choice of 2 materials: acrylate and FlexComfort
•Available with or without cord
•Detector ball available for easy tracking when lost
• Filter is protected from dirt
• Field of use in industry
Pro M and Pro H – Both these filters are simple tubular filters that provide
good protection at medium and high frequencies. They are not suited for
use at low frequencies.
The Pro filters meet the simpler requirements in industrial uses.
There are two main methods to test the tight fit of customised hearing
protection: the (air) leakage test and the acoustic test. Please note that the
total attenuation is mainly a measure of the fit of the ear plug rather than the
actual function of the acoustic filter. The main difference is that seal integrity
tests are carried out for each ear (monaural) whilst the total attenuation is
measured for both ears at the same time (binaural).
If you require tests on your ear plug to confirm the high standard of our
products, INFIELD can carry these out for you at your request.
Procedure:
A small pump that has been developed specifically for this task increases the
pressure between the ear plug and the eardrum. The ear plug has a tight fit,
if the pressure doesn’t decrease.
Advantages:
• Quick and simple method
•No special facilities necessary
• Objective - does not rely on the test persons’ perception
Disadvantages:
• The cable connector can temporarily alter the fit of the ear plug and have
a negative influence on the test results
• The test environment should not be too loud as this can alter the test results
• Can not be applied to all ear plugs
The test is carried out with a micro processor, which is fitted with two microphones.
One of the microphones is connected to the ear plug and measures
the noise level behind the hearing protection (in front of the eardrum). The
other one measures the noise level in front of the hearing protection. After
applying the ear plug to the ear, a low frequency test sound is generated.
The difference in noise levels is the total attenuation.
Advantages:
• Precise measure of attenuation in dB
• Quick and simple method
• Objective - does not rely on the test persons’ perception
•No special facilities necessary
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Disadvantages:
• The test environment should not be too loud as this can alter the test results
Seal integrity test
(Air-) Leakage test
(Air-) Leakage test
Acoustic test
Acoustic test