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L = Hearing protection estimation for low frequency
sounds (ƒ ≤ 500 Hz).
(E) Criterion level
H = Criterion level for high frequency noise
M = Criterion level for medium frequency noise
L = Criterion level for low frequency noise
USA Standard ANSI S3.19-1974 (Table B)
3M strongly recommends individual fit testing of hearing
protectors. If the NRR or SNR is used to estimate typical
workplace protection, 3M recommends that the noise
reduction value be reduced by 50% or in accordance with
applicable regulations.
(B:1) Frequency (Hz)
(B:2) Mean attenuation (dB)
(B:3) Standard deviation (dB)
The level of noise entering a person's ear, when hearing
protector is worn as directed, is closely approximated by the
difference between the A-weighted environmental noise level
and the NRR.
Example
1. The environmental noise level as measured at the ear is
92 dB(A).
2. The NRR is 32 decibels (dB).
3. The level of noise entering the ear is approximately equal
to 60 dB(A).
Australia/New Zealand Standard AS/NZS 1270:2002
(Table C)
(C:1) Test frequency
(C:2) Mean attenuation
(C:3) Standard deviation
(C:4) Mean minus SD
Explanation of electrical audio input level (Table D)
European Standard EN 352-6
(D:1) Input signal level U (mV, RMS)
(D:2) Mean sound pressure level (dB(A))
(D:3) Sound pressure standard deviation (dB)
(D:4) Input signal level for which the mean plus one standard
deviation equals 82 dB(A)
Explanation of criterion levels (Table E)
European Standard EN 352-4
Criterion level is the sound pressure level in dB(A) of the
noise environment resulting in 85 dB(A) effective to the ear
while wearing the hearing protectors. Three different criterion
levels are defined related to the frequency content of the
noise.
H = criterion level for high frequency noise.
M = criterion level for medium frequency noise.
L = criterion level for low frequency noise.
Explanation of the industrial safety hard hat attachment
(Table F)
European Standard EN 352-3
(F:1) Helmet manufacturer
(F:2) Helmet model
(F:3) Helmet attachment
(F:4) Head size: S = Small, M = Medium, L = Large
NOTE: These earmuffs should be fitted to, and used only with
the industrial safety helmets listed in Table F. These earmuffs
were tested in combination with the following industrial safety
hard hats, and may give different levels of protection if fitted
to different hard hats.
NOTE: When selecting accessories, such as headgear-
mounted hearing protection, please consult the NIOSH
approval label or consult 3M Techinal Service for approved
configurations.
COMPONENTS
(G:1) Headband (PVC, stainless steel)
(G:2) Two-point fasteners (POM)
(G:3) Ear cushion (PVC foil, PUR foam)
(G:4) Speech microphone
(G:5) On/Off/Mode button
(G:6) [+] button
(G:7) [–] button
(G:8) Bluetooth
button
®
(G:9) External input PTT (*-111 models)
(G:10) External input jack, FLX 2
1. FITTING INSTRUCTIONS
1:1 Headband
(H:1) Slide out the cups and tilt the top of the cup out, as the
cable must be on the outside of the headband.
(H:2) Adjust the height of the cups by sliding them up or down
while holding the headband in place.
(H:3) The headband should be positioned across the top of
your head.
1:2 Neckband
(J:1) Place the cups in position over the ears.
(J:2) Keep the cups in position, place the head strap on top
of your head and lock it tight in position.
(J:3) The head strap should be positioned across the top of
your head and should support the weight of the headset.
1:3 Helmet attachment
(K:1) Insert the helmet attachment in the slot on the helmet
and snap it into place.
(K:2) Make sure that the cable is on the outside of the
headband.
(K:3) Work mode: Press the headband wires inwards until
you hear a click on both sides. Make sure that the cups and
the headband wires do not press on the edge of the helmet
when in work mode as this can cause noise leakage.
(K:4) Ventilation mode: Avoid placing the cups against the
helmet as this prevents ventilation (K:5).
NOTE: Do not store the helmet with the helmet attachment in
ventilation mode. This causes stress on the helmet attachment.
NOTE: When the helmet is not in use, make sure that the
cups are left in work mode. This will decrease the stress on
the helmet attachment.
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