2
EN
•
Always use product-specific 3M replacement parts. Use of
unauthorized replacement parts may reduce the protection you
receive from this product.
• Obey the instructions given in this manual.
Tampering with the product may void the
IP54 approval of this product.
NOTE
• When worn according to these User Instructions, this
hearing protector helps reduce exposure to both continuous
noises, such as industrial noises and noises from vehicles and
aircraft, as well as very loud impulse noises, such as gunfire. It
is difficult to predict the required and/or actual hearing
protection obtained during exposure to impulse noises. For
gunfire, the weapon type, number of rounds fired, proper
selection, fit and use of hearing protection, proper care of
hearing protection, and other variables will impact performance.
To learn more about hearing protection for impulse noise, visit
www.3M.com.
• Although hearing protectors can be recommended for
protection against the harmful effects of impulsive noise, the
Noise Reduction Rating (NRR) is based on the attenuation of
continuous noise and may not be an accurate indicator of the
protection attainable against impulse noise, such as gunfire.
• In Canada, users of hard hats combined with earmuffs must
refer to CSA Standard Z94.1 on industrial protective headwear.
This portable device with its antenna complies with
FCC/ISED RF Exposure limits for general population /
uncontrolled exposure. The antenna used for this device must
not be co-located or operating in conjunction with any other
antenna or transmitter. Changes or modifications to the
equipment not expressly approved by the party responsible for
compliance could void the user’s authority to operate the
equipment.
• Operating temperature range: –20°C (–4 °F) to 55 °C
(131 °F)
• Storage temperature range: –20 °C (–4 °F) to 55 °C
(131 °F)
• Weight of hearing protector: 435–470 g
LABORATORY ATTENUATION
The attenuation rating NNR was obtained with the device
powered off.
USA Standard ANSI S3.19-1974
U.S. EPA specifies the NRR as the measure of hearing
protector noise reduction. However, 3M makes no warranties
as to the suitability of the NRR for this purpose. 3M strongly
recommends personal fit testing of hearing protectors.
Research suggests that users may receive less noise
reduction than indicated by the attenuation label value(s) on
the packaging due to variation in fit, fitting skill, and motivation
of the user. Refer to applicable regulations for guidance on
how to adjust attenuation label values. It is recommended that
the NRR be reduced by 50% to better estimate typical
protection.
Explanation of attenuation tables:
A:1 Frequency (Hz)
A:2 Mean Attenuation (dB)
A: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 dBA.
2. The NRR is 27 decibels (dB).
3. The level of noise entering the ear is approximately equal
to 65 dB(A).
CAUTION:
For noise environments dominated by frequencies below 500
Hz the C-weighted environmental noise level should be used.
When selecting accessories to respiratory personal protective
equipment, such as hard hat mounted hearing protection,
please consult the NIOSH approval label or consult 3M
Technical Services for approved configurations.
COMPONENTS
Headband
MT73H7A4610WS6NA, MT73H7A4610NA
(F:1) Headband
(F:2) Headband padding (PVC foil)
(F:3) Headband wire (stainless steel)
(F:4) Two-point fastener (POM)
(F:5) Cushion (PVC foil and PUR foam)
(F:6) Foam liner (PUR foam)
(F:7) Cup
(F:8) Microphone for level-dependent function for ambient
listening
(F:9) Speech microphone (dynamic microphone)
(F:10) On/Off/Mode button
(F:11) + button
(F:12) – button
(F:13) Antenna
(F:14) Speech microphone input (J22)
(F:15) Bluetooth
®
button
(F:16) PTT (Push-To-Talk button) for built-in communication
radio
(F:17) External input/output (e.g. for external communication
radio, external telephone)
(F:18) Lithium-ion battery (rechargeable)
Neckband
MT73H7B4610WS6NA, MT73H7B4610NA
(F:19) Neckband wire (stainless steel)
(F:20) Neckband cover (PO)
Helmet attachment
MT73H7P3E4610WS6NA, MT73H7P3E4610NA
(F:21) Cup supporting arm (stainless steel)
