3M WORKTUNES (02) PDF Document

When worn properly, 3M WORKTUNES help reduce exposure to loud sounds produced during recreational activities, such as concerts, snowmobiling, or sporting events, and when using power tools and equipment such as drills, hand sanders, lawn mowers, garden tractors, and gas-powered leaf blowers/trimmers.

For very loud sounds, such as chain saws, circular saws, hammer drills, jack hammers, fireworks and gunfire, wearing earmuffs and earplugs at the same time is recommended for additional noise reduction.

Improper fit of this device will reduce its effectiveness. Fit your earmuff before entering a hazardous noise area following these instructions:

Place the earmuff on the head with the band at the crown (top) of the head.

Pull out the cups and place the hearing protector over your ears so that the ear cushions fit snugly.

It is important that the cups fully enclose the ears and that the cushions exert equal pressure around the ears.

Adjust the height of both cups for comfort and a good seal – do this by sliding the cup up or down while holding the headband in place.

For proper fit, ear cushions should seal firmly against the head.

Do not store the hearing protector at temperatures above 131°F or 55°C (for example, behind a windshield or in a window).

Anything that interferes with the seal such as long hair (pull back to the extent possible), thick or poorly fitting eyeglass temples, pencils or caps will lessen the earmuff’s effectiveness.

Do not bend and reshape the headband, as this will cause a loose fit and sound leakage.

The 3M WORKTUNES may be disassembled for cleaning.

Sponge clean with warm soapy water, and rinse thoroughly.

Do not use solvents.

Let the foam liner dry before re-inserting into ear cups.

Earmuffs must be regularly inspected for cracked or worn parts, and replaced as needed. Typical life for foam cushions is six months.

The Sound Pressure Level (SPL) of the 3M WORKTUNES is limited to 82dB using ordinary music material when connected to a Personal Music Player (PMP).

If the 3M WORKTUNES are connected to a PMP or other device with a very high output level, it is the users responsibility to set the Sound Pressure Level to a safe level.

The electrical input level for which the mean plus one standard deviation A-weighted diffuse-field related to sound pressure level for the sixteen ears is equal to 82 dBA is 83 mV.

The NRR for 3M WORKTUNES is 24 dB. Improper fit of this device will reduce its effectiveness in attenuating noise.

Research suggests that many users will receive less noise reduction than indicated by the NRR due to variation in earmuff fit and wearing time. It is recommended to reduce the NRR by 50% for estimating the average amount of noise reduction provided.

The following table details the Attenuation (ANSI S3.19 – 1974):

The level of noise entering a person’s ear when a 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.

2. The NRR is 24 decibels (dB).

3. The level of noise entering the ear is approximately equal to 68 dB.

For noisy environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level should be used.

If there is any drainage from your ear or if you have a hole in your eardrum, consult with your physician before wearing hearing protection.