John Pratt
04-11-2013, 1:37 PM
Previously I posted the sound level readings from many of the different tools around the shop using a dosimeter reading dBA for for those different tools. See: http://www.sawmillcreek.org/showthread.php?200942-Noise-level-readings-in-the-shop
I promised to report the findings of the most recent readings from wearing a personal dosimeter around the shop for three days for those who might find it intriguing in the interest of hearing conservation.
Caveat: I am not a hearing conservation specialist. The reading and numbers listed below are how the hearing conservationist expliained them to me.
NOTES:
1. All reading are weighted on the "A" scale.
2. The criterion noise level (maximum allowable accumulated noise exposure) measured using the OSHA hearing conservation amendment action level of 85dBA for 8 hours
3. LAVG = Average sound level measured over the run time
4. TWA = Time weighted average (figuring an 8 hour run time)
5. Location peak reading = highest reading during the time measured
6. Dose level = using the OSHA criterion level
7. Projected dose = figuring that the noise levels are experienced for a full 8 hour period.
Day 1:
Time measured - 6 hours
LAVG - 92.9dBA
TWA - 91.7dBA
Location peak reading - 141.2dBA
dose level - 473.3%
projected dose - 622.9%
Day 2:
Time measured - 6 hours
LAVG - 84.4dBA
TWA - 82.9dBA
Location peak reading - 134.2dBA
Dose level - 62.4%
Projected dose - 88.4%
Day 3:
Time measured - 6 hours
LAVG - 83.6dBA
TWA - 82.2dBA
Location peak reading - 125.8dBA
Dose level - 53.3%
Projected dose - 74.1%
Overall assessment: WEAR HEARING PROTECTION!!
I promised to report the findings of the most recent readings from wearing a personal dosimeter around the shop for three days for those who might find it intriguing in the interest of hearing conservation.
Caveat: I am not a hearing conservation specialist. The reading and numbers listed below are how the hearing conservationist expliained them to me.
NOTES:
1. All reading are weighted on the "A" scale.
2. The criterion noise level (maximum allowable accumulated noise exposure) measured using the OSHA hearing conservation amendment action level of 85dBA for 8 hours
3. LAVG = Average sound level measured over the run time
4. TWA = Time weighted average (figuring an 8 hour run time)
5. Location peak reading = highest reading during the time measured
6. Dose level = using the OSHA criterion level
7. Projected dose = figuring that the noise levels are experienced for a full 8 hour period.
Day 1:
Time measured - 6 hours
LAVG - 92.9dBA
TWA - 91.7dBA
Location peak reading - 141.2dBA
dose level - 473.3%
projected dose - 622.9%
Day 2:
Time measured - 6 hours
LAVG - 84.4dBA
TWA - 82.9dBA
Location peak reading - 134.2dBA
Dose level - 62.4%
Projected dose - 88.4%
Day 3:
Time measured - 6 hours
LAVG - 83.6dBA
TWA - 82.2dBA
Location peak reading - 125.8dBA
Dose level - 53.3%
Projected dose - 74.1%
Overall assessment: WEAR HEARING PROTECTION!!