Sound Pressure Level Measurements - Cebora Plasma PROF 166 HQC Instruction Manual

5.3 SOUND PRESSURE LEVEL MEASUREMENTS

Plasma cutting generates noise levels that can damage the human ear; therefore, operators must wear adequate pro-
tective equipment, such as a headset or earplugs, in conformity to national or local regulations.
The measurements shown in the following table, referring to mild steel and taken at the specified distances, can help
the safety supervisor adopt all of the means required to make the workplace safe (for example, see international stan-
dard IEC 60974-9).
Cutting
Material
gas
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
Mild Steel O2/air
The measurements lasted 1 minute each and were conducted in a closed, reverberant room at CEBORA S.p.A. labo-
ratories.
The data do not consider any corrections due to background noise or to the dimensions of the test room.
A-weighted and peak-C sound pressure levels are defined by international standards (see IEC 11202 and IEC 61672-1).
Cutting
Thickness
current
(mm) (A)
25 120
25 120
25 120
40 250
40 250
40 250
50 400
50 400
50 400
Measurement
distance
Cutting
(opposite source
speed
x
above source)
(m/min) (m x m)
0.4 1 x 0.5
0.4 2 x 0.5
0.4 3 x 0.5
0.5 1 x 0.5
0.5 2 x 0.5
0.5 3 x 0.5
0.8 1 x 0.5
0.8 2 x 0.5
0.8 3 x 0.5
Peak C-
A-weighted
weighted
sound
sound pressure
pressure level
level
(dB)
105.0 119.7
100.5 114.6
99.2 113.3
111.9 125.0
108.1 121.6
106.5 120.3
114.2 129.5
108.9 124.1
107.1 122.9
(dB)
69