1.1 Values for extraction connection
Volume flow for connection Ø 35 mm: 70 m
3
Vacuum pressure present
for an air speed of 20 m/s: 1666 Pa.
The dust emissions measured according to the principles
for testing dust emission (workplace-related dust
concentration) from woodworking machines by the Trade
Association for Wood lie clearly below the applicable limit
value o 2,0 mg/m
3
.
1.2 Noise emission
Measurement conditions:
- prEN 31202 for workplace-related emission values
w
ith the following additions established by TC 142 in
order to obtain an accuracy class of better than 3 dB:
- The ambient correction factor K2A or K3A is < 4 dB.
- The difference between external noise level and the
noise sound pressure level is < 6 dB for each
measurement point.
- K3A is calculated according to appendix A, prEN 31204.
- A square envelope surface with nine measurement
points at a distance of 1 m from the reference surface
was used.
Workpiece: spruce
- Dimensions 150 / 100 / 20 mm (planed all round).
Tool: Fretsaw blade
- Dimensions t = 1.5 mm, b = 1 mm.
- The noise level emitted amounted to:
Sound pressure level at workplace [dB (A)]
Idling: 64.1
Cutting: 74.5
A measurement uncertainty supplement of K = 4 dB (A)
applies to the said emission values.
The values given are emission values and therefore do not
necessarily equate to safe workplace values. Although
there is a correlation between emission and immission
levels, it cannot be reliably deduced whether or not
additional precautionary measures are required. Factors
which can influence the immission level present at the
workplace at any time include the duration of effect, the
nature of the workplace, other noise sources etc., e.g. the
number of machines and other adjacent processes. The
reliable immission level may also vary from country to
country. This information should however enable the user
to make a closer assessment of the risk and danger.
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