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The marking found on the lower front section of the TW-VISION3 model filter is composed of a series of symbols with the following meanings:
light scale number of the filter
lightest dark scale number of the filter
darkest scale number of the filter
manufacturer's symbol: TELWIN – ITALY
Optic class
light diffusion class
light transmission factor variation class
light transmission factor angular dependence
numerical standard of legislation referenced when requesting certification
CE marking
The marking found on the top front section of the TW B CE external cover plate is composed of a series of symbols with the
following meanings:
manufacturer's symbol: TELWIN – ITALY
symbol of the medium energy impact
CE marking
The marking found on the top front section of the TW 1 B CE internal cover plates is composed of a series of symbols with the following meanings:
manufacturer's symbol: TELWIN – ITALY
optical class
symbol of the medium energy impact
CE marking
The certification procedure indicated in Art. 10 of the Directive 89/686/EEC was carried out by DIN CERTCO Gesellschaft für Konformitätsbewertung mbH,
Alboinstraße 56 D-12103 Berlin. Notified body of the European Commission (identification code 0196).
TAB. 1
Welding process
and related technics
Coated electrodes
MAG
TIG
MIG on heavy metals (*)
MIG on light alloys
Air-arc cutting
Plasma-jet cutting
Microplasma arc welding
(*) The term "Heavy metals" refers to steel and its alloys, copper and its alloys.
Numbers of shades and uses recommended for arc welding
1.5
6
10
15
30
40
8
8
8
10
4
5
6
1.5
6
10
15
30
40
Amper Current
60
70 100 125 150 175 200 225 250 300 350 400 450 500 600
9
10
11
9
10
9
10
11
9
10
10
9
10
11
7
8
9
10
60
70 100 125 150 175 200 225 250 300 350 400 450 500 600
- 3 -
3 / 4-8 / 8-12 TW 1 / 1 / 1 / 1 / 379 CE
TW B CE
TW 1 B CE
12
13
11
12
12
13
11
12
11
12
13
11
12
13
12
13
11
12
14
13
14
13
14
14
14
15
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