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|  DSH 752
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| Definition of a flame for glow wire test
. m) p: H* a( B3 q- b | 11-12% F+ w% k- Y7 r8 v& n7 ^ N
| 60695-2-11 & 60695-2-12 & 60695-2-13$ [: A9 }: T# o* s8 l4 B) ]8 t
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Standard(s): No. Year4 h6 F8 x0 M/ c- @' J7 [/ I1 }: E
IEC 60695-2-119 L/ _# @, g% {0 d9 M+ A
IEC 60695-2-12' _8 m% W. ~' i5 q0 c1 u
IEC 60695-2-13
4 z: |! ]$ b+ M" l! f' }3 YDSH 07526 R) z* t$ x5 V/ ]- h/ Y7 u/ D& B/ h
2009
% m6 e7 ]2 h% e; P7 `) ?- ZCategory:
5 `2 q' C" F; n' \" qVARIOUS - GENERAL
' p; N- a7 m; C$ e: [# T7 CSub-clauses:
, w# e& w! G2 \) Z m$ ^1 y11 - 12
% g; y4 w9 l9 \( [' F! z2 vDeveloped by: y; e2 ]5 n7 i1 k( G; g* u* u; \
WG4 – WG2
( b/ b3 w( H% }. @: `1 X0 zSubject:
1 v7 |' X- X4 R- ODefinition of a flame for glow8 U/ w3 S, M y% ~/ \5 \
wire test( i4 G& V2 O" K a7 E+ ]
Key words:
6 ^# y5 b# @) E. f" t( j( E- Glow wire test
( x' ?- C: x g' l% @- Flame
" K5 D* {) k+ d/ ^8 j- Corona Effect
% T+ D1 Q( _! m2 K" K2 {" A1 k- Ionized gasses9 G" p: B% J6 x
- Ignition of the sample
; X- y! f4 v" g2 F. `/ ]Approved at the 47th CTL: q l, F) {& G( d3 L+ K
Plenary Meeting, year 2010." }5 X6 X* B I' @2 `$ B9 Q6 V' y7 y
Question:/ ?! o5 }, E6 C' s
How is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?
9 p" I* ^! J+ j3 O% `0 Z' Z: ZDecision:9 ]4 b! p8 R! U) S# X( d. Z8 ?5 G
During the glow wire test (according to the temperature settings required by the standard), the- f4 i8 q8 N1 i7 v& A
following phenomena can occur:
3 `5 b" v( H4 a+ \1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a
1 U9 O5 f. k- T! U" Q2 _. N% uclear indication of an ignition. Some materials show a colourless transparent flame
. {6 e: K+ M, X$ Winstead of a bright shiny flame. This is considered to be ignition of the test specimen, if the( F' F; M2 p) X4 f8 k
maximum flaming time allowed by the standard is exceeded.7 B( U7 t. J+ t
2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture8 w* h% a4 T" j- }: ^3 C
2. This corona consists of ionized gas, predominantly blue in colour and is located in the5 J' c" k: s! n' l
immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
$ k# m5 d# o. C. s% D5 hthe test specimen, as long as it does not lead to an ignition of the test specimen according8 Y ?8 x5 Z( S
to point 1.) y7 y+ p8 W6 A+ ?& a! k
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture+ j* ^' K# I2 y+ ?
3). This effect is also not considered to be ignition of the test specimen, as long as it does
/ r" [' i3 ^4 Knot lead to an ignition of the test specimen according to point 1.' T7 y1 k. J6 a U4 l
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