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[Various] DSH 752 Definition of a flame for glow wire test

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发表于 2012-11-8 19:48 | 显示全部楼层 |阅读模式
广东安规检测
有限公司提供:
DSH 752/ s9 m7 y0 K$ n" q" A/ @5 Z5 K

* B6 h7 X, u/ X% a5 V
Definition of a flame for glow wire test
) j& \& _1 T- Q) I* ]3 i' p5 L5 v+ R
11-12' I7 t. ~1 F0 ]8 [
60695-2-11 & 60695-2-12 & 60695-2-13) F; y1 M+ l* d& {! P5 A; `# W. K* W
) X' c# Y) J6 v
Standard(s): No. Year
* s& K; j+ t4 r0 r8 ]9 xIEC 60695-2-11
: K, E9 f, `, b% @# |5 BIEC 60695-2-12
8 w% R! Y( Y: |IEC 60695-2-13
+ V% Q$ r* O9 F4 s5 LDSH 0752
0 c7 s: T9 K  S9 ^* a0 R. J3 W2009
$ N0 e/ G5 B5 @" h. oCategory:( r" K" p# |  P% O
VARIOUS - GENERAL
, ^8 q4 V! y5 l+ ^; PSub-clauses:! _6 S' j% W$ _+ d, f( O1 f
11 - 126 R2 @& Z$ y. r, _8 ~/ H3 K6 |' x0 r
Developed by:
0 Q- w0 \; x) g( {5 Z$ ^% ~' |WG4 – WG2( |0 z* J/ s$ Q( W( w2 Q8 T" }
Subject:
- \8 s4 p8 ?3 H0 A5 `8 dDefinition of a flame for glow
0 X5 v1 l; R. b. m/ U/ ]: Nwire test+ P1 V2 j! E6 y
Key words:; m4 E& i: B! l
- Glow wire test
/ Y' g) \+ W- ~4 p# J" R0 B- u8 x- Flame' {# S+ K4 J/ B  ~
- Corona Effect
; h8 L. d" i9 h% `$ @- Ionized gasses. Q! x/ p3 u; w% m0 Q
- Ignition of the sample
! _0 K+ y: i) ], ~: YApproved at the 47th CTL
& G5 t4 _2 ^0 V. c+ C7 WPlenary Meeting, year 2010.# e/ _/ w- Q- F) m
Question:
/ O$ ^; K$ c# f9 o8 F* yHow is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?
% d/ g- r9 q; jDecision:2 K+ q+ y+ v& \/ B# |4 L& S* P
During the glow wire test (according to the temperature settings required by the standard), the8 k8 E1 Q: }) |4 j1 i' z# O
following phenomena can occur:/ M% q' B% }) s% [: n
1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a' C" _- w6 S# ^1 o- v
clear indication of an ignition. Some materials show a colourless transparent flame; V: @3 m- b( w  Y
instead of a bright shiny flame. This is considered to be ignition of the test specimen, if the
3 O+ R  K" {. J. _9 o( Tmaximum flaming time allowed by the standard is exceeded.
8 {4 I% T( M& y4 ]$ w2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture
" C2 O9 d6 J3 @+ l7 U* {2. This corona consists of ionized gas, predominantly blue in colour and is located in the
: W: K2 J+ ?8 q0 Bimmediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
# [7 T& l+ y6 g' W  F7 Y' }the test specimen, as long as it does not lead to an ignition of the test specimen according
) w4 p! K4 i' Z. V, B3 l3 `2 ^to point 1.8 W; h7 A: ^4 P' K& D( m
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture) P8 [. w, {5 y5 N
3). This effect is also not considered to be ignition of the test specimen, as long as it does( A) S# \4 H1 ~3 a% J4 s( E
not lead to an ignition of the test specimen according to point 1.
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2 `% N9 d) w# C  ^. ~

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