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| DSH 752
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* C$ W* t/ g# k+ L6 I | Definition of a flame for glow wire test
5 v; @+ m |; c; C' X | 11-12
- h5 i) o; c1 r. P" m | 60695-2-11 & 60695-2-12 & 60695-2-13# n2 ~5 j( w& I! U9 _
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" A& U' z% ^0 j3 E( K! OStandard(s): No. Year' L: X3 K+ \, N) Y( m( Z
IEC 60695-2-11
* m' t \! m1 J5 o2 ] lIEC 60695-2-12
$ [' q7 a* T: ~2 IIEC 60695-2-13; x7 S4 F% I. C4 `* \
DSH 0752
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Category:
2 D: e# ~( [4 i. y" [/ R6 gVARIOUS - GENERAL9 C# h6 ?' v7 p+ A4 u, Q
Sub-clauses:2 Q, S- m0 T) ]( N' k# U2 Y
11 - 12
" W9 d C; \1 l7 i- @+ X. V' T" [/ HDeveloped by:" c$ v0 v; ^# m5 J" A
WG4 – WG2- ^: M$ u3 K" W: ]
Subject:
$ o7 F' i: ^* l w/ `Definition of a flame for glow
6 O, `/ Y7 E! Y# fwire test
( e) Y8 T; z7 m* bKey words:
8 s5 ~) r! l ]) I- Glow wire test
2 ^2 w- ]+ B5 \+ d0 I# {7 v; Y- Flame
# X, J' r4 Q0 t% V$ ?- Corona Effect
1 q7 C8 ?" D" B" U- o% A- Ionized gasses. Q' O3 [% q. t) e, x
- Ignition of the sample3 m# Y1 w& x9 ^/ r ?
Approved at the 47th CTL/ C, e8 R4 g A k' F
Plenary Meeting, year 2010.
, ~6 g. p* @# B2 k+ lQuestion:
3 q. `) _7 i ^1 w }& q, jHow is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?( f) \/ O8 q& K# ^
Decision:
7 s8 W. N! f& d& E+ i( q+ T4 VDuring the glow wire test (according to the temperature settings required by the standard), the; ^7 x3 \5 o* r
following phenomena can occur:" W) j; m; D {
1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a G6 H. }7 w4 z* ], z3 v' F# X
clear indication of an ignition. Some materials show a colourless transparent flame
9 [$ b* S6 [/ ]* j; cinstead of a bright shiny flame. This is considered to be ignition of the test specimen, if the
, }3 X, a) U4 fmaximum flaming time allowed by the standard is exceeded.. s0 [$ {% _8 ~$ ?+ v
2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture _. t' j; \6 G- g, h2 Z. h# A6 m
2. This corona consists of ionized gas, predominantly blue in colour and is located in the7 m/ M* v* n t: r% A6 h0 _
immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
" k5 [8 S f1 n% F$ ithe test specimen, as long as it does not lead to an ignition of the test specimen according
1 t+ W U- _- Dto point 1.5 q% j( d2 i; o2 n6 L, E
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture( x1 b4 s! r( S8 P! k% c/ ^; f+ r
3). This effect is also not considered to be ignition of the test specimen, as long as it does6 x$ X1 L H! [
not lead to an ignition of the test specimen according to point 1.
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