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| DSH 752
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$ Q! W, v2 T3 a# I$ G | Definition of a flame for glow wire test2 Y8 p/ A& e" U7 G9 Y( V% q
| 11-12& A3 A+ S7 h; l
| 60695-2-11 & 60695-2-12 & 60695-2-13
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# F& U/ I$ X0 I' F; IStandard(s): No. Year+ G: k1 a' q5 x# K
IEC 60695-2-11" m1 Q, P7 G7 |0 S5 p
IEC 60695-2-12; l! |6 u- U* Q1 T* a! U2 d+ J S
IEC 60695-2-13
. k1 H" n, w9 U- x6 iDSH 0752
]0 J7 T; X# p. }7 @ z: d2009# a0 e0 ~- N Q3 M, i! P$ s' n& n
Category:5 c B) ?7 h- G5 D% B2 ?5 {
VARIOUS - GENERAL
4 J+ T, @% R9 W5 pSub-clauses:: J) Q& x% M F1 t! C
11 - 12
, U! M7 y' W% N# g% iDeveloped by:" |, z% _7 w5 B
WG4 – WG2
( B/ T+ w/ W* q: Z$ ?Subject:. Q6 L* L) r/ u1 F5 H
Definition of a flame for glow
5 n2 R( {. a7 F. M" g" Z. P, k1 Dwire test7 T1 J* V+ M& i! x) s9 s
Key words:
0 Y z4 U& r8 r' s( m7 E% n: D- Glow wire test: L% \$ q8 D8 k! A) N7 V2 f
- Flame! I1 W6 h& M5 ?) |" b$ k* g
- Corona Effect: n9 B7 \+ P( q, o
- Ionized gasses
( n/ _+ m4 O9 O5 W- Ignition of the sample- b% e$ A: k" T5 m$ s; u! y
Approved at the 47th CTL
; k3 O! O9 g5 |0 N& ^- KPlenary Meeting, year 2010.
; ^4 ~* F$ ?$ V$ }Question:9 F3 y+ @: Z: y4 y- o
How is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?
) H% Q+ f" M$ O; f2 uDecision:
3 r/ _$ k9 A2 D5 g8 l" ODuring the glow wire test (according to the temperature settings required by the standard), the! S( O4 Y. I% P" K
following phenomena can occur:
! y5 j3 k2 \* o& k B, _1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a6 R! B1 n7 o4 n$ K2 b
clear indication of an ignition. Some materials show a colourless transparent flame
7 M4 X' L1 d! F# ?instead of a bright shiny flame. This is considered to be ignition of the test specimen, if the2 p5 y" c& p" |# }/ Z& o
maximum flaming time allowed by the standard is exceeded.3 S l9 Z: p+ w
2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture9 E' c2 B, n. b% x+ G! {
2. This corona consists of ionized gas, predominantly blue in colour and is located in the5 [( y' M; y* {
immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
S& T3 A( j. a. ~the test specimen, as long as it does not lead to an ignition of the test specimen according1 H8 w! `2 t6 r
to point 1.* P% A; r' |5 W/ Q- |8 R+ R
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture
* t& c- L- F5 m `% o3). This effect is also not considered to be ignition of the test specimen, as long as it does
7 v4 n* u/ G0 ^; G* M1 Nnot lead to an ignition of the test specimen according to point 1.
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