, {& B5 E* c" v+ A3 l4 X) ~Standard(s): IEC 60112/2003 No. Year( j3 }+ E8 ^" C6 ]# Y
Ed. 4.0 : S- l8 S4 v: `: }4 ^DSH % y- \ E7 Q+ C- U9 ^0 d- a0724/ _/ C: _9 S/ G; r
20089 r6 N2 s/ X" K$ s: r
Categories: Various, General9 M0 q' m2 e5 H+ d
Subclause(s): 7.3: e6 J: B2 p2 C( }
Developed by: WG4( E5 k! d1 c1 X3 e* m, o+ q. k
Subject: Measurement of $ A8 G) S9 U2 A* j# V, dconductivity ( |( a! \& ^' \5 Z5 C# ~2 HKey words: + K9 B: ~, B3 s3 H/ X+ [$ U; b- Tracking solution$ j3 g. q- ^3 ~: E% H
- Conductivity 8 u: o _9 p* Q$ x1 M; E- IEC 605892 w7 h5 K' Q" p! V( d# x* C+ v' d/ E
Decision approved at the + U p; q$ A# R1 u3 o8 e P46th CTL Plenary Meeting,# V1 l$ N0 b6 x
in 2009 # y( ?8 l6 H! _+ m2 j6 GQuestion: & j b! Q' |& LClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating u! i: u; E) Zvoltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”., S/ g5 T: j, b7 ?" \- g% [$ B. L
The procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum 3 S5 @3 y# T6 @( s+ Z' ]2 P3 Delectrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather 0 v: c& ^0 O4 s) ~3 pthan an appropriate electrical test laboratory measurement technique.. I1 i* _6 K' k1 x" a7 p
Are CBTL:5 z- L7 Y5 n6 I
- (a) expected to use this method of measurement for solution conductivity; or2 l( H4 f! j( a, r8 \ m6 w
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz2 E# r: J2 c2 Y; k9 u
be used; or 2 E9 k# q" ?! `4 O9 O" }6 w- (c) can any suitable conductivity meter (different measurement range) be used.6 Q- `' J( v2 S j8 P4 W# s
Decision:+ k5 c! i& Y$ |& t
The Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and . b* Y: W5 ^; e$ u6 _- R$ J- funcertainty including the probe” is the only practical one - item (c) above. 1 K1 u. V3 z& Z$ t0 N0 y$ ^% R) `5 A * g; A# K7 y" D$ G- w* }[attach]77310[/attach] 3 D* G- L- M8 X: D
DSH 7248 ?" X- n) b' C: G/ W5 ]