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| DSH 724
4 D* G3 Z* @/ }& L. @3 ]
) ]( @) V2 y+ U( ~3 a9 { K | Measurement of Conductivity
! y z5 W, Q. z9 u | 7.3
1 ?8 n9 n/ }0 J" Y' S8 N2 c4 v | 60112(ed.4)2 I) D% \( E0 b/ H. s+ b8 R
| ; J, S2 C, c9 | h
Standard(s): IEC 60112/2003 No. Year; {0 i. ~3 F0 O. m7 y, h
Ed. 4.0; M5 G: S6 |. h2 T, \3 _; J
DSH3 @, p. c9 n- r
0724
* x+ O/ ]$ |1 y2008
Y- t" x/ ?5 i. Q4 mCategories: Various, General, ?8 L0 h# c. S8 ?& h, b
Subclause(s): 7.38 G" u' X; F) x
Developed by: WG47 F$ z) D3 z% [9 I
Subject: Measurement of
; X1 H V" T5 e8 g7 T6 ]- Lconductivity6 {4 s, U9 S, a! U" Y+ a4 }
Key words:
; b# C9 l) k7 @$ ^/ k- Tracking solution5 d: @5 i+ d) ^5 v$ c) m
- Conductivity
8 n( ]! u, K0 D2 Y [! \- IEC 60589
$ p* S& }7 [2 q( G1 M1 J2 B; n% p' FDecision approved at the
& A$ }8 g2 z7 h& w3 V46th CTL Plenary Meeting,0 O6 _) A1 k' t( _2 @1 c
in 2009
3 W4 W, Q; \" W7 A# e% vQuestion:
7 \3 W9 c. X7 ^+ G$ pClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
2 l s# B+ o- H! {/ `6 \; t* zvoltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.
3 E7 K6 p8 u- _+ G1 K ^, aThe procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum
: W+ |7 l; \# z' delectrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather' G: z: `$ Y2 F X3 X6 p; `
than an appropriate electrical test laboratory measurement technique.3 G% O7 M$ K' E/ {( N$ v
Are CBTL:
3 f; |1 s$ M J- X1 Z7 I. l, A- (a) expected to use this method of measurement for solution conductivity; or* ^; c( T6 x- C0 x6 i | T# l
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
9 L" L$ }9 p/ m% ?0 jbe used; or: f9 R: ^/ V* B5 c; W
- (c) can any suitable conductivity meter (different measurement range) be used.1 Z1 A4 u2 [9 V; w
Decision:
8 H1 d: `2 V( ]. rThe Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and4 H! `5 I0 _# K$ E$ C- H! a
uncertainty including the probe” is the only practical one - item (c) above.$ U( O4 n6 R. n* i
9 E1 B; |. K# z$ s5 y6 f! m# d" W1 z$ k# Y* Q: n4 d/ f, a( ?
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