DSH 724 Measurement of Conductivity

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DSH 724 & I2 A8 J: c8 O6 Y$ | " @% a5 f2 w5 \+ h- M; g$ t5 ~

Measurement of Conductivity / T$ B$ K) Y: @

7.3 7 f. n# N+ \- v7 @) r- b! m, D

60112(ed.4)

. a  w# f! S9 mStandard(s): IEC 60112/2003 No. Year
+ n0 m3 |6 L4 c! l7 BEd. 4.0
DSH
0724
7 T% z9 n1 {8 k+ k( b' v2008
" ]5 Y$ {% W# G3 S. E3 H1 T$ o. X6 {Categories: Various, General
Subclause(s): 7.3
) h" z) V; R8 E5 ~4 rDeveloped by: WG4
( P8 }; k+ U) G. ]6 g" QSubject: Measurement of
5 }- G. z: A  {+ e* sconductivity
! |4 B! Y/ D1 F# [Key words:
: G1 a3 h% {: R  Z- Tracking solution
- Conductivity
, X* r1 l( z, u, w- IEC 60589
1 Q3 p+ A+ o( L; MDecision approved at the
46th CTL Plenary Meeting,
, C" u, y: n1 \; N/ ~! t: Min 2009
Question:
Clause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
, {. t; o2 V# K' B3 t! Jvoltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.
The procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum
( d# C& @- |( ~: C5 Q- ]electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather
. `/ A4 @1 a/ d0 ~than an appropriate electrical test laboratory measurement technique.
5 }2 n. M3 m3 M& h7 b5 n7 Z2 Z# WAre CBTL:
( u( F. D! `9 g" T" Z* `- (a) expected to use this method of measurement for solution conductivity; or
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
+ a$ [/ x' |  I2 J. T* pbe used; or
4 E. u! b% y. A  I- (c) can any suitable conductivity meter (different measurement range) be used.
Decision:
The Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
uncertainty including the probe” is the only practical one - item (c) above.

" F4 L: g9 w6 M  x0 F