DSH 724 Measurement of Conductivity

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DSH 724 - n) E0 N  e$ `- @

Measurement of Conductivity

7.3 ; k  q) }! {! {9 h) G

60112(ed.4)

Standard(s): IEC 60112/2003 No. Year
Ed. 4.0
! ]5 q5 O0 ^! d3 xDSH
0724
2008
Categories: Various, General
) ]; D# i2 j6 Q7 N- h8 MSubclause(s): 7.3
Developed by: WG4
Subject: Measurement of
: {6 P5 p" `. @0 q' R4 m' @* c5 \conductivity
Key words:
- Tracking solution
, O" ?8 X1 f& e+ V, X( @. ^  j% V1 M- Conductivity
- IEC 60589
Decision approved at the
, N8 y7 _( L; K5 k46th CTL Plenary Meeting,
in 2009
Question:
" J9 H4 d# t" \; J+ x' o2 GClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
( t2 k9 E5 c# y4 S& b7 ivoltage 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
) E6 H& G3 N* ^7 Q$ E: q: a  ~electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather
' ~1 e5 r2 U0 {$ Ithan an appropriate electrical test laboratory measurement technique.
5 p! A& @/ Q' i4 Q+ t4 EAre CBTL:
- (a) expected to use this method of measurement for solution conductivity; or
9 h. G$ e( j* z2 A; a$ e6 d. t& s' J- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
( |; \& r& X2 i2 ybe used; or
- S' J# f8 V$ S# U) ^; s- (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
3 X, c* u# ~$ A1 N2 q$ Huncertainty including the probe” is the only practical one - item (c) above.
; j- A/ U! j& A6 E

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