DSH 724 Measurement of Conductivity

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DSH 724   |& I$ j( N/ N! l& Q

Measurement of Conductivity 9 O# g2 E4 b' v$ e' ~" C7 o- I! K

7.3 0 z& t$ S- C! g0 s/ |

60112(ed.4)

, V3 I- v+ t! m- S  C+ t3 d! zStandard(s): IEC 60112/2003 No. Year
Ed. 4.0
, B6 D1 B9 K/ P/ d  k* X3 z" l( dDSH
0724
2008
* a2 J% ^. s" Y& {9 q% OCategories: Various, General
Subclause(s): 7.3
Developed by: WG4
% l* f/ ]  W6 ~5 RSubject: Measurement of
1 P+ \( a& L: U7 f/ l8 k/ S% N8 hconductivity
Key words:
6 e5 n% @7 M" ^5 R; A/ f5 y- Tracking solution
) \$ Q  H$ ?! j: }( i- Conductivity
- IEC 60589
Decision approved at the
46th CTL Plenary Meeting,
in 2009
4 P6 l  ?. b* tQuestion:
2 G# ]9 a( u! r$ T) W% ?Clause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
# Y( R" B1 {, T4 b9 t  Fvoltage 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
7 ^- B, w: t  b* I8 W7 ~electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather
than an appropriate electrical test laboratory measurement technique.
Are CBTL:
- (a) expected to use this method of measurement for solution conductivity; or
% W' f6 g1 l# d* ?- k4 E, B- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
be used; or
- (c) can any suitable conductivity meter (different measurement range) be used.
Decision:
1 A1 _1 q' I3 ^& TThe Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
/ P9 p7 H6 O6 E9 O5 {4 Euncertainty including the probe” is the only practical one - item (c) above.
  y/ c; \/ R5 {% E* G3 k, O8 y
8 q! u$ a* H0 o' h