DSH 724 Measurement of Conductivity

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DSH 724 ' x( A6 }& X5 r7 B 2 d8 J( R/ J* \8 d; I! e

Measurement of Conductivity ( h4 c8 h+ p4 N: b2 j

7.3 ; u1 C5 i0 Q4 y2 L# Q. P1 ?3 \9 q+ R

60112(ed.4) ( ?& R6 H% a" p$ a

' R) C) L" k/ S2 gStandard(s): IEC 60112/2003 No. Year
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DSH
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  }' E% O7 [9 `% L( W' q2008
. B. o6 p2 E5 ]6 F2 t5 zCategories: Various, General
Subclause(s): 7.3
Developed by: WG4
4 v4 j; p! y- N2 F8 d+ KSubject: Measurement of
conductivity
6 k* ]4 J, u9 lKey words:
6 `, j+ d7 B9 T! ~: u- Tracking solution
- Conductivity
0 n: \6 W8 F- r9 X, d- IEC 60589
Decision approved at the
46th CTL Plenary Meeting,
in 2009
Question:
Clause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
voltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.
) J, g; w% C- k' KThe procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum
) `3 Z/ `/ _5 R$ r; w7 ?electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather
" p: x) m1 q6 ]: m, H. ?than an appropriate electrical test laboratory measurement technique.
Are CBTL:
7 A* U$ q, b2 ~- (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
be used; or
- (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.

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