DSH 724 Measurement of Conductivity

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DSH 724 ! o* T' ^  S: v

Measurement of Conductivity / u4 D+ ~0 u# T, N4 u

7.3

60112(ed.4)

% e& a5 W6 g+ _6 QQuestion:
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”. The procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum 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:
" E9 I8 h7 ~( r. d6 D- k- (a) expected to use this method of measurement for solution conductivity; or
* n% I; B( N. S" G- F- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz be used; or
) D! G! G( z/ c# y# N6 A9 `( l- (c) can any suitable conductivity meter (different measurement range) be used.
' Y0 ^  q. k6 z# ]9 `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.