DSH 724 Measurement of Conductivity

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DSH 724 ( f" J+ w& K4 B  f. k7 F

Measurement of Conductivity

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60112(ed.4)

( }1 U7 I" H& W6 F+ |; s! c. lQuestion:
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:
- (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
& f6 w2 v9 X1 M% D* z- (c) can any suitable conductivity meter (different measurement range) be used.
' D% q1 @# Z) J& G9 [+ yDecision:
; v! ]" }/ [- QThe 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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