DSH 724 Measurement of Conductivity

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DSH 724

Measurement of Conductivity

7.3 ( |/ ~1 A; V; x/ n4 k

60112(ed.4)

Question:
: I$ ]4 `* j. Q4 _& WClause 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:
. t: ]  ?& d6 l) p& ~3 c- (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:
6 v/ x  g1 {; G. `7 i$ zThe 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.
) y( `3 R1 C5 L0 a* v