DSH 724 Measurement of Conductivity

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DSH 724 ( e3 a" X: d: Z; u8 ? 7 d6 y1 d% F0 X* |* l

Measurement of Conductivity

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60112(ed.4) $ {  C5 p- }6 d/ A) q

# M7 S; X. j! Z( Y' U* i! AQuestion:
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.
2 Q- a2 c+ k5 B- O' U# o, JAre CBTL:
  A, W/ T7 e: L- (a) expected to use this method of measurement for solution conductivity; or
- j; R, V' ~3 Y+ ~- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz be used; or
6 a  ^  o: F" Q7 J1 J( V- (c) can any suitable conductivity meter (different measurement range) be used.
* ~; i4 V6 {4 J& s+ d5 c* WDecision:
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.