DSH 724 Measurement of Conductivity

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DSH 724 ; |% G9 M, M4 `( c

Measurement of Conductivity

7.3 9 z3 {1 V1 b( i5 t0 t0 i% g* C

60112(ed.4)

Standard(s): IEC 60112/2003 No. Year
1 Q5 w7 E. g* b6 BEd. 4.0
# V( \7 U$ j$ \' _* A5 p+ B. ^/ R4 f. tDSH
" y) M! \2 F" K+ p4 a0724
2008
5 T" H  A# J: o, h9 m; \* X4 x0 @Categories: Various, General
Subclause(s): 7.3
% j0 o) S7 Q; M) W* a- mDeveloped by: WG4
8 t% _3 o& W4 Q7 z9 x3 k. iSubject: Measurement of
+ L7 _9 S9 E: [7 h! yconductivity
! d# ~; r) o+ E/ p9 m) C# OKey words:
4 h( J( |0 U* V- J$ E- Tracking solution
- Conductivity
- IEC 60589
Decision approved at the
46th CTL Plenary Meeting,
in 2009
Question:
* c1 j: T+ F4 F; O" oClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
+ J& H% g4 h% `7 Avoltage 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
# H% [9 u4 [1 q' m# Zelectrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather
* K& i6 Z* u: ^, ]5 v* |than an appropriate electrical test laboratory measurement technique.
Are CBTL:
$ J8 q0 ]5 u9 W( O' v0 w- (a) expected to use this method of measurement for solution conductivity; or
3 n1 \& h. c& q" i0 P' }3 ~- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
1 G: s9 m( U* n2 Wbe used; or
5 }5 t; D; y9 q0 w" U. P- (c) can any suitable conductivity meter (different measurement range) be used.
Decision:
6 \5 }7 \3 z/ [8 i! R- p; n- DThe 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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