DSH 724 Measurement of Conductivity

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DSH 724 $ J' q. t- r- A& R, G& C, q

Measurement of Conductivity

7.3 % A1 e3 U  b# D. x

60112(ed.4) ! |1 P/ F. u2 A! u! `2 O& `

Standard(s): IEC 60112/2003 No. Year
Ed. 4.0
3 \! f' W# X9 {0 xDSH
  b0 p! t$ Q, i; Q+ \* }3 I0724
- P  s; f( S: D7 R2008
Categories: Various, General
. t1 c" {! J( S  ]9 l7 N1 P3 NSubclause(s): 7.3
; |( _- M9 p$ z6 U6 h1 J" a; y4 EDeveloped by: WG4
  P; P9 y; o9 L4 g9 g1 ~2 }3 B  ]Subject: Measurement of
conductivity
0 W$ O7 a' {  r0 f! Q  o/ mKey words:
- Tracking solution
- Conductivity
6 |. T9 }* G) d; D* P6 q6 w2 F- IEC 60589
Decision approved at the
0 y7 v8 k3 n0 \2 X  [& R$ z46th CTL Plenary Meeting,
6 X' k7 Q; T& r6 x0 U  \3 }5 E$ Yin 2009
* ]* h) n- ?# j; E* K% wQuestion:
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”.
% t# g) l: [( V4 l" C  mThe 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
* T0 t1 o* J+ ?# m1 `2 Qthan an appropriate electrical test laboratory measurement technique.
Are CBTL:
& C  M3 u$ b6 L  f: T+ n0 Q  b- (a) expected to use this method of measurement for solution conductivity; or
. P! s* y: H, Q* g$ V( Y) \( J- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
; y3 a( n% T9 H/ Ebe used; or
- (c) can any suitable conductivity meter (different measurement range) be used.
* g; P9 C0 S: ]Decision:
- v) I2 C) ~8 [7 g9 W: MThe Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
) h" W( x1 {3 u& |9 \& Auncertainty including the probe” is the only practical one - item (c) above.
+ Z" g3 g8 g# B( f5 @0 E' ~, z
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