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|  DSH 724
6 x# @6 l4 B3 S! {6 S, X
& |4 p/ ^2 O/ t+ r7 R | Measurement of Conductivity
7 D! b \& \1 X" B+ [8 @& R4 k% F0 S | 7.3
8 @; x8 N3 A4 d | 60112(ed.4)
) |' k m9 ^& I. b: [+ k0 E |
/ u5 \# s- y( R- [3 g5 zStandard(s): IEC 60112/2003 No. Year
/ O8 W- U8 @; T% f5 i4 }0 Z+ VEd. 4.0: j2 ]8 z6 h; }. g- A
DSH
; F& r5 w+ r3 G! @$ b9 T6 v8 `0724; c. Q/ r( }& P, B9 n+ Q t8 Z( q
2008& v# s# w1 `6 b
Categories: Various, General Y% i& g# J3 b; j% z" g2 K
Subclause(s): 7.3; V) k5 @' o, {; ~8 G/ w
Developed by: WG4
8 _( N% }5 `; Z! U* g: w' j- _Subject: Measurement of
+ {; c# `6 X0 Z. mconductivity* C6 x- |5 _" G: q2 v
Key words:& {( X; {5 I' I+ _$ E+ S4 f- u( _
- Tracking solution
9 B4 L4 n( A9 N8 W5 j! X# y7 g8 k- Conductivity, x0 B1 R+ j' U
- IEC 605893 d7 ^: w! E3 ?6 L" i) x+ k: U
Decision approved at the
1 l, d. w1 K y1 q' F* o. b9 B( J4 w46th CTL Plenary Meeting,
& |& s/ g3 p5 ^in 2009
1 X" m7 u9 a/ ]* J! ^Question:* ]3 I# p- k Q2 \0 K
Clause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating5 T* ]8 E& K5 s+ g) {) L
voltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.9 @- H7 T3 N8 w" j
The procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum2 l5 h$ H% R% c2 [$ V
electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather' A/ F, V$ @1 J k Q- N1 F# ^
than an appropriate electrical test laboratory measurement technique.+ \& y+ V/ Q4 i; X0 s+ @4 q6 `
Are CBTL:
! G( U+ g( B# E- (a) expected to use this method of measurement for solution conductivity; or" p2 a+ R& ~% s# o6 `" k, V1 }
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz
3 H# N- M5 t, j$ ybe used; or
6 @' U# z2 b0 t# L# A- (c) can any suitable conductivity meter (different measurement range) be used.
2 ]" {/ ^5 }6 ~; p+ oDecision:
/ Q+ ~1 p& w: ^( ^; k2 p0 AThe Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
. h: d) C" `" V1 K: Nuncertainty including the probe” is the only practical one - item (c) above.
3 e% m* F8 N4 E9 U! r! P& P# I& ~3 L# i4 d; n
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