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|  DSH 7241 o! ^* N, I* H; ]2 Y( A
5 t" v0 h! S& P/ v* x; e# o
| Measurement of Conductivity o# @* K7 p( m! K6 ]
| 7.34 P. W6 v6 C) L/ `8 s. f
| 60112(ed.4)
) r6 U! I$ A1 S# O7 L: w |
7 x# z+ W8 K( T) q
Standard(s): IEC 60112/2003 No. Year! z& G* {! }* i4 g
Ed. 4.0
$ h6 O, H6 x0 a* fDSH
+ T6 ^! L6 T7 w4 I. I) d \0724
% d# O0 R2 I, i! H% F5 s b2 |2008
9 ?1 g: s+ b8 P4 VCategories: Various, General
g% `4 J" {6 W' nSubclause(s): 7.3
: h4 S- A$ `) y5 UDeveloped by: WG4
2 i& F1 s8 r3 Y; ?& s, d/ |/ TSubject: Measurement of3 q/ V9 t0 q4 O! s% b% Y# S6 L
conductivity
3 I4 J& S4 k; \Key words:
& l4 G' H' `4 J# B) G7 W- Tracking solution; I9 M3 y7 m, B! T8 h4 f
- Conductivity* d5 X3 K ]' D% K0 Y
- IEC 605898 b P1 y, p$ z
Decision approved at the6 y5 O2 N1 \2 u
46th CTL Plenary Meeting,
% O/ _4 I6 _) d5 P( a) C7 Zin 2009
9 h4 X2 Z' q6 ?; `& y2 QQuestion:
8 e# g% l9 q% F, m1 ]. qClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating7 t. _8 E! _8 N, q
voltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.
, @! c2 V. r' F9 o; b5 ^0 z$ tThe procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum* f% F/ H) O$ Q9 N: Z
electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather* W) f2 _" d$ f$ R4 Z
than an appropriate electrical test laboratory measurement technique." Z% R X7 D* G9 n! v
Are CBTL:
, k+ y1 ~9 ^6 u+ z$ V- (a) expected to use this method of measurement for solution conductivity; or
# T; n: M& ]2 I5 [2 p ~& j$ u- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz; g& k+ B6 }5 i
be used; or7 A/ E- L$ R( y7 F. P0 f' Q" T/ M2 ^
- (c) can any suitable conductivity meter (different measurement range) be used., B3 n4 d5 j+ ]" p: _2 y P
Decision:- ]8 k' ?7 `2 P/ O J4 z
The Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
0 C& u9 u$ V, i/ |uncertainty including the probe” is the only practical one - item (c) above.
% X0 V+ \5 t& n, s9 K1 H( l4 T7 V6 N0 f) }" {% }* Y0 H
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