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8.3.17 The junction of the thermocouple is to be firmly secured with the point on the surface on which the
5 q5 `3 c$ n; Y2 A( Rtemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21/ d$ h, m3 v, S7 N- J* u( C7 Z
mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
3 K7 l8 d9 Y1 R6 Q! v& J8 }. Hand constantan (Type J) wires, are to be used whenever a referee temperature measurement by# m- H2 O2 i( U# P" Z: v
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan9 T2 J4 `) C9 k- a0 m
(Type T) wires may be used if it is determined that high frequency operation results in eddy current
1 ]/ @1 l6 }, h8 `4 x, Jheating of iron and constantan thermocouples.
% u* O/ N% J+ n( g' |1 v& g, h
' `8 f( S, t# q. e3 r( w" v
6 X& O h( \0 I: s0 |; S' L6 T) W) c# Z- G" v; u
UL8750有具体要求。 |
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