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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
, X1 L9 b4 G8 e& F" U( itemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
" S; L) r9 Q, pmm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
4 ^7 K$ y) o1 z' K2 t: D/ xand constantan (Type J) wires, are to be used whenever a referee temperature measurement by
6 B! ?4 y6 E1 v0 fthermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
. ^& v" a) i& `4 A(Type T) wires may be used if it is determined that high frequency operation results in eddy current! B: z/ `5 }, `# }+ N4 V
heating of iron and constantan thermocouples.6 g6 z2 r: v; j1 T1 \
% R6 L" T, R. y" h7 q8 O+ S
J- [ F# k' L) {1 _, Q5 a. O ]5 K; Y c& o% f) D
UL8750有具体要求。 |
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