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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
% h7 }2 J {8 `; W0 jtemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21$ f) K; s* k- F( T
mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
- J4 D1 t+ w" _9 K0 T: o2 Yand constantan (Type J) wires, are to be used whenever a referee temperature measurement by
S$ H6 M; ~1 \1 \( g0 [thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
, {: { w+ K; e(Type T) wires may be used if it is determined that high frequency operation results in eddy current
# t; C* Q* ], F S7 V5 Cheating of iron and constantan thermocouples.
9 K/ @, `- Y# v( d: w: E0 F' u$ S* @" s2 r
2 C1 \: ^- p" a6 [) d, |1 T3 @: ^+ D' @
UL8750有具体要求。 |
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