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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! B$ |7 Q+ L# ^) A
temperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
p2 w" c* g7 Y8 hmm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron( x) U b* A0 c4 S4 l7 y
and constantan (Type J) wires, are to be used whenever a referee temperature measurement by
- P) r. z- F5 i H$ x) S2 u: dthermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
~. f8 R& ^4 |% B(Type T) wires may be used if it is determined that high frequency operation results in eddy current
6 C; ~) q$ v7 X7 T* N \. nheating of iron and constantan thermocouples.
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. u! B- Y+ K, N3 A' ~3 s' C9 ]
F7 @( Z# S8 X2 g, d. S3 \
+ }, ] R1 j3 \- tUL8750有具体要求。 |
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