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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 the0 a3 J; ~0 T" d1 M" I1 W: y9 b0 {
temperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.214 _! T. [# g9 }' C k
mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
. {0 f( u; S: c, r: Fand constantan (Type J) wires, are to be used whenever a referee temperature measurement by M) x( p; j% g
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
0 X; C5 ]$ b9 r+ l(Type T) wires may be used if it is determined that high frequency operation results in eddy current
% y7 t- K: ~& p, k" L( }6 ~1 \4 Eheating of iron and constantan thermocouples.4 t2 K- F/ g# a* Y
1 k- ?; W+ d/ P; L1 L7 Z( V
/ W' a6 f. B: p+ Q
, y' R8 ^+ q4 \1 F! k8 b+ X% T7 l$ y) }
UL8750有具体要求。 |
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