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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& v: G2 H& Otemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.210 J3 D% F1 n* v: Q# R, w
mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron2 G3 F2 p1 W% j0 r, ~& |
and constantan (Type J) wires, are to be used whenever a referee temperature measurement by" d; X; R; o& f5 D2 I: K: r# ?
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
2 p7 G! `+ ~ H5 T(Type T) wires may be used if it is determined that high frequency operation results in eddy current) O/ U9 M. S" d7 M; F" I
heating of iron and constantan thermocouples.2 g+ [6 z5 y7 E- j1 J3 f+ r( C/ ~
# I2 v- a5 l! w4 r8 m
- z- |: K$ U* J( w1 ~# j3 C/ Z$ ]7 ]8 O: X& N8 ]
UL8750有具体要求。 |
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