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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
$ S5 D3 v; H, C6 @, itemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21- U2 g3 Y/ l0 f1 r( S( [3 i
mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron; ?# K8 V* b, B B
and constantan (Type J) wires, are to be used whenever a referee temperature measurement by! P9 X1 F6 k6 \. ]8 a
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
# s8 J! b [5 n* O0 g: v(Type T) wires may be used if it is determined that high frequency operation results in eddy current
) g- R9 V! p# x& Q; s- _& E3 Lheating of iron and constantan thermocouples.# w! v6 }& O+ g' }
7 c' B- B" ^4 [; q; Z+ Q, B# l6 c" H* c: t& W5 _
: R$ ?6 [- l! H3 b' M+ i
UL8750有具体要求。 |
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