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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
) G7 R4 `- N* z5 x- t) Itemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
: _& ^) P0 E& f. j& Dmm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
G) G% r2 O, i. ^. ]and constantan (Type J) wires, are to be used whenever a referee temperature measurement by: [9 W! C4 P+ Y }1 {# V. T
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan- M( s9 L0 D/ P! p8 ^
(Type T) wires may be used if it is determined that high frequency operation results in eddy current
8 h4 M8 q1 X! z9 q4 t9 m6 F; Mheating of iron and constantan thermocouples.
0 q+ @; u" C3 l5 H* |5 L( ]
" H* ~* I5 V/ [ ^' q! r7 V. I
% g* m7 ?8 T0 ?1 C9 c. C1 r% W- O1 {0 A
UL8750有具体要求。 |
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