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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 i" `, r3 x( O$ B0 ^
temperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
; U! h2 e A9 J1 s5 Q% nmm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
$ v& j4 ^ d- o2 |5 r. z( Mand constantan (Type J) wires, are to be used whenever a referee temperature measurement by
! K9 H+ ]9 n& u9 \ E/ c' F0 U0 J- bthermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
* _0 X& ]* _: p& y(Type T) wires may be used if it is determined that high frequency operation results in eddy current" _! K1 ?9 L# k% o) e V
heating of iron and constantan thermocouples.
. M, {2 R- {; o
6 H" k: M6 r+ E7 ]: _: R# _6 E1 [4 c5 }. K& d5 Q
2 O5 z/ g: k/ N) |$ T- R* y
UL8750有具体要求。 |
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