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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
$ ~* j8 g/ G* Utemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
; T6 G; [; W+ n7 }mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
* M1 Q2 A0 o+ u7 aand constantan (Type J) wires, are to be used whenever a referee temperature measurement by
& c$ [2 L! |( A: l% B9 O+ d, n) |) Mthermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
9 _$ ?. b5 g$ P(Type T) wires may be used if it is determined that high frequency operation results in eddy current2 v+ K1 _8 B* Q: [- V# r' }+ X. v
heating of iron and constantan thermocouples.
( J* o9 t; k7 I; ~
' R% s$ @% H9 c4 S0 @6 ^# R9 }+ X. Q/ W
2 e7 t. j c$ A6 J7 b& }UL8750有具体要求。 |
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