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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
4 A* ^& R: E% I E6 Wtemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
) S' w+ F4 T/ y. }, Lmm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron- z. z( P. s( K# u+ j+ q
and constantan (Type J) wires, are to be used whenever a referee temperature measurement by) {% s! w; I4 k6 \
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan$ l3 i7 ~( t# A2 b' Z( K9 R
(Type T) wires may be used if it is determined that high frequency operation results in eddy current1 R: G. ^+ d. \6 c Z
heating of iron and constantan thermocouples.
1 o6 G/ D! b& `( N
: r0 T6 r9 m( `. E: T# y! {0 v1 A0 W3 E
$ A7 p! Y U6 z3 e# ^' m+ p* K
UL8750有具体要求。 |
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