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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 the1 V0 k, _+ N% J1 y0 g
temperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21
: g( i2 x- L% x0 t, C* |mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron
1 I+ Q# L9 j" M' L# a3 g- band constantan (Type J) wires, are to be used whenever a referee temperature measurement by. G" R$ ]0 [& U! a+ t9 [9 _' N& `) {. R
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan9 J" E Q, f* Y3 W0 u; j
(Type T) wires may be used if it is determined that high frequency operation results in eddy current
, \* j$ @, O: o- @) u) s$ ~heating of iron and constantan thermocouples.! V K3 R7 A# C4 W+ p* g9 C
. z5 `# L0 s: a0 e' N1 J' j8 z4 ~
' W$ r$ c. h* Y; _, Y
; {+ P( J+ n9 p' rUL8750有具体要求。 |
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