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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 z" k0 p$ K& h7 R6 k3 Gtemperature is to be measured. The thermocouple is to consist of wires not larger than 24 AWG (0.21! H: \3 P' f$ O! e- w) Y0 W+ f
mm2) and not smaller than 30 AWG (0.05 mm2). Thermocouples consisting of 30 AWG (0.05 mm2) iron" V7 z8 J' Z) K
and constantan (Type J) wires, are to be used whenever a referee temperature measurement by2 @) P; A: [- n- U5 v# \
thermocouples is necessary. Thermocouples consisting of chromel-alumel (Type K) or copper-constantan
! Y$ q8 ?7 w4 D0 A% M) z% n(Type T) wires may be used if it is determined that high frequency operation results in eddy current
6 z% U; q- L4 t4 M7 t$ z/ iheating of iron and constantan thermocouples.
1 h3 @1 K& F3 \$ Q7 r9 S6 T
/ D, Y" t8 i% w* D$ C& V/ v+ _7 t4 Z% z8 r- Y0 D
0 ?4 W7 b! G9 o; ^! g% S
UL8750有具体要求。 |
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