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UL 2556 規定如下:
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6 {" o( h7 w; [+ I4 o8 @- a6 I% ui) a forced air-circulating oven. The apparatus for the air-oven aging of specimens shall be as
8 t+ J% ?' Y$ k2 Mindicated in NMX-J-417-ANCE or ASTM D 5423 (Type II ovens) and ASTM D 5374 and shall
& n% j' [; q0 T' r* hcirculate the air within the aging chamber at high velocity. Fresh air is to be admitted,* Q7 P& R( d- [9 H; \
continuously, to the chamber to maintain normal oxygen content in the air surrounding the
' \. W: M6 O9 v2 b: q- n ^specimens. The exhaust ports of the oven shall be adjusted to achieve 100 to 200 complete
- _5 \2 L3 }" R# y! x7 s+ ofresh-air changes per hour. For purposes of calculating the number of fresh air changes the
( U) g5 S' x# o qvolume of the oven shall be based on the interior dimensions of the oven. The blower, fan, or
k( x- }. ?7 }% iother means for circulating the air shall be located entirely outside the aging chamber. The oven' J' o% H7 s0 ?1 b) b5 D" R+ H7 \
shall be capable of maintaining the temperature specified in Table 3;
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发表于 2014-9-17 11:07
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