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有302系列的探测器都是常开的系统，有135华氏度（57摄氏度）和194华氏度（90摄氏度）两种定温度等X。
All 302 Series Detectors are normally open devices ａnd are available in either 135°F (57°C) or 194°F (90°C) ratings. Each unit is constructed with a high expansion .040 anodized aluminum （氧化铝）sensing shell ａnd fine silver contacts which are hermetically sealed to ensure reliable operation. Electrical Rating （额定电功率）6-28 VDC, 1 amp. (all models)
302-135- Interior, Vertical Mounting Fixed Tdivperature 135°F Maximum Spacing - UL 50＇ x 50＇
302-194 - Interior, Vertical Mounting Fixed Tdivperature 194°F Maximum Spacing - UL 50＇ x 50＇
这款应该是室内使用
302-ET-135 - All Weather, Vertical Mounting Fixed Tdivperature 135°F Maximum Spacing - UL 50＇ x 50＇
302-All Weather, Vertical Mounting Fixed Tdivperature 194°F Maximum Spacing - UL 50＇ x 50＇
这款是所有的环境使用
302-AW-135 - Moisture ａnd Dust Proof, Vertical Mounting Fixed Tdivperature 135°F Maximum Spacing - UL 50＇ x 50＇
302-AW-194 - Moisture ａnd Dust Proof, Vertical Mounting Fixed Tdivperature 194°F Maximum Spacing - UL 50＇ x 50＇
这款是防潮和防尘
302-EPM-135 - Explosion Proof Screw Base, Vertical Mounting Fixed Tdivperature 135°F Maximum Spacing - UL 40＇ x 40＇
302-EPM-194Explosion Proof Screw Base, Vertical Mounting Fixed Tdivperature 194°F Maximum Spacing - UL 40＇ x 40＇
