THERMOSENSING AUTOMATIC SWITCH

摘要

PURPOSE:To stop the operation of a signal processing circuit forcibly and to easily set an illuminance at which the signal processing circuit is operated. CONSTITUTION:The switch is provided with a signal processing circuit 7, in which a relay (r) is turned on and power is fed to a load L when a thermal ray radiating from a heat source is detected by a thermal ray detection element 6. The signal processing circuit 7 is operated when a surrounding illuminance detected by a light receiving element PS is a set illuminance or below. A lower limit of the illuminance at which the signal processing circuit 7 is acted is regulated by an operating level regulator LV. The operating level regulator LV is provided with a rotary switch RS to select any of plural fixed resistors R1-R4 connecting to the element PS. The rotary switch RS is a rotary dip switch and is provided with a rotary position at which any of the resistors R1-R4 is not connected. The operation of the signal processing circuit 7 is stopped at this rotary position.