LIGHT TRANSMITTING PART AND LIGHT RECEIVING PART OF EXTINCTION-TYPE SMOKE SENSOR, AND THE EXTINCTION-TYPE SMOKE SENSOR

摘要

PURPOSE: To enable one operator to properly and speedily adjust the light emission quantity of the light transmitting part by controlling the quantity of light emitted by an LED for light transmission according to the contents of a light emission quantity value request instruction when a transmitted code received from the light receiving part is the light emission quantity request instruction. ;CONSTITUTION: The light receiving part 20 changes the contents of the light emission quantity adjustment instruction of the transmitted code according to the light reception quantity of the light reception part 20 and a microcomputer 24 serves as a light emission quantity adjustment instruction changing means here. Namely, when a monitor/adjustment changeover switch 25 is switched to the adjustment side, the microcomputer 24 compares the current quantity of received light with a specific reference level range, and change the contents of the light emission adjustment instruction into an increase instruction when the level of the difference obtained by subtracting the lowest reference level from the light reception quantity is minus or into a decrease instruction when the level of the difference is plus and the level of the difference obtained subtracting the highest reference level from the light reception quantity is plus. Those light emission quantity adjustment instructions are sent with transmitted codes to the light transmission part 10 to control the resistance value of a light emission quantity adjusting circuit 13.;COPYRIGHT: (C)1996,JPO