| 摘要 |
<p>The analog smoke detector (3a) includes a transmission/reception circuit (31) for receiving an A/D conversion command from a control panel through a transmission path (8). It is composed of a light emitting element (38a), a test light emitting element (38b), a light receiving element (39), a light emitting element drive circuit (36), an amplifying circuit of received light (40) and transistors (Q1, Q2, Q3). It is further provided with a MPU (32) which includes a CPU, a ROM storing determination levels, a working RAM and the like An EEPROM (33) is externally connected to the MPU (32). It includes a light emitting element control circuit (36) for outputting a drive pulse based on the light emission control pulses P1, P2 output from the MPU (32) and the detecting light emitting element (38a) for emitting light for receiving dispersed light caused by smoke generated by a fire. <IMAGE></p> |
