Potter Electric Signal 1430012 | PS-24H Photoelectric Smoke/Heat Detector

The PS-24H photoelectric smoke detector utilizes two bicolored LEDs for indication of status. In a normal standby condition, the LEDs flashgreen every 3 seconds. When the detector senses that its sensitivity hasdrifted outside its ULlisted sensitivity window, the LEDs will flash Redevery 3 seconds. When the detector senses smoke and goes into alarm,the status LED will latch on Red.The detector utilizes an infrared LED light source and silicon photodiode receiving element in the smoke chamber.During a normalstandbycondition, the receiving elementreceives no light fromthe pulsing LED light source. In the event of a fire, smoke enters the detector smokechamber and light is reflected from the smoke particles to the receivingelement. The light received is converted into an electronic signal.Signals are processed and compared to a reference level.And when twoexecutive signals exceeding the reference level are received within aspecified period of time, the time delay circuit triggers the SCR switchand the LED's light continuously during the alarm period.