What is a fire alarm system circuit?Mayara
All commercial buildings must have a working fire alarm system. If you oversee a commercial building, obtaining an alarm system is one of the first safety prevention steps you should take. Installing a proper fire alarm system keeps occupants safe and keeps you in compliance with government policies. To effectively install and maintain a working fire alarm system, you need to know how it functions both inside and out. To shed some light on the working parts of fire prevention equipment, we’ll address an important question: what is a fire alarm system circuit?
Jobs of a Fire Alarm System Circuit
There are two major jobs that the fire alarm system circuit has to carry out if an emergency occurs. The first and possibly most important job the circuit has to accomplish is detecting excessive amounts of smoke or heat. Secondly, upon detecting the mentioned hazards, the circuit must also alert the occupants of a building by using loud buzzers or alarms. The circuit completes those tasks with the help of a specific heat sensor: a thermistor.
The Roll of a Thermistor
A thermistor is a heat-sensing device, or a “resistor,” that uses its level of resistance to signify heat levels. If the nearby temperature increases, the thermistor’s resistance decreases. Likewise, if the temperature decreases, then the thermistor’s resistance increases. If the thermistor’s resistance decreases, then so does the voltage that the device is sending to the transistor’s base-emitter.
The moment that the voltage drops below the transistor’s operating voltage, the circuit triggers the system’s alarm. To put it more simply, once excessive amounts of heat decrease the thermistor’s resistance, the system’s alarm should kick in and alert you of an emergency.
Now, we’ve adequately explored the question of what a fire alarm system circuit is. By knowing the answer to this question, you’re one step closer to improving your ability to maintain proper fire prevention equipment for your commercial building. At The Fire Alarm Supplier, we can provide you with various fire prevention equipment, including Wheelock fire alarm devices, so you can keep your building safe and up to code at all times.