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Some simple fire alarms do not have sensors but require a person to notice smoke or fire conditions and manually trigger the alarm.
Some commercial systems without "sensors" have switches connected to other devices that indicate when a fire is in progress, such as water flow in the fire sprinklers or fire extinguisher triggered in a commercial cooking hood.
In those cases, the "sensors" are part of another system that happens to be tied to the fire alarm.
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What is difference between a fire alarm and a burglar alrm?
A fire alarm turns on when the sensor senses heat nearby while a burglar alarm senses movement or forced entry from a specific area it is guarding..
Can you paint fire alarm sensors?
Most fire alarm products state that you shoud not paint over the fire alarm detector. This could ruin the sensor, and if it's broken, the company would probably blame you or charge you extra for doing something that they told you not to do. Idealy, you shouldn't do it in any case. The fumes could damage the sensor's components inside. So no, not really!
What is the maximum number of devices can be connected in one loop of a fire alarm control panel?
There is no such standard. Fire alarm control panels are typically customized for as many loops as necessary for the structure. It may have one loop or a hundred or anything in between.
Why can a fire alarm go off without a fire?
A smoke alarm or temperature sensor will also detect quick increases in ambient temperature. If your smoke detector is going off for no reason, it may be too close to a heat source like a stove, bathroom or furnace room, or it may be defective and need servicing.
What is a fire alarm cause and effect matrix?
That is the analysis in which process generate and sort hypothesis about possible problem in the process by asking participant to list all the causes.
What is a Fire Sprinkler alarm valve?
Some fire sprinkler systems have a valve for testing the water-flow alarm by allowing water to flow to the alarm, or through the alarm-sensing pipe, without activating any sprinklers in the rest of the system.
Who invented the first Heat detector?
The first electric fire detector was developed in Brooklyn, NY in 1863 by Alexander Ross, however the first electric fire sensor to see commercial use was designed by another New Yorker, William B. Watkins. By the early 1870's, Watkins had developed remotely monitored fire alarm systems using heat detectors and in 1873 formed the first private fire alarm company (Boston AFA) which surivives to this day as AFA Automatic Fire Alarm) Protective Systems.
Which alarm can protect people from fire?
Fire Alarm
How does a simple fire alarm works?
A simple fire alarm has a sensor or switch that reacts to fire or smoke and trips a device that makes noise. For instance, you could use a string pulling on a switch that is held open by the string until the string catches fire, closing the switch and ringing a bell.
What is a function of a transistor in a fire alarm circuit?
A special sensor or transducer called a thermistor is used to detect an increase in the temperature of the surrounding air whenever smoke is produced by a fire. A different type of sensor is used to detect an increase in the size and density of particles in the surrounding air after it has been contaminated by smoke from a fire. Either sensor gives an output in the form of an increase in voltage whenever it detects an increased temperature and/or smoke particles. That increase in voltage is fed to the base of a transistor. When the voltage to its base increases, the current from the transistor's emitter to collector (or from its collector to emitter) increases and that increase in current operates the alarm. In other words, in a fire alarm circuit, the transistor acts as a switch which turns on the alarm whenever a sensor or transducer detects the presence of a fire, else it remains off.
What is another phrase for fire alarm sounded?
The fire alarm rang
What does a fire alarm technician do?
The fire alarm technician is in charge of the installation of fire alarm systems. Fire alarm systems include addressable or conventional alarm control panels, smoke detectors, heat detectors, manual button alarms, sirens and strobes, signs, etc. A professional fire alarm system is large with professional addressable bus lines alarm systems, addressable detectors for building fire security, or other special field fire security. So, the fire alarm technician should be knowledgeable in alarm systems working principles and installation.
