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The Importance of the Fire Alarm Circuit
By Arthur Sneddon

When it comes to the safety of yourself and your family, nothing is more important than the piece of equipment that detects danger and sends a warning in time. In your home, that piece of equipment is the fire alarm circuit. The inner workings of this little sensor send the signal that saves lives every day throughout the world.

Working for Safety

The most important thing in a fire is to detect the danger as early as possible and alert those in jeopardy in time to evacuate safely. The fire alarm circuit accomplishes this task by sensing either smoke or increased heat, triggering an operation that sets off the alarm and contacts the monitoring company which calls the fire department while the family escapes the home. Types of emergency systems vary widely according to the services offered by the monitoring company and the type of equipment used. The fire alarm circuit used in most smoke detectors is similar, however.

In a photoelectric smoke alarm, smoke comes between a light and its sensor, blocking the reception of the light and sounding the alarm. If an ionization alarm is used, the smoke particles stick to ionized air which reduces the ionizing current. This is detected and the alarm sounds. Of the two types of fire alarm circuit, a smoldering fire will usually trigger a photoelectric circuit more quickly. The ionization circuit is normally triggered more quickly by a fire with flames. Both types of fire alarm circuit will detect both kinds of fire danger before a person can.

However, because there is a slight difference in detection time, combination smoke detectors are available. Fire alarm systems also use heat detectors. In this type of fire alarm circuit, resistance is lowered as heat increases. When the heat level reaches a set level, the circuit responds by triggering the alarm.

Most monitoring companies bundle the fire detection alarms with burglar, carbon monoxide and whatever assortment of detection devices deemed necessary. The fire alarm circuit is often connected to a communication system which allows the monitoring service to speak to the home's residence.

Many customers use this system for health emergencies as well. Some homeowners include motion detectors, radon detectors and moisture detectors in their alarm package. Wireless systems can include a dialing device to call a programmed phone number with a notification of a problem at home if something occurs during working hours. At the heart of this marvelous system is the humble fire alarm circuit.

Author Details:
Arthur Sneddon, writes for various web sites, such as The A to Z of Home Improvement, about home security, fire alarms etc.

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