Gas detector maintenance
Introduction
A smoke detector is an alarm that detects the presence of smoke in the air and emits an acoustic signal warning of the danger of fire. Depending on the detection method they use, they can be of several types:
When the device is connected to a central unit that activates visual or audible alarms, it is called a "smoke detector." On the other hand, an individual device that receives its energy through batteries and that acts independently of a central unit is called a "smoke alarm."
History
In 1902 George Andrew Darby), an electrical engineer from Birmingham, England, patented the "electric heat indicator and fire alarm". The device indicated any change in temperature in the place where it was placed. It worked through an electrical circuit that closed if the temperature exceeded a limit, sounding an alarm. It is basically the principle of operation of thermostats. Through successive improvements in the design, the current smoke detectors were reached.
Today, it is possible to find smoke detectors that include a carbon monoxide (CO) detector.
Guys
Optical/photoelectric detector
They can be of three types, depending on whether they detect smoke by obscuration or by dispersion of air in a space.
Furthermore, within optical/photoelectric detectors, there are two types of technologies: analog detectors and digital detectors (these technologies are found in conventional and addressable systems).
Conventional optical detector: This detector has the simplest technology. It is calibrated with electronic resistances. There is no software inside the device to do verifications. It is not designed to check if it is really smoke or if it is dust or dirt. This system, when it reaches the opacity parameters, is activated.
Digital and addressable optical detector: this detector includes a small software that, through mathematical calculations, verifies with several variables whether it is smoke or dirt, performing a self-verification before activating and sending the signal to the control panel.