Smoke Detector Buying AdviceSmoke detectors are one of those amazing
inventions in modern world. Because of their obvious potential
to save thousand of lives and property each year, smoke
detectors are getting more and more important for people¡¯s
safety. In fact, it is recommended that every home have one
smoke detector per floor. Most smoke detectors consist of two
basic parts: a sensor to sense the smoke and a very loud
electronic horn to wake people up. There are two main types of
smoke detector commonly available on the market. |
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One type uses the radiation from a small amount of
radioactive material to detect the presence of smoke or heat
sources. These "ion chamber smoke detectors" are the most popular,
because they are inexpensive and are sensitive to a wider range of
fire conditions than the other type. Ionization chamber smoke
detectors contain a small amount of radioactive material
encapsulated in a metal chamber. They take advantage of the ions
created by ionizing radiation to develop a low, but steady
electrical current. Smoke particles entering the chamber disrupt the
current and trigger the detector's alarm. Ionization chamber
detectors react more quickly to fast flaming fires that give off
little smoke. An ionization chamber for use in a smoke detector
includes first and second outer electrodes and a non-reflective
center electrode. The non-reflective center electrode can be formed
as a metal electrode having a non-reflective coating or as a
non-reflective; conductive plastic elements. The ionization chamber
can be incorporated into combination smoke detector, which includes
a photoelectric sensor. A non-reflective center electrode,
associated with the ion-type sensor is symmetrically located in the
detector and displaced from the photoelectric sensor.
The
other type of detector does not contain radioactive material; it
uses a to detect the change in light level caused by smoke. This
type is more expensive to purchase and install, and is less
effective. Most photoelectric sensor smoke detectors use 100V-240V
AC input. It also can use 9V spare replaceable battery when the AC
power is out. It is always specially designed for convenient
installation and wiring module protection. This kind of smoke
detector is easily adapted to different environment. CMOS design and
light labyrinth photoelectric sensor smoke detector. People can
apply manual testing for new detectors. High stability and high
density SMT design help to provide quality service to not only homes
but also commercial areas like offices and hotels. Unique structure
with dustproof, anti-fly and anti-light design makes it easy to
maintain. Auto reset function relieves your concern of resetting the
smoke detectors after a power blackout.
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