Donate SIGN UP

fire alarms

Avatar Image
my.apple.in. | 15:50 Wed 03rd Jan 2007 | Science
1 Answers
what is the principle ,working and construction of fire alarms?
Gravatar

Answers

Only 1 answerrss feed

Best Answer

No best answer has yet been selected by my.apple.in.. Once a best answer has been selected, it will be shown here.

For more on marking an answer as the "Best Answer", please visit our FAQ.
Ok, here goes. Fire alarms consist of a detector/s, a control point and a sounder or sounders. The detectors could be manual as in a manual call point or automatic, these are just acting as a switch to trigger the alarm. You could have smoke detectors which could be ionisation detectors, optical detectors which detect the presence of smoke using a photo cell, beam detectors used in large auditorium, heat detectors mainly used in kitchens and thermal detectors sometimes used outdoors. A sprinkler when activated by heat also triggers the fire alarm system. Within the control point there is usually a back up battery in case the mains fail and modern systems are usually addressable i.e. they tell you which detector head has actually actuated. Hope this is of some help.

Only 1 answerrss feed

Do you know the answer?

fire alarms

Answer Question >>