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Question
What is the difference between fire detector and smoke 
detector?
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Fire: Fire is a phenoena of chemical process which occurs
when a fuel(source) gets ignited by heat(Motivator) and
cotinues in presence oxygen(sustainer).

** when a fire occurs the resultant products are smoke,
heat and light.

Smoke detectors: Smoke detectors detects the presence of
smoke and initiates an change in circuit to trigger an
alarm/smoke presence.
There are basically two main types of smoke detector used
for smoke detection they are (a) Ionisation type and (b)
Optic type(poto electric).

Fire Detectors: Detects the presence of Light, They come in
varieties in sensing elements such as LDR, Poto diode, etc..
When comes to the area of hydrocarbon fires, these fuels
have an tendency to emit ultraviolet(UV) and Infrared (IR)
light frequency wave lengths. so where UV, ir, UV/ir
detectors are used.

In Breif: Fire Detector detects the light and Smoke
detectors detcts the presence of smoke.
 
Is This Answer Correct ?    17 Yes 3 No
Srinivasansureshkumar
 
Answer
# 2
fire detector senses the infrared rays where as smoke
detector senses aerosol .
 
Is This Answer Correct ?    18 Yes 10 No
Waibhav
 
 
 
Answer
# 3
Fire detector only sence the heat accured because of fire
in other side the smoke detector only sence the smoke
accured because of fire...
 
Is This Answer Correct ?    14 Yes 10 No
Nitin Diwan
 
Answer
# 4
Fire detector is a common name for all type of detectors to
find fire. Smoke detector is one type of fire detector.If
you have a smoke detector in a pantry it will give always
alarm. so there you have to fix heat detector.If you are
using a smoke or heat detector in a substation you will get
an alarm too late. So A uv detector will be better or you
can use one uv and one smoke detector. Basically all are
intended to indicate a chance of fire.
 
Is This Answer Correct ?    4 Yes 3 No
Ilyas
 
Answer
# 5
fire detectors occurs out of building but smoke detectors
inside building
 
Is This Answer Correct ?    1 Yes 16 No
Elsayem
 

 
 
 
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