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What is the difference between fire detector and smoke 
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
# 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
# 2
fire detector senses the infrared rays where as smoke
detector senses aerosol .
Is This Answer Correct ?    18 Yes 10 No
# 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
# 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
# 5
fire detectors occurs out of building but smoke detectors
inside building
Is This Answer Correct ?    1 Yes 16 No

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how can we understand about dcs "bailey infi 90 dcs system" . how its work how signal come from field how it process and how o/p creative by controller. how its cards work.the bsic principle of working of dcs   1
What is DCS? GAIL 3
where do you give the 4-20 ma i/p in a MIL control valve? Siemens 3
is here anybody who knows how to calibrate the pressure transmitter? ONLINE   5
why we are using negative range like -750 to 0 mmwc in closed tank?and what is the reason can you explain clear? Aarvi-Encon 2
What is the function of SMPS   2
what is HVAC?   1
In most process, speed of motor controlled by control system with a reference pot . Now if i start & it becomes uncontrollable, i.e.gets directly start & stop after certain time.Then which reasons can make such problem? can motor may be faulty?how? Siemens 3
i have 20 kw motor & my vfd drive capcity is 18 kw if possible to use 20kw motor on this vfd?   3
how to convert transmitter milliamps output to like temp,pressure etc.....   5
why 4 to 20 ma? why cant some other range?   2
For more Instrumentation Interview Questions Click Here 

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