Hi.....
i am a student of third year ece.
i am from coimbatore of tamilnadu.
i wish to do a project.
i am havimg only the idea,but i don,y know how to implement it.
the idea is that
when there is a leakage of any gas from a company or a gas from a house, the electric circuit should be breaked and the current should be shut down.in addition to that an alarm should be made outside the house.
i found that the necessary components are not available here in the market.
i require u'r(s) suggestions of what components to be used and where to get the components.
thank you,eagerly waiting for u'r(s) reply(ies).
your's
kaliselvan.s.

 

What kind of gas are you going to be detecting? Propane?

 

thank u for u'r reply sir!
first we thought of any poisonous gas.
but now we have decided that our project will detect only lpg gas!!!!!!
so please tell the neccesary steps to be taken!
thank u!!!!

 

dang, I saw something like that not too long ago.

the parts and even pre-made devices "do" exsist. I think one I saw was at walmart (large department store) - it was for using with mobile trailers and RV's ... propane gas leak detector... would sound an alarm if it smelled propane.

I also saw a sensor module for detecting several different hydrocarbon gases (lpg, natural, etc)... but I dont' remember where I saw it now.

google for it ... the answer is out there...

http://www.google.com/search?num=20&...+leak+detector

 

Theres all kinds of sensors. Solid state, electrostatic,electro-chemical, Infra Red, Laser. Depends on budget and your design.

sensor seek on google:
http://www.google.com/search?hl=en&i...=Google+Search

Some products:
http://www.zelana.com/product_groups..._benefits.html

When you have your design settled , which is basically a low voltage sensor driving a amplifier stage to a comparator ( to give you a "window" of detection range ) driving an output device. I recommend you use a solid state relay as your shutoff supply switch as we don't want any sparks from a regular relay , do we ?

Example here:
http://www.mpja.com/productview.asp?product=12808+RL

 

My RV is equipped with a sensor designed to indicate propane or LPG leakage. It also wakes me up when the dog sleeps too close to it - methane I presume.

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stevez