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[KBIO]

Hello!
As things are getting thougher in our meeting , nowadays, and safety devices are more  & more required by insurances to prevent accidents, it has lead to  friends of mine to design a "Gas Safety Shut Off Module , that I'd like to show you here.
I found it smart and reliable enough to present it and maybe you'll find some interest in it.
This set is small , easy to built and cost virtually nothing. You may like it.

Easy to work out:
When the sensor sniff a molecule of gas or alcool, it sends a signal to a servo which close the gas supply valve. Switching off the burner.
A Black Push  button switches the module ON (standing by) and let the gas passing. As soon as the sensor detects a leak, a buzzer sounds hard and a light is flashing at the same time as the servo receives the order to shut off the gas valve.
To reset the module, we need to push the green  button : ir will send a signal to the servo to cancel the order to close it.
It comes back in open position and the burner can be switched on ,again.
Only 80mA is required to make the thing works.
 
My friends Pascal and Francis  will be ready to answer to any question and help you out to make one if you are wish.
(contact me in PM to get their personnal datas)
Thanks and regards!

Photo 1 : module standing by and servo opened


Photo 2 : light  & buzzer on and servo closed


The module with automatic electro-valve.

[john s 2]

Thanks for posting. the big question is how sensitive it is. The location of the sensor will effect its efficiency. The other device that comes to mind is the thermocouple, working a flame failure shut off. Unlike your system this would only switch the gas off in a flame failure situation. Please let us all know how it works as its a step foreward in safety. John.

[KBIO]

Hello John!
Thanks for your interest.
What I can say is:
The sensibilty of the sensor is 10000PPM (+/- 5% depending on T° and humidity) .
It is an MQ6 from www.hwsensor.com
The sensor can be placed 10/15 cm away from the burner and 2cm higher than the bottom.
Test has been done and it takes only 1 to 2 seconds before it works!
The sensor is so sensitive  , that an alcoholic breath , will be sufficient to switch it on.
The thermocouple has been abandoned for technical and financial reasons.

For sure, a good simple & neat installation in an open launch is the safiest way to sail, but as we add more and more components  in closed boats , we mutiply the risk of a leak .
The interest I see in this module is when some un-burned gas is detected in the bottom of a tug for example.
ie: leak in the line from tank to the burner. It shuts off the system before this gas goes to the flame and fires the boat.
If , for example, the burner is switched off by the wind , like it happens sometime, the gas flows but there is no more flare, so , there is no risk of fire and no need for the module .
My experience of fire that I have seen in boats was coming  from solid connections (metal to metal)  that ends up to leak, or a loose connection after filling up  or default on valve, or other item in the line (regulator,...).
Everything is fine, the boat sails  well ; but for any reason , the gas leaks &  falls down the bottom until it get in contact with  the flame. FIRE!
The goal of the sensor is to prevent this.
Regards!

note; I shall try to pass the different links and schems on the forum

[john s 2]

Thank you i look forward to your postings.John

[america12mj]

hy guy's ,you can see the video about the "SECUGAZ" here

http://www.youtube.com/watch?v=8-LZvV6mKXs

if you have some question , you can send a mail in my box.
my English is poor , but i can use ,google translator!
regards
pascal