SIMPLE LPG/Butane/Propane GAS SENSOR CIRCUIT (TESTED OK)
If LPG used in kitchen is having leakage somewhere,how we come to know ? Since LPG is intentionally mixed with ethyl mercaptan for sensing gas leakage by its odor, we can suspect a leakage by its unpleasant smell. But while cooking dishes with variety of smell, recognizing the LPG smell may be little bit difficult .
Gas sensor circuits are very common nowadays but circuits having complications and confusions on sensor connections.. I have tried my best to introduce a very simple circuit, which is tested OK. Heart of this circuit is MQ 6 gas sensor, which is very sensitive for LPG ,iso butane & propane.
MQ 6 has an inbuilt heater where we have to supply 5V DC or AC for heating the coil. when coil is heat,Presence of LPG get sensed by the electrodes inside and the output goes high. This output is fed to the base of BC 548 and buzzer get ON . This is the basic theory of circuit.
Assemble this circuit and switch on the power.first we have to set the preset to hear the buzzer sound in the absence of LPG. then slowly rotate the preset PRECISELY to just eliminate the buzzer sound. Now light up a cigaratte lighter( cigarette lighter use butane) and blow off the flame with pressed condition.Bring the lighter (without flame) near the sensor. you can hear the buzzer beep loudly.Check with LPG also for fine tuning of preset .
if look at MQ 6 may lead you confusion because of its 6 pins .Actually 4 pin outs is sufficient for this ckt.
(ref picture.) leads A and A to be shorted . B and B to be shorted.H and H is the heater pins,where polarity is not an issue. AA and BB also can inter change. Only 4 pin outs to be used for the circuit.
given ckt is proved one(see video) and if you change the value of components or voltage or current, this circuit may not function.More over, MQ 6 sensor voltage should not exceed 5.1 voltage in any situation.
Where we can procure MQ 6 sensor? You can ask any electronic component dealer or you can get it by online shopping.( eg: www.electroncomponents.com)This costs around 150 - 175 Indian Rupees.
For the power supply of this ckt, I have used an
old mobile charger with 6V ,800mA as the power supply . When the LPG concentration in air is 200 to 10000 ppm(particle per million), sensor will detect and trigger the transistor .Preset adjustment is very important in this circuit. When gas is switch off,then also buzzer remains on for few seconds or may be 1- 2 minutes, Do not try to connect additional relay in this ckt because chance of spark between relay contact may leads to fire . In the video, buzzer hole is blocked because of its ear piercing sound irritation during my trials.sensor is kept around 30 cm away from burner and within 6-7 seconds buzzer statrts beeping.
Thanks & Regards
Vineesh Kodambattil
If LPG used in kitchen is having leakage somewhere,how we come to know ? Since LPG is intentionally mixed with ethyl mercaptan for sensing gas leakage by its odor, we can suspect a leakage by its unpleasant smell. But while cooking dishes with variety of smell, recognizing the LPG smell may be little bit difficult .
Gas sensor circuits are very common nowadays but circuits having complications and confusions on sensor connections.. I have tried my best to introduce a very simple circuit, which is tested OK. Heart of this circuit is MQ 6 gas sensor, which is very sensitive for LPG ,iso butane & propane.
Assemble this circuit and switch on the power.first we have to set the preset to hear the buzzer sound in the absence of LPG. then slowly rotate the preset PRECISELY to just eliminate the buzzer sound. Now light up a cigaratte lighter( cigarette lighter use butane) and blow off the flame with pressed condition.Bring the lighter (without flame) near the sensor. you can hear the buzzer beep loudly.Check with LPG also for fine tuning of preset .
if look at MQ 6 may lead you confusion because of its 6 pins .Actually 4 pin outs is sufficient for this ckt.
(ref picture.) leads A and A to be shorted . B and B to be shorted.H and H is the heater pins,where polarity is not an issue. AA and BB also can inter change. Only 4 pin outs to be used for the circuit.
given ckt is proved one(see video) and if you change the value of components or voltage or current, this circuit may not function.More over, MQ 6 sensor voltage should not exceed 5.1 voltage in any situation.
Where we can procure MQ 6 sensor? You can ask any electronic component dealer or you can get it by online shopping.( eg: www.electroncomponents.com)This costs around 150 - 175 Indian Rupees.
For the power supply of this ckt, I have used an
old mobile charger with 6V ,800mA as the power supply . When the LPG concentration in air is 200 to 10000 ppm(particle per million), sensor will detect and trigger the transistor .Preset adjustment is very important in this circuit. When gas is switch off,then also buzzer remains on for few seconds or may be 1- 2 minutes, Do not try to connect additional relay in this ckt because chance of spark between relay contact may leads to fire . In the video, buzzer hole is blocked because of its ear piercing sound irritation during my trials.sensor is kept around 30 cm away from burner and within 6-7 seconds buzzer statrts beeping.
Thanks & Regards
Vineesh Kodambattil
hello sir,
ReplyDeleteif i assemble this circuit,what is the use of the circuit?
your question seems strange. Any way I will explain the major use in house.Many of our LPG regulators having minor leakages,that cannot be detected easily. You may notice the cylinder getting empty as fast,even you not use LPG more .ie,you are simply wasting the gas.by this circuit you can even detect a minor leakage. bring it near the regulator valve and on the valve. if a minor leakage is there, you can hear alarm..
DeleteI want to use 9V battery as input voltage. What are the changes required in the circuit, please advise?
ReplyDeleteHello.
ReplyDeleteThanks for the excellent contribution.
I am for build the circuit, I wonder if I can confirm the value (ohms) of the resistor that you marked as "33 E".
Greetings.
33 ohms
ReplyDeleteis it 6v buzzer
ReplyDeleteI USED 12 VOLT BUZZER. 6 VOLT ALSO WORK.
DeleteHow can we know which two pins(both shorted) are A and which two pins(both shorted) are B? because tey are identical. Please tell me how to identify them?
ReplyDeleteAA & BB ARE INTERCHANGABLE. PICT SHOWN IS AA AT LEFT SIDE. U CAN INTER CHANGE BB AT LEFT SIDE ALSO. EITHER AA PAIR TO GIVE + SUPPLY AND OUT PUT TO TAKE FROMM BB. OR BB PAIR TO GIVE + SUPPLY AND FROM AA TO TAKE OUTPUT. BOTH ARE SAME HOPE U R CLEAR....
ReplyDeleteTHANKS
Sir, I have made the circuit and when I tested it, it was continuously beeping.......it did not stop until i switch off the power. I adjusted preset also very slowly and precisely, but the buzzer did not stop beeping though there is no gas leakage at all. I tested the circuit in different places too.....but it did not work. Please help me how to troubleshoot it.....
ReplyDeleteRegards.
Actually it is tested ok.pls see vdo.try to short 10 k and increase preset value,say 100k.
ReplyDeleteWow sir......it worked!!! I used a 100K preset in place of 10K preset and shorted the 10K resistor exactly as you told me............it works perfect now!......thank you for such a great circuit
DeleteRegards.
always welcome
Deletedear Mr sskopparthy, IT IS NOT FAIR TO COPY AND PUBLISH MY OWN CIRCUIT IN SOME OTHER BLOG AS YOUR CIRCUIT ,WITHOUT ANY PERMISSION .JUST READ THE LEGAL TERMS BELOW MY BLOG PAGE. COPYING OR DUPLICATING MY CIRCUITS WITHOUT PERMISSION IS STRICTLY PROHIBITED. SO EITHER REMOVE THE CIRCUIT, FROM THAT SITE OR INCLUDE REGARDING THE AUTHORITY OF CIRCUIT ,WHICH IS FROM MY BLOG. Failing to do so ,I wil move with further legal actions .Copying is so simple, just think about my efforts for developing own circuits. awaiting reply
ReplyDeleteThis comment has been removed by the author.
DeleteThis comment has been removed by the author.
DeleteSir, I have not seen that term and condition below you blog. I will remove the post soon from that blog.....please give me some time as I am not the owner but a contributor to it.
Deletedear Mr sskopparthy,
Deleteit is more than 6 days now, as per you committed. still it is remaining in that blog.remove it from that blog or add the matter regarding the authority of that circuit in that article. else you can face the legal consequences.
sir ,
ReplyDeleteI have seen this circuit in homemadecircuits blog,and just supposed to inform you. Nice cheating. any way you catch this in red hand.don't leave that fellow.We all support.
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The Portable LPG Gas Leak Detector is truly a lifesaver when it comes to ensuring the safety of your home or workplace. Its compact size and reliable performance make it the perfect tool to quickly detect any potential gas leaks and give you peace of mind.
ReplyDelete