Here is a gas leak detector circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is used to convert 9V into 5V DC to drive the gas sensor module.
The gas leakage circuit uses the SEN-1327 gas sensor module from RhydoLABZ. Its output goes high when the gas level reaches or exceeds certain point. A preset in the module is used to set the threshold. Interfacing with the sensor module is done through a 4-pin SIP header.
Pin details of the gas sensor module are shown in Fig. 2. An MQ-6 gas sensor is used in the gas sensor module. The sensor can also be used to detect combustible gases, especially methane.
Gas leak detector schematic
SEN1327 gas sensor pin details and picture
Whenever there is LPG concentration of 1000 ppm (parts per million) in the area, the OUT pin of the sensor module goes high. This signal drives timer IC 555, which is wired as an astable multivibrator. The multivibrator basically works as a tone generator.
Output pin 3 of IC 555 is connected to LED1 and speaker-driver transistor SL100 through current-limiting resistors R5 and R4, respectively. LED1 glows and the alarm sounds to alert the user of gas leakage. The pitch of the tone can be changed by varying preset VR1. Use a suitable heat-sink for transistor SL100.
very nice project. Thanks for posting.
with regards,
Jai Sudan.
will i get this 4 – pin gas sensor in my local area??
or i should take it from net???
Bhavin, you may get 4 pin assembled module from http://www.rhdolabs.com or have a look at the project list from http://www.united77.com who have similar project based on LM324. I have bought one from United and is working fine.
hai shuruthi how r u? where are you doing your degree.
i am sasi from ACTECH.
sir very important project,,,,,,,,thanks for shearing…………
if you’ve this project report please please send me this because i’ve alredy done this project
please send me project report on Gas Leakage Detector
sir please tell me out of the 6 pins of mq-6,which 4 do i need to use??
Mq-6 is the material name of this sensor.mq-6 material is semicircle shaped material..you need SEN1437 to use the gas leakage circuit…
SEN1437 has four pin component.first pin is OUTPUT,second pin is ANG,third pin is VCC,last one is GND…
Sorry,i mistake on this post..sensor is SEN1327..
Its very important project.,very nice…
I have prepared this detector…its most useful in home..
sir,could this gas leakage detector detect the type of gas N.G.V ? , FOR CAR USES.
sir i’ve used MQ-6 gas sensor.but no 4 pin sip header.so i soldered the sensor & take the pins.as soon as switch is closed alarm sounds.whats the problem? kindly reply me.
but sir this sen-1327 is not available in market….only 6 pin sensor is available..so what do i do??
Where can I found SEN-1327? Pls reply..
if gas leaks and when the ckt gets triggered,there is possibility of spark.!!
nice and useful project & i want many project…….
HOW MUCH IT(SEN1327) COSTS???
can i use this circuit with gsm sms sending circuit
this project is very good.
a have an answer.dose this circut detect a cng gas????(cng=home usable gas)
hi pls i bought an mq-2 gas sensor could you pls email me how to connect it with this circuit
It is an excellent project in view of security. Please let know shall I get the Sensor MQ-6 freely or let me inform where can I purchase.
Than Q
i didn’nt get sen 1327 gas sensor in warangal(A.P).from wer i can get it?
where i can get mq-6 & 1327 sensor.. how much is the cost of entire circuit… pls pls pls reply…
very nice project thanks for posting
can u plz tell the approx price of SEN1327
i already have this gas sensor how to connect this circuit is it need gas cylinder to get the output of this ckt
Test with unlit propane torch or gas stove burner.
sir ,Gas leakage alarm praticaly implement which type problem faced,plz gives the solution.thanks
nice projecttttttttt…….
hellow!! can i replace mq 6 to mq 7???is that okay?
sir is this a multi gas detector,. ist can detect methane, carbon dioxide, and nitrogen???
gas sensor has 6 terminal so tell me how can i connect this in circuit ? becoz in circuit their is only give 4 terminal
sir i want to get the circuit diagram with proper specification of lpg sen-1327 or mq-6 gas sensor.
please help me;;;
Does anyone know how the values of the resistors and capacitors were designed? Can you post the calculation please.
sir plz send kv(low ampere) voltage tripler ckt diagrma
nice project
whats price for this leak detector
may i know what is the use of zener diode in this circuit?
may i know how the transistor is used in this circuit?
The transistor is simply an amplifier that drives the loudspeaker.
hi sir,
its the best project and i am using the same project now for my graduation project.. our teacher told us to add a display unit to see at which range the sensor will detect and gives alarm.. i have used MQ-6 instead of SEN1327 and its working very good.. but i have some difficulty in making the project report and getting out the spicifications of this circuit.. so please can you help me with that i have only 2 more weeks to submit my project and without these things i will fail