Gas Leakage Alarm Mini Project







Gas leakage alarm Mini Project is a Live Real time Project designed at low cost with high accuracy. It is easy to implement. This is very much cost effective when compared to other devices in online. This Project is designed to detect the LPG Gas Leakages and to alerts the users through Audio-Visual Indications. This Project is designed to detect the LPG& 4 other Dangerous Gases from a range 200 to 10,000 PPM. Whenever there is LPG concentration of 1000 ppm (parts per million) in the area. A buzzer is connected to produce audible alert signal. This LPG Gas Sensor can be used to make wireless Gas leak detector in home security system .The LPG Gas Sensor Module is designed to enable LPG detection interface to Microcontroller without ADC Channels.

Image of Final product


LPG gas is supplied in pressurized steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement. This can cause fire or suffocation if not dealt with. Here is a circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. This LPG Gas Sensor (MQ6), ideal sensor for use to detect the presence of a dangerous Liquefied petroleum gas (LPG) and it has high sensitivity to propane, butane, isobutene, natural gas. The sensor can also be used to detect combustible gases, especially methane. This circuit can detect leakages in your Home, car or in a service station, storage tank environment. This unit can be easily implemented to industrial level by upgrading its ranges.
This project is designed to detect the LPG from 200parts per million (PPM) to 10,000 PPM. 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. A buzzer is connected to produce audible alert signal. This LPG Gas Sensor can be used to make wireless Gas leak detector in home security system .The LPG Gas Sensor Module is designed to enable LPG detection interface to Microcontroller without ADC Channels.

Design Of Gas leakage alarm Project:


In this project we have used MQ-6 gas sensor. Whenever LPG gas is leaked the sensor detects and it passes signal to timer circuit. Here we have used IC 555 timer which acts as astable multivibrator.Then it will be given to Transistor driver circuit which activates buzzer and LED and alerts the user through audio-visual indications.

Components used in Gas leakage alarm Project:

1. SEN-1327 gas sensor 200ppm-10,000ppm 1no
2 IC 555 TIMER (8 pin) 4.5 to 15 V(Vcc)
3 Transistor SL100 1no
4 Zener diode 5V 1no
5 Speaker 0.5W,8 Ω 1no
6 Battery 9V 1no
7 LED 1V 1no
8 Capacitors 0.1uf
9 Resistors - Variable resistor 10kΩ
4.7kΩ
1kΩ
22 Ω
560Ω
10kΩ
10 On /off switch and Connecting wire

Circuit Diagram of Gas leakage alarm Project




SEN-1327 GAS Sensor Module


The SEN-1327 gas sensor module from RhydoLABZ,kochi is used in this circuit. This LPG Gas Sensor (MQ6), ideal sensor for use to detect the presence of a dangerousLiquefied petroleum gas (LPG) and it has high sensitivity to propane, butane, isobutene, natural gas. The sensor can also be used to detect combustible gases, especially methane. This sensor has a high sensitivity and fast response time. The drive circuit is very simple. This circuit can detect leakages in your Home, car or in a service station, storage tank environment. This unit can be easily implemented to industrial level by upgrading its ranges.

FEATURES of LPG Gas Sensor

• Uses the MQ-6 LPG Gas Sensor
• Easy SIP interface
• Compatible with most microcontrollers we can upgrade this to provide SMS alerts also
• Onboard Status and Power LED
• Onboard Pot for threshold setting
• On board microcontroller
• This sensor has a fast response time
• Good sensitivity to Combustible gas in wide range
• Long life and low cost
• Simple drive circuit
• High sensitivity to Propane, Butane and LPG

Working of Gas Leakage Alarm

Pin details of the gas sensor module are shown in Fig. 2. An MQ-6 gas sensor is used in the gas sensor module. As per its datasheet, it has high sensitivity to propane, butane, isobutene, LPG and natural gas. The sensor can also be used to detect combustible gases, especially methane. This circuit has been tested with LPG gas and was found to work very fine. Whenever there is LPG con-centration 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 resis-tors 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.


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