ABSTRACT

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. By providing a GSM modem we can receive “SMS ALERTS” also..

Design Of the 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 U:

S.no

Components used

Range/Type

Quantity
1

SEN-1327 gas sensor

200ppm-10,000ppm

1no
2

IC 555 TIMER (8 pin)

4.5 to 15 V(Vcc)

1no
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

2no
9

Resistors




Variable resistor

10kΩ
4.7kΩ
1kΩ
22 Ω
560Ω
10kΩ

1no
1no
1no
1no
1no
1no
10

On /off switch and Connecting wires

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CIRCUIT DIAGRAM:












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:

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

Circuit Working:
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 5