DETECTION OF LPG GAS LEAKAGE

SENSOR AND ALERT SYSTEM

U.BHARADWAJ REDDY

11361A0211

EEE-DEPT.

JPNCE

Contents:

Introduction

Block diagram

Description

Circuit diagram

Applications

INTRODUCTION

• LPG is essential in our daily life .

• Now a days the use of LPG is extended to so many

applications.

• Though it is useful if it leaks tends to explosion.

• So the leakage of this gas have to detect to avoid unnecessary

explosions.

• Here we are implementing a circuit that detects the leakage of

LPG gas and alerts the user through audio-visual indications.

• This circuit can detect leakages in our home, car or in a service

station, storage tank environment.

• This unit can be easily implemented to industrial level by

upgrading its ranges, can be extended to receive “SMS

ALERTS” by using GSM modem.

Block diagram:

•We have used MQ-6 gas sensor.

•Whenever LPG is leaked the sensor

detects and it send signal to timer circuit.

•Here we have used IC 555 timer which acts as

astable multivibrator.

•The out put of Timer given to Transistor driver

circuit which activates buzzer and LED and

alerts the user through audio-visual indications

Description:

Circuit diagram

Circuit operation:

The sensor is used to detect the LPG gas and the

OUTPUT pin of sensor module goes high .

This signal drives timer IC 555 which works as a

tone generator.

Output pin of IC 555 is connected to led1 and

speaker-driver transistor SL100 through current

limiting resistors R5 and R4,led1 glows and alarms

sounds to alert the user of gas leakage.

Applications and uses:

Security system in applications like homes,

hostels ,industries ,vehicles(LPG as fuel).

Because of its low power consumption this system

can be used in other applications like, smoke

detection and various toxic gases by doing some

modifications.