Presentation Major, gas leakage detector
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Transcript of Presentation Major, gas leakage detector
PRESENTATION
Submitted By:-
SANCHIT BATRA
08502944
SANCHIT GARG 08502947
The ‘Combustible Gas Detector’ with the help of ‘MQ2 Gas Sensor’ is
successfully detecting the presence of Liquefied Petroleum Gas (LPG)
gas. MQ2 gas sensor was used to detect LPG at room temperature as
well as ±100 C of room temperature and the output voltage was noted.
The project, detects the gas, identifies if it is more than the required
amount or not and if it is so then it raises an alarm and a red LED
blinks.
BEFORE T2:
Choosing a suitable sensor, procurement of various measuring instruments
and then assembling the test circuit. Test is to be performed on sensor for
LPG at room conditions.
AFTER T2:
To make an interface with the sensor, so that the sensor could be practically
used to detect LPG.
The interface is designed in such a way that it alerts the user if the intensity
of gas increases by a certain amount.
The MQ-2 gas sensor is sensitive to LPG, alcohol, etc. The resistance of the
sensitive component changes as the concentration of the target gas changes.
Sensitive material of MQ-2 gas sensor is SnO2, which with lower
conductivity in clean air. When the target combustible gas exist, the
sensor’s conductivity is more high along with the gas concentration rising
that changes the conductivity to correspond output signal of gas
concentration. It can work from -20oC to 50oC at relative humidity of less
than 95%.
TEMPERATURE CONCENTRATION OF GAS OUTPUT VOLTAGE
34 C LOW 0.61 v
34 C HIGH 3.20 v
26 C LOW 0.70 v
26 C HIGH 3.01 v
14 C LOW 0.63 v
14 C HIGH 2.82 v
DOMESTIC GAS LEAK DETECTOR
The MQ2 gas sensor senses the gas and its output is send to the comparator
and the decision is taken. If gas is leaking then logic one is send to the
microcontroller and then red led blinks and a buzzer is sounded. If gas is
not leaking then green led glows. There is a LCD screen that displays the
condition of the room.
MICROCONTROLLER
REGULATED POWER SUPPLY LCD DISPLAY (OUTPUT)
MQ 2 GAS SENSOR (INPUT) BUZZER (OUTPUT)
COMPARATOR
The low-power Atmel 8-bit AVR RISC-based microcontroller
combines 8KB of programmable flash memory, 1KB of SRAM,
512K EEPROM, and a 6 or 8 channel 10-bit A/D converter. The
device supports throughput of 16 MIPS at 16 MHz and operates
between 2.7-5.5 volts. It has 23 programmable input-output lines.
The LM358 series consists of two independent, high
gain, internally frequency compensated operational
amplifiers which were designed specifically to operate
from a single power supply over a wide range of
voltages. Operation from split power supplies is also
possible and the low power supply current drain is
independent of the magnitude of the power supply
voltage.
We are using LM 358 as comparator to compare the sensor’s output with reference output.
2) PORTABLE GAS DETECTOR
i) Confined Space Entry: The instrument can be used to check the
level of gas in sewers, tanks and other vessels before entering:
• Public utilities - especially water and telecoms
• Chemical and petrochemical - for entry into vessels
• Cabling contractors
• Piling contractors
• Tunneling contractors
• Civil engineers
• Landfill operators
1. The project can be combined with GSM based module to SMS the
user of a potential gas leak as well as gas leak in actual.
2. A robotic arm can also be joined to microcontroller to automatically
close the gas cylinder.
3. The project can be made for other application of gas sensor as well.
4. The sensor can be tested for smoke and can also be used as a smoke
detector and fire fighting equipment.
1. Gas sensors: principles, operation, and development by Giorgio Sberveglieri.
2. Evaluation and applications of gas sensors by Hung Viet Cao, The University
of Texas at Arlington. Electrical Engineering
3. Solid State Gas Sensing by Elisabetta Comini, Guido Faglia, Giorgio
Sberveglieri.
4. 8051 microcontrollers: an applications-based introduction by D. M. Calcutt,
Frederick J. Cowan, G. Hassan Parchizadeh.