Table of Contents
Introduction:
The LPG Kit installed is many times installed inside the car creating the possibility of large accidents. This type of appliance/Kits is normally unattended by any operating personnel since it is automatic in operation and, therefore, one hazard encountered in the use of such an appliance is the possibility that during a standby period or a period in which it is not in operation, a gas leak may occur thereby resulting in a large accumulation of combustible gas which can produce an explosion if the detection is not quickly noticed. Although some sophisticated detector means have been provided, it is contemplated that the indicator means should be simple and economical so that the entire system may be readily incorporated into mobile trailers, campers, boats, and other vehicles or living quarters having appliances dependent upon storage of pressurized gas.
Block diagram explanation :
Power supply unit:
This section needs two voltages viz., +12 V & +5 V, as working voltages. Hence specially designed power supply is constructed to get regulated power supplies.
Buffers:
Buffers do not affect the logical state of a digital signal (i.e. a logic 1 input results in a logic 1 output whereas logic 0 input results in a logic 0 output). Buffers are normally used to provide extra current drive at the output but can also be used to regularize the logic present at an interface.
Drivers:
This section is used to drive the relay where the output is the complement of input which is applied to the drive but the current will be amplified.
Relays:
It is an electromagnetic device that is used to drive the load connected across the relay and the o/p of the relay can be connected to the controller or load for further processing.
Indicator:
This stage provides a visual indication of which relay is actuated and deactivated, by glowing respective LED or Buzzer.
Methodology:
The system will have the Gas Detector sensor MQ3, when any leakage in gas is detected the signal is fed to buffer IC 4050, buffer stores, and given to the driver IC 2003 in driver current will amplify and voltage will invert with the help of Darlington circuit of driver IC to drive the relay his system is password protected.
Advantages:
- It also detects alcohol so it is used as a liquor tester.
- The sensor has excellent sensitivity combined with a quick response time.
- It is used in-house for LPG leakage detection.
Disadvantages:
- It works only when a 5V power supply is given.
- Its sensitivity depends on Humidity and temperature.
Applications:
- Protection from any gas leakage in cars.
- For safety from gas leakage in heating, gas-fired appliances like boilers, domestic water heaters
- For safety from gas leakage in Cooking gas fired appliances like ovens, stoves, etc
- Large industries use gas for their production.
- They are used in gas leakage detecting equipment in family, Car, and industry, are suitable for detecting LPG, iso-butane, propane, and LNG, and avoid the noise of alcohol and cooking fumes, and cigarette smoke.
