Home Combustible Gas Alarm
The combustible gas alarm is an alarm device for detecting gas leakage. The component that reacts to the combustible gas is a gas sensor, and the response signal is converted into an electrical signal through the circuit board. When the combustible gas in the air reaches a certain concentration value, the alarm will alarm. The high-end household combustible gas alarm can automatically start the exhaust equipment and close the gas pipeline valve at the same time. A wireless transmission device can be installed inside the gas alarm to realize overall monitoring and network alarm to ensure the safety of everyone's life and property.
There are two hazards of gas leakage: one is leakage, combustion and explosion, and the other is personnel inhalation poisoning; among the two hazards,the prevention of combustion and explosion is the top priority.
Health is as important as safety
Traditional home combustible gas alarms only sound on-site when there is a serious gas leakage, but in fact, or carbon monoxide concentrations exceeding the standard caused by gas leakage or incomplete combustion often occur.Although this situation does not cause the same danger as an explosion, it can seriously endanger our health over many years.
▲ME2-CO CO Sensor
Winsen ME2-CO electrochemical sensor can accurately analyze the concentration of colorless and odorless combustible gas and carbon monoxide. When the gas concentration is abnormal, the sensor will immediately give a response signal,
which greatly improves the user's vigilance and prevents problems before they occur. Carbon monoxide is a colorless, odorless, non-irritating gas that cannot be sensed by human. The maximum concentration that a healthy adult can bear within eight hours is 50ppm. When the concentration is 800ppm, dizziness, nausea, and spasm within 45 minutes, loss of consciousness within 2 hours, death within 2-3 hours. Winsen electrochemical sensor detects the concentration of carbon monoxide between 0-1000ppm, and the maximum measurement limit can reach 2000ppm. It can effectively and timely feedback concentration data, prevent carbon monoxide poisoning, and protect health and safety.
The combustible gas sources in people's lives are roughly divided into: liquefied gas (LPG),natural gas,coal gas (LPG) and other alkane combustible gases, etc.
The current gas detection methods for the combustible gas industry are:
Home combustible gas is mainly detected by semiconductor and planar semiconductor components. At present, domestic products occupy the mainstream market, mainly measuring 0-10000ppm. Municipal gas companies mainly use catalytic components, mainly measuring 100% LEL. Mainly used for gas storage, transportation, pipeline safety inspection and other places. After 2007, high-end gas detection products in the gas industry have gradually adopted infrared gas sensors, which can measure 100% LEL and 100% VOL.At the same time, the laser beam technology is used in the gas industry, especially in the long-distance inspection.
Liquefied Petroleum Gas (LPG)
▲ MQ-5 propane sensor
The main components are ethylene, ethane, propylene, propane and butane, etc., which are liquid in the gas cylinder. Once they flow out, they will vaporize into a flammable gas that is about 250 times the original volume. It is easy to spread and will burn or explode when encountering flame. If this kind of liquefied gas is used, it is necessary to select an alarm equipped with a propane sensor in a targeted manner.
Natural gas is an important energy source and is widely used as city gas and industrial fuel.
▲MP-4 methane sensor for
Natural gas is one of the safer gas. It does not contain carbon monoxide and is lighter than air. Once it leaks, it will spread upward immediately, and it is not easy to accumulate to form an explosive gas, so it is safer. The main component of natural gas is methane, which is generally transported by pipelines. Therefore, for safety, most cities now use natural gas for supply. When using natural gas, it is necessary to select an alarm equipped with a methane sensor detection module.
Although artificial coal gas (coking gas) is currently used less, it is still used in some areas.It is necessary to select a hydrogen sensor if use coal gas.
Coal gas is made by dry distillation or vaporization of solid raw materials such as coal or coke, and its main components are carbon monoxide, methane and hydrogen. The working pressure of coal-made gas is 1.0KPa, and the gas supply method is generally pipeline.
▲ MQ-8 sensor for
Winsen Technology is suitable for the detection of combustible gas such as liquefied gas, natural gas,coal gas, etc. After years of development, gas sensor technology has become very mature. Sensors and modules such as MP series planar semiconductor gas sensors, MC100 series carrier catalytic gas sensors, and MQ series semiconductor gas sensors are widely used in household gas leak detection.
Attached table: sensor selection of gas detection in combustible gas industry
|Model||Test object||Measurement range||Picture|
|semiconductor sensor||MQ series（MQ-2、MQ-4、MQ-5、MQ-6 etc.）||Various combustible gases||300-1000ppm|
|Planar Gas Sensor||MP series（MP-4、MP-5）||Various combustible gases||300-10000ppm|
|Catalytic gas sensor||MC series（MC101、MC102、MC105etc.)||Various combustible gases||0-100%LEL|
|Catalytic gas sensor||MC series（MC112、MC113、MC114）||Various combustible gases||0-100%LEL|
|Thermally Conductive Gas Sensors||MD series（MD61）||Various combustible gases||0-100%VOL|
|Infrared Gas Sensor||MH4 series（MH-440D）||Various combustible gases||0-100%VOL
|Infrared Gas Sensor||MH7 series（MH-741）||Various combustible gases||0-100%VOL
Sensitive material of MQ-5 gas sensor is SnO2, which with lower conductivity in clean air. When the target flammable gas exist, the sensor' s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-5 gas sensor has high sensitivity to butane, propane, methane and can detect methane and propane at the same time. It also can detect kinds of flammable gases, especially LPG(propane). It is a kind of low–cost sensor for many applications.
Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target flammable gas exist, the sensor’s conductivity gets higher along with the gas concentration rising.Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-2 gas sensor has high sensitivity to propane and smoke, also can detect the natural gas and other flammable steam well. It is with low cost and suitable for different applications of detecting kinds of flammable gases.
Sensitive material of MQ-7B gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO at low temperature (heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature (heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
MP-2 model with advanced planar construction is comprised of heater and metal oxide semiconductor material of subminiature Al2O3 ceramic plate, fetch out electrode down-lead, encapsulation in metal base and cap. When the target gas exists , the sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, convert change of conductivity to correspond output signal of gas concentration.
MEMS smoke gas sensor is using MEMS micro-fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. The higher the concentration of the gas, the higher the conductivity. Use simple circuit can convert the change of conductivity of the gas concentration corresponding to the output signal.
MEMS combustible gas sensor is using MEMS micro- fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. The higher the concentration of the gas, the higher the conductivity. Use simple circuit can convert the change of conductivity of the gas concentration corresponding to the output signal.
How to choose the right sensor for your project?
We have 17 sensor series, 200+ categories, and 300+ detection objects for gas detection. Such as CO, CO2, VOC, PM2.5, CH4, LPG and so on. In particular, we also have MEMS sensors. According to your industry application, gas principle, power consumption, accuracy, and range requirements, and we can select a specific model for you. You can also use the product filter below to choose a suitable product, or choose online serivce.
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