Winsen MR007 Hot Wire Combustible Gas Sensor For Household Leakage Alarm

Combustible as leakage in home use is always a concerned issue in daily life. To avoid tragedies and property loss, many governments are pushing the installation monitoring and alarm device in every kitchen, along with increased safety methods like auto valve, metal gas pipe, etc.

The gas alarm is an sensitive device to detect early gas leakage concentration and trigger alarm when reaching certain level. It’s an effective method to prevent gas leakage accidents.

In the kitchen, cooking wine, vinegar and other condiments used in the cooking process will produce ethanol and acetic acid, coupled with complex cooking methods such as steaming, boiling, and frying, resulting frequent encountering the problem of false alarms in practical use, and then doubting the performance and quality of gas alarms.

From a technical point of view, the main reasons for the false alarm come from the core sensitive gas sensor, the hardware circuit design and the software processing program. The main reasons for false alarms caused by sensors are poor anti-interference, poor temperature resistance, poor humidity resistance and poor long-term stability. Therefore, choosing a gas sensor with superior performance can directly and effectively reduce the false alarm rate.

Compared with the traditional indirect-heated gas sensor, the hot wire gas sensor receives very little influence of the ambient temperature and humidity, so that the reliability o is greatly improved. This is mainly because the hot wire gas sensor is composed of a sensitive element and a compensation element. Due to the existence of the compensation element, the influence of water vapor on the output signal has been compensated to a certain extent, so that the element has excellent performance against humidity interference.

Having different structure and different gas-sensing mechanisms, the requested performance of gas-sensing materials is higher. Winsen has mastered the hot-wire gas sensor manufacturing process in 2007. After more than 10 years of technical precipitation, it has launched a high-performance gas sensor MR007 for household gas alarms, providing a new choice for high-end household gas alarms.

The hot wire gas sensor MR007 newly launched by Winsen adopts the MOS nano-microporous ultra-stable structure based on the grid distribution and the bound catalyst doping loading technology for increased stability, high accuracy, high sensitivity, great linearity and repeatabililty. It keeps the long life feature of semiconductor sensor, and improved in false alarm.

Work principle

MR007 hot wire gas sensor is composed of a test element and a compensation element. The resistance of the test element changes with the change of electrical and heat conduction produced by the adsorption of combustible gas on the surface of sensitive materials, so as to measure the gas concentration. The detection circuit adopts a Wheatstone bridge, which is composed of a detection element and a compensation element paired to form an arm of the bridge. When a flammable gas is encountered, the resistance of the detection element decreases, and the output voltage of the bridge changes. The voltage change increases with the increase of the gas concentration. The compensation element acts as a reference and temperature compensation.

Product Features

  • Excellent resistance of Silicon, H2S, cooking smoke, alcohol, vinegar, etc. Meeting different use conditions of combustible gases.
  • Compliant with the latest Chinese standard GB 15322-2019 and international requirement.
  • Great cost and first choice for high end household gas alarm.
  • Super low false alarm, solving the pain point of inspection failure at user end.


Sensor model MR007
Sensor type Hot wire gas sensor
Application Combustible gas leakage detection(natural gas/LPG gas/ coal gas)
Encapsulation Steel cap+plastic base
Working voltage (V) 2.5±0.1
Working current (mA) 150±10
Zero Point (mV) ±30
Sensitivity (mV) 20%LELMethane CH4 12~45
20%LELPropane C3H8 10~30
Measurement range (%LEL) 0~100
Response time (T90) ≤10s
Restore time (T90) ≤30s
Working temperature humidity -40~+70℃, <95%RH
Storage temperature humidity -20~+70℃, <95%RH
Life 5 years