Winsen MC109 Catalytic Flammable Gas Sensor - Metal Mesh Encapsulation

The MC109 requires a precise 2.5V ±0.1V DC supply to power its catalytic bridge. The typical working current is 100mA ±10mA. It is critical to use a stable, regulated power source within this range to ensure accurate readings and prevent sensor damage.

The sensor provides a linear analog voltage output from an unbalanced Wheatstone bridge. The voltage change is directly proportional to the concentration of combustible gas present, expressed as a percentage of the Lower Explosive Limit (%LEL). This signal typically requires amplification and conditioning by a dedicated transmitter or controller module.

The MC109 is designed to detect a broad range of flammable gases and vapors within the 0-100% LEL range. This includes hydrogen, acetylene, gasoline, and common VOCs such as alcohols, ketones, and benzene. Its catalytic bead is sensitive to most hydrocarbons that undergo combustion.

The active test element contains a catalyst that causes combustible gases to oxidize, heating the element and changing its resistance. The passive compensate element is inert and does not react to gas. It serves as a reference to cancel out signal changes caused by ambient temperature and humidity variations, ensuring a stable and accurate measurement.

Yes, its metal encapsulation and sintered powder mesh provide mechanical robustness and act as a flame arrester. With an operating temperature range of -40°C to +70°C and resistance to common poisons like H2S, it is built for demanding industrial applications, including outdoor monitoring stations and harsh process areas.