Thermal Conductivity Gas Sensor, 0～100% LEL

Buy a durable, high-performance thermal conductivity gas sensor that detects methane, hydrogen, and inert gases at 0-100% LEL concentrations, maintaining reliable performance even in extreme temperature and humidity conditions. Its robust metal housing and platinum mesh structure, combined with Exdib I Mb explosion-proof rating, make it ideal for industrial and mining environments.

Feature

• Thermal conductivity gas sensors exhibit linear bridge output voltage, excellent repeatability, stable and reliable operation, no catalyst poisoning, and capability for oxygen-free or hypoxic detection.
• It operates flawlessly within a temperature range of -40°C to +70°C and relative humidity up to 95%, with Exdib I Mb explosion-proof certification ensuring high safety standards.
• The gas sensor covers a concentration range of 0-100% LEL, accurately detecting both high and low gas concentrations. Mainly used for industrial field concentration detection of methane, hydrogen, inert gases, etc.
• Featuring a compact 19*9.5*14 mm sensor size and low power consumption ≤120mA at 3.0V, it integrates seamlessly into diverse detection systems.

Dimension (unit: mm)

Test Circuit

Note: The diagram above shows the basic test circuit for an air quality gas sensor. This sensor requires two voltage inputs: Heater voltage (V_H) and test voltage (V_C). VH is used to provide the sensor with a specific operating temperature and can be supplied by either a DC or AC power source. V_RL is the voltage across the series load resistor (R_L) of the sensor. V_C is the test voltage applied to the load resistor R_L and must be supplied by a DC power source.

Zero and Sensitivity Stability Curve

In clean air, the absolute value of annual zero drift for the thermal conductivity gas sensor is less than 2mV, and the absolute value of annual sensitivity drift (at 10% CH) is less than 2mV. For short-term storage (within two weeks), stabilization occurs within 8 hours. For long-term storage (one year), stabilization requires 48 hours of aging.

Sensor Curve

Response Recovery Curve

Sensitivity Curve