Low-power sensor node for the detection of methane and propane

The detection of flammable gases is necessary to avoid explosive atmospheres. For this reason, low-cost pellistors are frequently used. However, such commercial pellistors require an operation temperature of 450 degrees C or more for the detection of methane and a correspondingly high power consumption. We present a novel wireless low-power catalytic gas sensor system based on non-precious metal catalyst for the detection of methane and propane operated at 350 degrees C. The combination of a microelectromechanical system (MEMS)-based sensor with a low-power radio system provides the opportunity to monitor complex infrastructure without using a power grid as power supply. The sensor system has been characterised extensively under the exposure to methane and propane at concentrations between 2000 and 8000 ppm, as these gases are the common test gases for pellistors in industry. Methane is the main component of natural gas; propane is an important component of liquified petroleum gas (LPG). In addition, the influence of changes in humidity on the sensor response to methane was examined in more detail. Due to the planned operation of the sensor and radio system in different application scenarios, short (3 s) and long (60 s) sampling rates were used for investigations.

Automated summary

A novel wireless low-power catalytic gas sensor system based on non-precious metal catalyst for detecting methane and propane at 350 degrees C is presented, offering the opportunity to monitor complex infrastructure without using a power grid. By combining a microelectromechanical system (MEMS)-based sensor with a low-power radio system, the sensor system can be operated at lower temperatures compared to commercial pellistors, providing extensive characterization under exposure to methane and propane at concentrations common in industry.