The results of this work in terms of power consumption of the sensing circuit improve the state-of-the-art on hazardous gas detection using WSN paradigm. The Wobscholl [14], Flyport [15],and Wasp mote [16] platforms are based on catalytic and/or semiconductor sensors and consume 1000, 800, and 750 mW, respectively. The Wobscholl node is an “R&D” prototype ensuring automatic calibration. In contrast, Flyport and Wasp mote are commercial platforms. They require frequent calibration and may resultin inaccurate gas measurement due to only one sensor embedded in the sensing circuit that ignores environmental effects. The wire-less sensor node proposed in Ref. [17] is based on two sensors in Wheatstone circuit. This work significantly reduces the power consumption of gas sensor nodes (up to 264 mW). The result is achieved due to careful power-aware platform design and pulse heating profile for the sensors. The pulse heating profile is realized by frequent turning on/off of heating pulses. The application of this approach may result in inaccurate measurements since the moisture does not fully evaporate from the sensor surface and lead to sensor damage because of frequent heating pulses variation. In this work, we apply constant heating profile to ensure full moisture evaporation and avoid the sensor damage. To the best of our knowledge, the lowest power consumption solution for sensor nodes based on catalytic sensors is proposed in Ref. [18] and is124.3 mW. To achieve this result, the authors “substituted” a reference sensor in Wheatstone circuit by complex four stage heating profile. The sensor response is measured between heating pulses of different amplitude in contrast to measuring sensor response from active and reference sensors as it is done in Wheatstone circuit. This approach helps to significantly reduce the power consumption, but has a number of drawbacks: (i) extra hardware is required to filter and amplify measured signal, (ii) four stage heating profile must be carefully adjusted.