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Area monitoring is a common application of wireless sensor network (WSN). Mining area Monitoring System for Methane is very important because it guarantees the coal mine production safety. Automatic calibration technologies were useful for reduce the impacts of methane sensor's stability that led to shortcomings of traditional gas detector, such as frequent recalibration, high maintenance cost, and high false alarm rate. This paper described the hardware architecture of a mini intelligent methane sensor and the algorithmic research for maintenance-free techniques and technologies in WSN. The intelligent methane sensor is used as a sensing node to form a real-time methane monitoring network. The network connectivity can be used not only for methane data collection but also for the calibration and diagnosis of the sensors through data processing of the nearby sensing node, which provided the effective supporting for automatic calibration of the single intelligent methane detector. An intelligent methane sensor system equipped with the network connectivity can perform the calibration autonomously in the field, and there is no need to prepare standard gases for each system as in the conventional calibration.