Accurate metrological technology applied to mine gas drainage monitoring and measuring

According to an accurate metrological difiut problem of ifferent measuring point existed in the mine gas drainage monioring and measuring system.the paper analyzed inflence factors ofgas rainage pipe network monitorng.the paper stated the technical advantages of the borehole manifod measuring instrument apied to the borehole montoring and measuring of the gas drainage d ling site based on the flow detection of th utrasound related method, and analjzed the technical advantages of the pipeline gas monitoring and measuring equpment appied to the monitoring and measuing of the gas drainage poeie netwrk based on the latral difuse refe ction gas concentration detecion and based on the circulated sel-excied fiow detection.With the comparison measurement ofthe steperormances,thegas concentration and fiow error between the two equipments and caliration equipments was al lasthan 5% and could further approve thefeastilty apelie to the accurate metrology of the gas drainage monitoring and measuring.