Fecha de publicación: 30/05/2024 Fuente: Wipo "IOT" Disclosed in the present invention is a constant flow detection method based on an NB-IoT diaphragm gas meter, solving the existing problem that it is difficult to accurately diagnose an abnormal gas use condition of a user. The key points of the technical solution are: dividing sub-intervals, and setting upper and lower thresholds and constant flow parameters of the sub-intervals; performing flow calculation and monitoring on the basis of pulse metering, clearing the number of flow calculations, and calculating a current flow of a specific sub-interval; and determining whether the current flow is located between upper and lower thresholds of the sub-interval, when the set rated number of calculations is reached during continuous monitoring, calculating an average time spent by each flow calculation, calculating a flow calculation frequency threshold, comparing the accumulated number of calculations within a flow monitoring duration with the flow calculation frequency threshold, and performing constant flow determination on the sub-interval. According to the constant flow detection method based on the NB-IoT diaphragm gas meter of the present invention, different flow intervals can be monitored, and diagnosis for gas use abnormality of a user is more accurate and more convenient, and costs are lower.