As we all know, as a low-power wan and cellular Internet of things technology based on authorized frequency band, nb-iot is most suitable for indoor application of three tables, underground pipe network, traffic network and other important scenarios of smart city.In addition, relevant data show that the penetration rate of smart meters is relatively high, but due to the overall construction of smart grid, rural power grid transformation and upgrading, some smart meters into the inventory exchange stage and other factors stimulated, smart meter market still has great potential

Introduction of the research content, this speech focuses on the application of hall and magnetoresistance sensor in water and gas meter counting, mainly including hall and magnetoresistance respectively in water and gas counting and antimagnetic principle and logic, hall and magnetoresistance sensor principle, honeywell hall and magnetoresistance of the main parameter characteristics, replace the advantages and disadvantages of reed tube.

Expert introduction: Song Baoyuan joined honeywell, responsible for the promotion and application support of various sensor products;The main products involved include magnetic sensors, pressure sensors, speed and position sensors, current sensors, CO2 and PM2.5 sensors. It mainly supports the application of hall and reluctance in water and gas meters, and is familiar with the counting and antimagnetic principle of various water and gas meters.