A sensor management system using a LPWAN for managing the progress of administering a plurality of Ringer''s fluids to a patient, comprising: a sensor unit that is disposed in a building and connected to the liquid to sense a fluid- And outputting the signal as a signal； A manager side terminal which is disposed in a building and receives the ISM band signal of the liquid monitoring terminal and manages the initial condition setting and the liquid administration state for managing the liquid administration based on the received signal； And an ISM signal transceiver connected to the manager side terminal by wired / wireless connection to relay the ISM band signal from the liquid monitoring terminal to the manager side terminal and deliver the command signal from the manager side terminal to the liquid reception monitoring terminal, And the manager side terminal transmits and receives the ISM band signal through bidirectional communication through the LPWAN network to each other. The liquid monitoring terminal includes a rechargeable or battery powered battery, and includes a plurality of operation modes having a top and bottom sequence, The operation mode is relatively smaller in the data transmission amount and the transmission period of the ISM band signal than in the upper order operation mode, and the operation amount of the hardware components of the liquid reception terminal itself is also relatively small. Accordingly, it is possible to provide a low-cost fluid management system capable of efficiently managing a wide range of Ringer''s fluid with a simple structure.복수의 링거 수액을 환자에 투여하는 진행과정을 관리하기 위해 LPWAN을 이용하는 수액관리 시스템으로서, 건물 내에 분산배치되고 수액과 연결되어 수액투여상태를 감지하는 센서부와 센서부로부터의 감지신호를 ISM 대역 신호로 출력하는 무선부를 포함하는 수액감시 단말기와； 건물에 분산배치되고 수액감시 단말기의 ISM 대역 신호를 수신하여 수신된 신호를 기초로 수액 투여를 관리하기 위한 초기조건설정 및 수액투여상태를 관리하는 관리자측 단말기와； 관리자측 단말기측에 유무선으로 연결되어 수액감시 단말기로부터의 ISM 대역 신호를 수신하여 관리자측 단말기에 중계하고 관리자측 단말기로부터의 명령 신호를 수액감시 단말기로 전달하는 ISM 신호 송수신기를 구비하고, 수액감시 단말기와 관리자측 단말기는 상호간 LPWAN 망을 통해
