Executive standard: ISO4064-2014 GBT778-2018 Measured fluid: Water, sewage, seawater. Measuring other liquids requires customization. Ensure that water fills the pipe. Fluid temperature: 0.1-30 degrees Celsius Working environment: Temperature -30 to 45 degrees Celsius, Humidity 100% (RH) Working pressure: 1.6MPa Pressure loss: No pressure loss Sensitivity level of upstream flow field: U5 Sensitivity level of downstream flow field: D3 Climate and mechanical safety level: Level C Electromagnetic compatibility level: Level E2 Communication interface: RS485, USART, Infrared interface. Optional M-BUS or NB-IOT wireless transmission. Output signal: Optional OCT Power supply: Built-in lithium battery or external DC 8-24V power supply Protection level: IP68 Local display: Two lines show 9-bit cumulative flow, 6-bit instantaneous flow, various status prompts and units Data storage: Lithium battery power is required for storing parameters. It can automatically record the cumulative flow of 31 months and the daily flow of the 32nd month. Flow measurement period: Application status: once per second; Verification status: 4 times per second Power consumption: Standard status.