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. Condition: New. Origin: China.