Introduction
The document is a user manual for the YFMW3800 Wireless Electromagnetic Flow Meter by Xi'an Yunyi Instrument Company Limited. It provides detailed specifications, installation instructions, and ordering information for the flow meter.

Main Specifications
The YFMW3800 is designed to measure conductive liquids with electrical conductivity greater than 5 µS/cm. It is suitable for large pipes with diameters ranging from DN300 to DN3000mm. The device features a simple structure with no moving parts, ensuring a long service life and reliable measurement. It operates under a pressure of less than 1.6 Mpa and a medium temperature range of 0°C to 70°C. The flow range is from 0.01 m/s to 10 m/s, with a power consumption of less than 20 W. The protection grade is IP68, and it supports various communication protocols including Modbus and Hart.

Installation Instructions
The installation should ensure the position is full of liquid, with minimal ovality in the pipeline. The upstream straight pipe length should be more than 10 times the diameter (10D), and the downstream should be more than 5D. Vertical installation is recommended, with the sensor aligned vertically with the axis and an angle of less than 5° with the cross-section. The sensor can be inserted at 1/4 or 1/2 of the pipe's inner diameter.

Ordering Information
The flow meter can be customized based on diameter, structure, electrode material, power supply, output signal, communication protocol, and installation type. Options include different electrode materials like 316L, Titanium, and Hastelloy C, and power supplies ranging from 110~240V AC to lithium battery options.

Data Summary
A table provides a comparison of common pipe inner diameters with average flow rates and volume flow rates, illustrating the device's capability to handle various flow conditions.

Conclusion
The YFMW3800 is a versatile and reliable flow meter suitable for a wide range of industrial applications, offering ease of installation and maintenance with its robust design and comprehensive specifications.