FE901 In-line Ultrasonic Flow Meter
Summary:
The FE901 pipe-section ultrasonic flow meter for small-diameter pipes is an integrated ultrasonic flow meter specifically designed for applications with small pipe diameters. It is suitable for measuring the flow velocity and cumulative flow of single-media fluids such as water, solutions, and chemical reagents (with impurity content ≤4%). The product supports a wide range of pipe sizes from DN15 to DN32, delivers measurement accuracy of ±1.0% and repeatability of 0.4%, and covers a flow-velocity range of 0.1 to 10.0 m/s. Standard features include an RS485 communication interface (Modbus RTU protocol), a 4–20 mA analog output, and an OCT alarm output, facilitating seamless system integration. The device boasts an IP66 protection rating, LCD display with four-way rotation, data storage for up to 10 years, and multi-language user interfaces, making it ideal for real-time monitoring and control in industrial water treatment, chemical-reagent delivery, and general industrial fluid applications.
Keywords:
Category:
The FE901 pipe-section ultrasonic flow meter for small-diameter pipes is an integrated ultrasonic flow meter specifically designed for applications with small pipe diameters. It is suitable for measuring the flow velocity and cumulative flow of single-media fluids such as water, solutions, and chemical reagents (with impurity content ≤4%). The product supports a wide range of pipe sizes from DN15 to DN32, delivers measurement accuracy of ±1.0% and repeatability of 0.4%, and covers a flow-velocity range of 0.1 to 10.0 m/s. Standard features include an RS485 communication interface (Modbus RTU protocol), a 4–20 mA analog output, and an OCT alarm output, facilitating seamless system integration. The device boasts an IP66 protection rating, LCD display with four-way rotation, data storage for up to 10 years, and multi-language user interfaces, making it ideal for real-time monitoring and control in industrial water treatment, chemical-reagent delivery, and general industrial fluid applications.
Detailed introduction
Product Features
- Built-in advanced measurement chip with a time resolution of 20 ps for rapid response.
- Protection rating IP66.
- Integrated injection-molded structure with dual O-ring connections for convenient, reliable, and easy installation.
Measurement conditions
Single medium: The measured medium should be free of particles and air bubbles. Small-diameter tubes are more susceptible to the effects of impurities and air bubbles, whereas larger-diameter tubes exhibit better tolerance.
Sound-guiding duct: The duct exhibits excellent sound-guiding performance and does not contain internal materials such as steel wire or glass fiber that could impede sound wave transmission.
Flow stability: When the medium is in an unstable, turbulent flow condition, it can easily generate bubbles and interfere with signal propagation, causing the instrument to continuously update and search for the signal and resulting in significant fluctuations in the displayed value.
Required pressure: Many process fluids will generate bubbles when flowing due to insufficient pressure; this can also occur at high flow rates. Even when the fluid is water, a backpressure of 0.3 MPa must be maintained.
Other situations: Refer to the appendix of the instruction manual for guidance on selecting the installation location.
Installation Steps
01 Pipeline Cutting
Cut a section of pipe at the installation location.
02 Nut fitted onto the pipe
Unscrew two nuts from the instrument and thread them onto the pipe.
03 Adhesive Connector
Apply PVC adhesive to the two pipe ends on the instrument and insert them into the pipes.
04 Installation of Flow Meter
Place the instrument in the center position and tighten the nut to complete the installation; be sure to observe the flow direction during installation.
05 Power-On Operation
Connect the other end of the cable to a 24 VDC power supply, then apply power and observe. When the SQ value stabilizes above 50, it indicates that the measurement has stabilized.
Technical Specifications
| Product Name | FE901 In-line Ultrasonic Flow Meter |
| Accuracy | ±1.0% (±0.3 m/s ~ 5.0 m/s) |
| Flow rate range | 0.1 m/s ~ 10.0 m/s |
| Repeatability | 0.4% |
| Response time | 500ms |
| Analog Output | 4–20 mA, maximum load 600 Ω |
| Alarm Output | OCT upper and lower limit alarm output, pulse output, etc. |
| Communication interface | RS485, supports the Modbus RTU communication protocol |
| Power supply | 24 VDC @ 3 W |
| Cable length | Standard length: 2.0 meters, extendable up to 20 meters. |
| Button | Four touch buttons |
| Display screen | 1.54-inch 240×240 IPS LCD display (four-way rotation for easy reading) |
| Unit of measurement | Supports selection of metric and imperial units: m³/h, LPM, ml/min, GPM, LPH; the factory default unit is LPM. |
| Accumulator | 7-digit display |
| Data Storage | Cumulative data for days, months, and years can be stored for 10 years without loss. |
| Suitable medium | Water, solutions, chemical reagents (impurities ≤ 4%), etc. |
| Ambient temperature | -10°C~50°C |
| Medium temperature | 0°C~60°C |
| Installation Method | Integrated pipe section, connected by PVC-U union (flexible coupling). |
| Pipe diameter specifications | OD20 (DN15~½"), OD25 (DN20~¾"), OD32 (DN25~1"), OD40 (DN32~1½") |
| Environmental humidity | 0–95% relative humidity, non-condensing |
| Appropriate viscosity for testing | <300 cSt (mm²/s) |
| Protection Level | IP66 |
Select Parameters
| Specifications | -20 | -25 | -32 | -40 | |
| Outer pipe diameter | mm | 20 | 25 | 32 | 40 |
| Nominal Pipe Diameter (Metric) | DN | DN15 | DN20 | DN25 | DN32 |
| Nominal Pipe Diameter (Imperial) | NPS | 4 points | 6 points | 1 inch | 1.2 inches |
| Flow range | L/min | 0.92-70 | 1.36-150 | 2.71-200 | 4.24-330 |
| Flow range | cubic meters per hour | 0.055-4.2 | 0.082-9 | 0.163-12 | 0.254-19.8 |
Industry Applications
| Semiconductor | Fine Chemicals | Beverage industry | Scientific research experiment |
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