The LONN-UFM clamp on ultrasonic flow meter delivers non-intrusive, high-accuracy liquid flow measurement without cutting pipes. Featuring time measurement chip with ≤10ps precision, OLED display with 360° rotation, and magnetic bracket design for easy installation. Supports DN6-DN100 pipes, 4-20mA/RS485 outputs, IP54/IP65 protection. Ideal for chemicals, food, pharmaceuticals, and water treatment.
The LONN-UFM clamp on ultrasonic flow meter represents the next generation of non-intrusive flow measurement technology. Unlike traditional in-line flow meters that require cutting pipes and interrupting processes, the LONN-UFM series clamps directly onto the outside of existing pipes—enabling installation without process downtime, welding, or pipe modifications.
At the heart of the LONN-UFM lies a high-precision time measurement chip capable of detecting time differences as small as 10 picoseconds (10ps). This extraordinary temporal resolution enables accurate flow velocity calculation even at low flow rates, making the clamp on ultrasonic flow meter suitable for both precision dosing applications and high-flow process monitoring.
Traditional flow meters require cutting into pipes, welding flanges, and disrupting production—costing time, money, and operational continuity. The LONN-UFM clamp on ultrasonic flow meter eliminates these pain points:
The LONN-UFM clamp on ultrasonic flow meter integrates an advanced time-to-digital converter (TDC) chip specifically designed for ultrasonic flow measurement. This chip measures the transit time of ultrasonic pulses traveling upstream and downstream along the pipe, calculating flow velocity from the time difference.
Key advantages of the TDC chip:
| Parameter | Specification |
|---|---|
| Accuracy | ±2.0% of reading (at 0.3-5.0 m/s) |
| Linearity | ±2.0% |
| Repeatability | 0.8% |
| Flow Velocity Range | 0.1 m/s – 5.0 m/s |
| Response Time | 500 ms |
| Calibration | Factory calibrated on standard water pipe |
| Pipe Outer Diameter (OD) | DN | NPS | Flow Range (L/min) | Flow Range (m³/h) |
|---|---|---|---|---|
| 9.53 mm | DN6 | ¼” | 0.2 – 20 | 0.01 – 1 |
| 12.7 mm | DN8 | ⅜” | 0.44 – 30 | 0.03 – 2 |
| 15 mm | DN10 | ½” | 0.57 – 50 | 0.03 – 3 |
| 20 mm | DN15 | ½” | 0.92 – 70 | 0.06 – 4 |
| 25 mm | DN20 | ¾” | 1.36 – 150 | 0.08 – 10 |
| 32 mm | DN25 | 1″ | 2.71 – 200 | 0.16 – 15 |
| 40 mm | DN32 | 1¼” | 4.24 – 330 | 0.25 – 20 |
| 50 mm | DN40 | 1½” | 6.8 – 460 | 0.41 – 30 |
| 63 mm | DN50 | 2″ | 9.54 – 700 | 0.57 – 40 |
| 75 mm | DN65 | 2½” | 14.8 – 1030 | 0.89 – 60 |
| 90 mm | DN80 | 3″ | 21.8 – 1360 | 1.31 – 80 |
| 110 mm | DN100 | 4″ | 36.5 – 2170 | 2.19 – 130 |
Note:
The LONN-UFM clamp on ultrasonic flow meter works on virtually all common pipe materials:
Metal Pipes:
Plastic Pipes:
Suitable Media:
Media Requirements:
| Parameter | Specification |
|---|---|
| Power Supply | 24VDC ±10% @ 3W |
| Analog Output | 4-20mA, max load 600Ω |
| Communication | RS485, Modbus RTU protocol |
| Alarm Output | OCT (Open Collector Transistor), up/down limit alarm (optional) |
| Relay Output | 30VDC @ 1A, switching freq < 2Hz (optional) |
| Feature | Specification |
|---|---|
| Display Type | 1.54″ 240×240 IPS LCD |
| Display Rotation | 360° (easy reading from any angle) |
| Display Content | Flow rate, velocity, net totalizer, single totalizer, daily max/min, date/time |
| Display Units | m³/h, LPM, GPM, LPH (metric/imperial switchable) |
| Languages | English, Chinese Simplified, Chinese Traditional |
| Keypad | 4 touch keys (menu navigation, value setting) |
| Data Storage | 10 years (64 months, 64 days) |
| Calendar Battery | CR1220 |
| Parameter | Specification |
|---|---|
| Housing Material | Aluminum alloy |
| Installation Method | Clamp-on (upper + lower bracket, 4 screws) |
| Cable Length | Standard 2m (extendable to 20m) |
| Cable Type | Shielded twisted pair |
| Protection Class | IP54 (standard), IP65 (optional) |
| Environment Temp | -10°C to 50°C |
| Environment Humidity | 0-95% RH (non-condensing) |
| Weight | 0.68 – 1.37 kg (model dependent) |
| Model | Pipe OD (mm) | A max (mm) | B (mm) | C (mm) |
|---|---|---|---|---|
| -9.53 | 9.53-12.7 | 97 | 58 | 106 |
| -12.7 | 12.7-14 | 97 | 58 | 106 |
| -15 | 14-17 | 97 | 58 | 106 |
| -20 | 17-20 | 103 | 58 | 106 |
| -25 | 22-30 | 103 | 58 | 106 |
| -32 | 30-35 | 108 | 58 | 106 |
| -40 | 38-45 | 118 | 68 | 106 |
| -50 | 48-54 | 127 | 78 | 106 |
| -63 | 58-68 | 143 | 91 | 130 |
| -75 | 68-78 | 156 | 105 | 136 |
| -90 | 88-96 | 171 | 119 | 150 |
| -110 | 108-116 | 194 | 143 | 174 |
The LONN-UFM clamp on ultrasonic flow meter clamps onto the outside of pipes without cutting, welding, or process interruption. Installation takes less than 15 minutes:
Installation Steps:
Magnetic Design Advantage: Strong magnets embedded in the bracket prevent screws from falling during installation—especially useful in vertical pipe applications or confined spaces.
The core advantage of the LONN-UFM external mounted ultrasonic flow meter is its time measurement chip with 10ps resolution. This enables:
The 1.54″ IPS LCD display can be rotated 360°, ensuring easy reading regardless of installation orientation. Display content includes:
The LONN-UFM clamp on flow meter supports three languages:
Menu navigation uses a picklist method—simply scroll through options and select. No complex programming or parameter codes to memorize.
The clamp on ultrasonic flow meter stores measurement data for:
Data is retained even during power loss (CR1220 battery backup).
Standard Outputs:
Optional Outputs:
Unlike electromagnetic flow meters that require conductive fluids, the LONN-UFM ultrasonic flow meter for pipe works on virtually any liquid:
Pipe materials can be metal (steel, copper) or plastic (PVC, PPR, HDPE)—the ultrasonic signal penetrates both.
The LONN-UFM external mount flow meter is designed for industrial environments:
Suitable for indoor and outdoor installation (avoid direct sunlight and rain exposure for extended lifespan).
The LONN-UFM clamp on ultrasonic flow meter is widely used in industries where non-intrusive measurement is essential:
Why clamp-on? Chemicals may be corrosive or hazardous—external mounting eliminates leak paths and reduces material compatibility concerns.
Why clamp-on? No crevices or dead legs where bacteria can grow—meets hygienic design principles.
Why clamp-on? No intrusion into the process stream—maintains sterility and prevents cross-contamination.
Why clamp-on? No metal ions leach into ultrapure water—maintains water quality.
Why clamp-on? Easy to install on existing pipes without cutting—reduces installation cost and time.
Why clamp-on? No obstruction to flow—prevents clogging from particulates in cleaning solutions.
Proper installation site selection is critical for accurate measurement with the LONN-UFM clamp on ultrasonic flow meter. Follow these guidelines:
Ensure the pipe is always full of liquid. Recommended locations:
Avoid:
Ultrasonic flow meters require fully developed flow profile. Maintain straight pipe lengths:
| Upstream Obstacle | Minimum Upstream Length | Minimum Downstream Length |
|---|---|---|
| Elbow | 10D | 5D |
| Tee | 10D | 5D |
| Expanded pipe | 10D | 5D |
| Reducing pipe | 30D | 10D |
| Valve | 50D | 5D |
| Pump | 50D |
Note: D = Pipe outer diameter
Ensure pipe surface temperature at measurement point is within transducer limits:
Use sandpaper or wire brush to remove paint, rust, dirt from the pipe surface at the installation location. A clean surface ensures good ultrasonic coupling.
When ordering the LONN-UFM clamp on ultrasonic flow meter, please provide the following information:
| Parameter | Options / Specification |
|---|---|
| Model (Pipe OD) | -9.53, -12.7, -15, -20, -25, -32, -40, -50, -63, -75, -90, -110 |
| Pipe Material | Stainless steel, carbon steel, copper, PVC, PPR, etc. |
| Pipe OD (mm) | Actual outer diameter of pipe |
| Wall Thickness (mm) | Actual wall thickness of pipe |
| Fluid Type | Water, chemical, oil, etc. |
| Fluid Temperature (°C) | Operating temperature range |
| Flow Range (m³/h) | Minimum and maximum flow rates |
| Output Signal | 4-20mA, RS485 (standard); alarm/relay (optional) |
| Power Supply | 24VDC (standard); 220VAC with converter (optional) |
| Cable Length (m) | Standard 2m; max 20m |
| IP Grade | IP54 (standard); IP65 (optional) |
Model: LONN-UFM-50
Pipe Material: Stainless steel 304
Pipe OD: 50 mm
Wall Thickness: 3 mm
Fluid: Water
Fluid Temperature: 20°C
Flow Range: 1-30 m³/h
Output: 4-20mA + RS485 Modbus-RTU
Power Supply: 24VDC
Cable Length: 5m
IP Grade: IP65
A clamp on ultrasonic flow meter is a non-intrusive device that measures flow by clamping onto the outside of a pipe. It works by transmitting ultrasonic pulses through the pipe wall into the flowing liquid. The time difference between pulses traveling upstream and downstream is proportional to flow velocity. The LONN-UFM uses a high-precision time measurement chip (10ps resolution) to calculate this time difference accurately.
Clamp-on flow meters like the LONN-UFM offer several advantages:
The LONN-UFM external mounted ultrasonic flow meter works on virtually all common pipe materials:
Pipe sizes range from DN6 (OD9.53mm) to DN100 (OD110mm). For larger pipes, contact us for custom solutions.
The LONN-UFM can measure most single-phase liquids:
Requirements:
The LONN-UFM has an accuracy of ±2.0% of reading at flow velocities between 0.3 m/s and 5.0 m/s. Below 0.3 m/s, accuracy may degrade slightly, but the meter can still measure flows as low as 0.1 m/s.
Accuracy is verified on a calibrated water test loop before leaving the factory. Field accuracy can be optimized by performing zero calibration during initial installation.
The LONN-UFM is designed for self-installation. The magnetic bracket design and touch-key menu system make installation and setup straightforward. No specialized training is required—simply follow the installation guide:
Total installation time: 15-30 minutes.
For complex applications (hazardous area, high temperature, large pipe), we recommend consulting our technical support team.
Ready to experience the benefits of non-intrusive flow measurement with the LONN-UFM clamp on ultrasonic flow meter? Contact us today for a customized quote.
When requesting a quote, please provide:
Contact Information:
Our technical team will respond within 24 hours with a detailed quotation and technical proposal tailored to your application.
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