Factory-direct clamp-on ultrasonic flow meters for OEM equipment builders, system integrators, and facility engineers worldwide. No pipe cutting, no process shutdown — transit-time technology, DN15–DN6000, ±1% accuracy, 4-20mA / RS485. CE certified, IP67/IP68. CDU liquid cooling, HVAC, water treatment, and process flow measurement.
What is a clamp-on ultrasonic flow meter? A clamp-on (non-invasive) ultrasonic flow meter measures liquid flow by clamping transducers onto the outside of an existing pipe — no cutting, no welding, no process shutdown. Two transducers send ultrasonic pulses upstream and downstream; the time difference is precisely proportional to flow velocity. Zero contact with the liquid means zero contamination risk and no pressure drop. SEGMENsensor manufactures clamp-on ultrasonic flow meters in Shenzhen, China, covering DN15–DN6000, with 4-20mA, RS485/Modbus, and pulse outputs.
Three series covering portable handheld meters, wall-mount fixed installations, and compact single-pipe configurations — all transit-time, all clamp-on, all CE certified.
Integrated clamp-on flow meter with wall-mount host unit and remote transducers. OLED display for local reading, 4-20mA output for PLC/SCADA, RS485 Modbus RTU for BMS/DCIM. Ideal for permanent installation on HVAC chilled water, domestic water, cooling water return and supply lines.
Split-type clamp-on meter with separated display unit and transducers. Available in standard, high-temperature (+160°C), and anti-corrosion (316L housing) configurations. X3M series adds Modbus energy metering. Suitable for hot water, thermal energy measurement, oil cooling loops, and high-ambient-temperature industrial environments.
Battery-powered handheld clamp-on flow meter for commissioning, survey, leak investigation, and spot-check measurements. Built-in data logger with SD card storage. Connects to a PC for report generation. No need for a permanent installation — ideal for building services engineers, commissioning specialists, and maintenance teams.
All parameters meet or exceed comparable products. Transit-time clamp-on flow meter manufacturer China — customizable output, pipe material, and enclosure rating for OEM applications.
| Parameter | U Series (Integrated) | X3 / X3M Split-Type | U20 Portable |
|---|---|---|---|
| Measurement Principle | Transit-time (dual-path) | Transit-time (dual-path) | Transit-time (dual-path) |
| Pipe Size Range | DN15–DN6000 | DN25–DN6000 (X3M: DN32–DN6000) | DN15–DN6000 |
| Accuracy | ±1% (U10) · ±2% (U12) · <3% FS (U13) | ±1% of reading | ±1% of reading |
| Repeatability | ±0.2% | ±0.2% | ±0.2% |
| Velocity Range | ±0.01–±15 m/s | ±0.01–±15 m/s | ±0.01–±15 m/s |
| Liquid Temperature | -40°C to +90°C | -40°C to +160°C (high-temp) | -40°C to +90°C |
| Pipe Materials | Steel, SS, Cu, CI, PVC, PE, most plastics | Steel, SS, Cu, CI, PVC, PE, most plastics | Steel, SS, Cu, CI, PVC, PE, most plastics |
| Liquids Measured | Water, glycol, oil, chemicals (single-phase) | Water, glycol, oil, chemicals (single-phase) | Water, glycol, oil, chemicals (single-phase) |
| Output Signals | 4-20mA, RS485 Modbus RTU, pulse, relay | 4-20mA, RS485 Modbus RTU, pulse, M-BUS (X3M) | 4-20mA, RS232, USB data logger, SD card |
| Display | OLED color display, flow rate + totalizer | LCD (X3) / OLED (X3M), backlit | Large LCD, backlit, multi-language |
| Power Supply | 85–265 VAC or 10–36 VDC | 85–265 VAC or 10–36 VDC | Rechargeable Li-ion battery, 3,000 mAh |
| Protection Rating | IP67 | IP67 / IP68 (transducers) | IP54 |
| Certifications | CE RoHS ISO9001 | CE RoHS ISO9001 | CE RoHS |
| OEM MOQ | 10 units | 10 units | 10 units |
| Lead Time | 3–5 weeks | 3–5 weeks | 3–5 weeks |
Liquid-cooled data centers (CDU, rear-door heat exchangers, direct-to-chip cooling) demand non-invasive flow monitoring that won't contaminate the cooling loop or require system downtime to install.
SEGMENsensor specializes in clamp-on (external) technology. Here is an honest comparison to help OEM engineers select the right type for their application.
| Criterion | Clamp-On (SEGMENsensor) | Insertion Ultrasonic | Electromagnetic (Mag) | Differential Pressure |
|---|---|---|---|---|
| Pipe Modification | ✓ None — external clamp | Drill + hot-tap required | Full pipe cut, flanges | Full pipe cut, flanges |
| Liquid Contact | ✓ Zero — non-invasive | Wetted probe | Wetted electrodes | Wetted orifice plate |
| Pressure Drop | ✓ Zero | Minimal | Low | High (orifice) |
| Installation Time | ✓ < 2 hours | 4–8 hours | 1–2 days (shutdown) | 1–2 days (shutdown) |
| Best Pipe Size | DN15–DN6000 (all sizes) | DN100–DN2000 | DN10–DN3000 | DN25–DN1000 |
| CDU / Coolant | ✓ Ideal — no contamination | Risk of leakage | Only for conductive fluids | Not recommended |
| Accuracy | ±1% (site-calibrated) | ±1–±2% | ✓ ±0.3–±0.5% | ±0.5–±2% |
| OEM Cost | ✓ Low (factory direct) | Low–Medium | High | Medium |
In-house transducer bonding, PCB assembly, and calibration — batch traceability on every order.
EMC directive compliance. CE declaration of conformity for EU customs clearance.
Samples 1–5 units, no minimum. Custom OEM branding available from 50 units.
20+ years manufacturing ultrasonic flow meters. Direct factory in Shenzhen — not a trading company.
Non-invasive flow measurement wherever pipe cutting is impractical, contamination is unacceptable, or retrofitting an existing system. Custom LVDT OEM factory — specify your pipe and fluid below.
SEGMENsensor manufactures clamp-on ultrasonic flow meters as a direct factory in Shenzhen — not a distributor, not a trading company. In-house transducer bonding, PCB assembly, firmware development, and ISO 9001 calibration ensure consistent quality across every OEM batch.
Common questions from OEM engineers and system integrators. Email info@segmensensor.com for application-specific advice — we reply within 24 hours.
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Tell us your pipe size, liquid type, temperature, output requirement, and quantity. Our engineering team replies within 24 hours.
SEGMEN Industrial Development Co., Ltd. · Shenzhen, China · info@segmensensor.com · +86 138 2870 4591