Portable Clamp-On Ultrasonic Flow Meter — Battery Powered, DN15–DN6000, OEM China
SEGMENsensor portable clamp-on ultrasonic flow meters measure liquid flow velocity without pipe cutting or process shutdown. Clamp the transducers onto the outside of the pipe — transit-time measurement gives ±1% accuracy on water, coolants, and clean liquids. DN15 to DN6000 pipe range. Built-in data logger with 2000 data points, 4-20mA output, and RS485/Modbus. Battery powered (12+ hours). CE and RoHS certified. OEM from Shenzhen since 2019, MOQ 10 pcs.
What is a Portable Clamp-On Ultrasonic Flow Meter?
A portable clamp-on ultrasonic flow meter is a handheld, battery-powered instrument that measures liquid flow by clamping ultrasonic transducers onto the outside of a pipe. No pipe cutting, no process shutdown, and no contamination risk. It uses the transit-time method: two ultrasonic pulses travel diagonally through the pipe, one with the flow and one against. The time difference between the two pulses is proportional to the average flow velocity. Multiplied by the pipe cross-sectional area, this gives volumetric flow rate. Ideal for commissioning verification, energy audits, spot-checks, and rental applications.
Specifications
Portable Clamp-On Ultrasonic Flow Meter — Full Specification Table
Transit-time measurement principle. All specifications for standard model with DN15–DN6000 transducer set. High-temperature transducer variant available on request.
-30°C to +80°C (standard) / -30°C to +160°C (high-temp)
Operating Temperature
0°C to +50°C (electronics)
Protection
IP65 (meter) / IP68 (transducers)
Weight
~1.2 kg (meter + transducers + case)
Certifications
CE, UKCA, RoHS
MOQ
10 pcs
Lead Time
3–4 weeks (standard) / 4–6 weeks (custom OEM)
Installation
How to Install a Portable Clamp-On Flow Meter — 3 Steps
No pipe cutting, no special tools, no process shutdown. From unboxing to live flow reading in under 10 minutes.
01
Input Pipe Parameters
Enter pipe outer diameter, wall thickness, pipe material, and liquid type into the meter. The meter automatically calculates the correct transducer spacing for Z/V/W mounting configuration.
02
Mount the Transducers
Clean the pipe outer surface, apply acoustic coupling gel, and secure the transducers at the meter-calculated spacing. Adjust position to maximize signal strength — target signal quality score above 80.
03
Start Measurement
The meter displays real-time flow velocity, volumetric flow rate, and accumulated total. Connect 4-20mA output to a recorder or read Modbus RTU data via RS485. Log data to internal memory for later export.
Applications
Portable Clamp-On Flow Meter — 8 Industry Applications
From HVAC energy audits to oil field water injection verification — battery-powered portable measurement without pipe modification.
🏢
Building Energy Audits
Measure chilled water and hot water flow in HVAC systems for energy efficiency baseline. No system shutdown required for building management commissioning.
💧
Water Network Leak Detection
Spot-check municipal water pipe flow balance to identify losses. Portable measurement at multiple nodes to locate unaccounted-for water in distribution networks.
🔧
Industrial Commissioning
Verify pump flow rates and balance cooling circuits during plant startup. Confirm that installed fixed flowmeters are reading accurately against an independent reference.
🖥️
Data Center Cooling (CDU)
Non-invasive measurement of coolant loop flow in CDU systems without process shutdown. Verify coolant distribution balance across server rack manifolds.
⚗️
Chemical Plant Maintenance
Flow verification without chemical exposure — transducers mount on pipe exterior only, eliminating wetted parts and contamination risk in aggressive chemical environments.
🌊
Wastewater Treatment
Measure effluent flow in large diameter pipes and open channels. Doppler mode add-on available for wastewater with suspended solids content above transit-time threshold.
🛢️
Oil & Gas Production
Portable oil field water injection flow verification and test separator measurement. Battery operation eliminates need for power supply at remote wellhead locations.
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Rental / Spot Testing
Temporary installation for flow testing, acceptance testing, or dispute measurement. Multi-point survey capability — one meter can cover dozens of measurement points in a single day.
Comparison
Portable vs Fixed Clamp-On Ultrasonic Flow Meters
Both use the same transit-time measurement principle and clamp-on transducers — the difference is power source, installation type, and intended use case.
Feature
Portable Meter
Fixed Installation Meter
Power Source
Battery (12+ hr) / USB
24V DC (loop powered)
Installation
Temporary, multi-point
Permanent, one location
Output
RS485 + 4-20mA + USB
4-20mA + RS485/Modbus
Data Logger
Built-in (2000 pts)
External PLC/DCS
Best Use
Audits, commissioning, rental
Continuous monitoring
MOQ (SEGMENsensor)
10 pcs
10 pcs
CE Certified
✓
✓
Need both portable and fixed clamp-on meters?
SEGMENsensor supplies both portable handheld meters and permanently installed fixed clamp-on flow meters in the same DN15–DN6000 range. Combined OEM orders qualify for volume pricing. See the full ultrasonic flow meter range.
Technical and sourcing questions from OEM buyers about portable clamp-on ultrasonic flow meters.
How accurate is a portable clamp-on ultrasonic flow meter?
Under ideal conditions (straight pipe run ≥10D upstream and 5D downstream, clean liquid, full pipe, Reynolds number >10,000), accuracy is ±1% of reading. In practice, accuracy of ±2–3% is more typical in field conditions with some pipe turbulence. Accuracy is most affected by: pipe scale or internal coating (reduces ultrasonic signal penetration), non-full pipe flow, highly turbulent flow near pumps or elbows, and entrained gas bubbles. SEGMENsensor's signal quality indicator helps identify installation quality — readings below 60% signal score should be viewed with caution.
What pipe materials can a clamp-on flow meter measure?
Transit-time clamp-on meters work on all pipe materials that transmit ultrasonic signals: carbon steel, stainless steel, copper, PVC, HDPE, ductile iron, fiberglass, and concrete-lined pipes. They cannot measure through pipes with severely corroded internal walls (significant signal scatter), cast iron with graphite flaking, or pipes with heavy external insulation covering the transducer location. For pipes with cement lining, bitumen lining, or rubber lining, use the appropriate transducer coupling method and confirm signal quality before recording measurements.
What liquid types can be measured with a portable clamp-on flow meter?
Transit-time clamp-on meters measure clean liquids or liquids with low solids content (<100 ppm suspended particles). Suitable liquids: water, drinking water, chilled water, cooling water, seawater, ethylene/propylene glycol solutions, diesel fuel, light mineral oil, hydraulic oil, and chemical solutions with no gas entrainment. Not suitable for: slurries (>2% solids), wastewater with high solids, aerated or heavily gaseous liquids, liquids with significant suspended particulates. For wastewater with solids, specify the Doppler mode variant.
What is the minimum and maximum pipe size for a portable clamp-on flow meter?
SEGMENsensor portable clamp-on meters cover DN15 (0.5" OD) to DN6000 (240" OD). For small pipes (DN15–DN50), use 1 MHz high-frequency transducers in Z-mount configuration (transducers on opposite sides of pipe). For medium pipes (DN50–DN300), use 500 kHz transducers in V-mount (both transducers same side). For large pipes (DN300–DN6000), use 200 kHz transducers in W-mount or multi-path configuration. The meter automatically calculates the correct transducer spacing after you input pipe outer diameter, wall thickness, and material.
How long does the battery last and can it run on external power?
The built-in lithium-ion battery provides 12+ hours of continuous operation, sufficient for a full working day of spot measurements. Battery charges fully in 3–4 hours via included AC adaptor (100–240V AC) or 12V DC car adaptor. For extended continuous monitoring installations (e.g., overnight energy audit), connect the included 5V USB power bank or 12V DC external supply — the meter runs indefinitely while charging the internal battery simultaneously. The 4-20mA output also functions during battery operation (sourcing type, requires external 24V loop supply connected to the output terminals).
Can the portable flow meter store and export data?
Yes. Built-in data logger stores up to 2,000 data records, each with timestamp (date/time), flow rate, flow velocity, accumulated total flow, and signal quality score. Logging interval: 1 second to 24 hours (user-configurable). Export: connect USB cable to PC and copy the CSV file from the meter's onboard storage — no software installation required, opens directly in Excel. Optional software (Windows) allows trend graphs, report generation, and multi-meter data merging. For continuous RS485 monitoring, use Modbus RTU protocol — register map supplied with purchase.
What is the data logger memory capacity and how do I export measurements to Excel?
Data logger capacity: 2,000 measurement records. At 1-minute logging interval, this covers ~33 hours; at 5-minute interval, ~7 days of continuous logging. Export procedure: (1) Connect USB cable (type-C) to PC. (2) Meter appears as USB mass storage device. (3) Copy the DATA.CSV file to PC. (4) Open in Excel — columns are: Timestamp / Flow Rate (m³/h) / Velocity (m/s) / Forward Total (m³) / Reverse Total (m³) / Signal Quality. No software or drivers needed on Windows 10/11 or macOS. Optional PC software available for trend graphs and PDF reports.
What is the OEM MOQ and lead time for portable clamp-on flow meters from China?
MOQ 10 pcs for standard portable clamp-on meters (transit-time, DN15–DN6000 transducer set, 4-20mA + RS485 output, built-in data logger). Samples 1–2 pcs accepted. Standard lead time: 3–4 weeks. Custom OEM configurations (private label, custom color, language, firmware branding, additional outputs, high-temperature transducers): add 2 weeks, MOQ 50 pcs. CE and RoHS certification documents included with every shipment. Factory: Segmen Industrial Development Co., Ltd., Registration No. 91440300MAEUXXQU04, Shenzhen, Guangdong, China.
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