FU-LT Clamp-On Ultrasonic Flow Meter For Small Pipe Diameters

Made in Taiwan, the FU-LT series clamp-on ultrasonic flowmeters are designed for small-diameter pipes below 1 inch. Using a non-contact measurement principle, they require no pipe cutting, no coupling gel, no pressure loss, and do not contaminate the fluid, making them suitable for various chemical fluids and harsh environments.

Applicable Pipe Size:	1/4" ~ 1" (DN8 ~ DN25)
Fluid Temperature:	0 ~ 85°C (No ice on pipe surface)
Applicable Fluids:	Various liquids (no impurities or bubbles)
Measurement Accuracy:	±3.0% of reading (10% ~ 100% F.S.) ±0.3% F.S. (0% ~ 10% F.S.)
Protection Rating:	IP66
Power Supply:	DC 24V
Display Module:	Three-color backlight + 3-line, 16-character LCD
Input / Output:	Analog output (self-powered 10-bit 4–20mA)
	Modbus RTU RS485
	NPN output

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Ultrasonic Clamp-On Flow Meter

The ultrasonic clamp-on flow meter performs non-contact measurement through sensors mounted on both sides of the pipeline. The installation process requires no pipe cutting or interruption of fluid flow. Its non-intrusive design prevents liquid contamination. It is particularly suitable for applications where fluids are costly and pipe diameters are small, commonly seen in the semiconductor, electronics, and chemical industries — for example, ultrapure water in semiconductor processes, corrosive chemicals in PCB manufacturing, and trace wastewater monitoring in water treatment systems.

ToF (Time of Flight) Ultrasonic Flow Meter Principle

FU-ES ultrasonic flow meters use EchoSense technology based on the Time of Flight principle, calculating flow velocity by measuring the difference in ultrasonic travel time upstream and downstream. Flow velocity is then combined with the known pipe cross-section to determine flow rate. Learn more: Flow Rate Formula

Compatible with Multiple Fluids, Pipe Materials, and Sizes

EchoSense ultrasonic flow meters work with a wide range of fluids, from water and oil to various chemicals. They are compatible with diverse pipe materials, including stainless steel, PVC, PP, and PVDF, and support pipe sizes from 1/4" to 1", offering broad application flexibility.

Ultra-Compact Design for Precision Applications

The FU-LT series is engineered for ultra-compactness, ranking among the smallest in the industry. Designed for limited installation spaces and small pipe diameters, it delivers stable, high-efficiency, and accurate flow measurement without occupying extra space. Whether inside precision machinery, narrow industrial equipment, or confined system layouts, FU-LT fits seamlessly. Unlike conventional flow meters that are bulky or unsuitable for micro pipe sizes, FU-LT precisely detects small flow variations, meeting the demanding requirements of semiconductor, electronic chemical, and precision manufacturing industries.

Durable, Corrosion-Resistant Material for Harsh Environments

FU-LT features a stainless steel body with a Teflon® coating, offering corrosion resistance, anti-stick, insulation, and low-friction properties. This coating effectively withstands salt spray, oil vapors, and industrial cleaning agents without peeling or degrading. Free from heavy metals and with low VOC emissions, it is environmentally friendly and ideal for chemical, outdoor, and food manufacturing environments that demand high corrosion resistance and cleanliness.

Save Time & Cost: No More Coupling Gel

Traditional ultrasonic flow meters rely on coupling gel to transmit signals, requiring tedious application, regular replenishment, and prone to dirt, drying, and displacement, affecting accuracy. FU-LT uses LORRIC’s exclusive durable rubber pads to fully replace gel—fast, clean, and contamination-free installation ensures long-term stable signal transmission while reducing maintenance time and consumable costs.

One-Touch Setup: Auto Pipe Material & Size Detection

FU-LT features a built-in database of common pipe sizes and materials. After installation, it automatically detects pipe material, diameter, and wall thickness—no need to manually enter complex parameters. This simplifies setup, helps users complete installation quickly, and greatly reduces configuration errors and operation time.

Spec

		FU-LT008	FU-LT010	FU-LT015	FU-LT020	FU-LT025
Installation Method		Clamp-on (Pipe-Mounted)
Nominal Diameter (DN / inch)		DN8 (1/4")	DN10 (3/8")	DN15 (1/2")	DN20 (3/4")	DN25 (1")
Applicable Outer Pipe Diameter
	mm	12 - 13.8	15.8 - 18	19 - 22.5	25 - 28.6	31.8 - 35
	inch	0.47-0.54	0.61-0.7	0.74-0.88	0.98-1.12	1.25-1.37
Applicable Pipe Materials		Metal Pipes*, Plastic Pipes (UPVC, PPH, PVDF, PFA, PTFE)
Applicable Fluids		Various liquids (must not contain large amounts of solids or air bubbles)
Fluid Temperature Range		0 ~ 85°C (No icing on pipe surface)
Flow Velocity Range		Recommended: ±0.3 to 6.0 m/s, Measurable: ±0.1 to 10 m/s
Flow Rate Range
	LPM	1-20	1-30	2.5-60	2.5-100	5-200
	GPM	0.26-5.28	0.26-7.92	0.66-15.85	0.66-26.41	1.32-52.83
Language		English, Traditional/Simplified Chinese (Others customizable)
Units		Metric – meter, cubic meter, liter / Time – minute, hour, day / Imperial – feet, cubic feet, UK gallon, US gallon
Display Type		3-color backlight, 3-line 16-character LCD
Display Update Cycle		0.5s, 1s
Measurement Accuracy		±3.0% of F.S. from 10% to 100% of F.S.; ±0.3% FS from 0% to 10% of F.S.**
Display Resolution		Max resolution: 0.0001 (finest)
Power Supply		DC 24V
Power I/O Connector		Quick-release 6-pin connector (with 2-meter signal cable)
Input/Output		Analog output self-powered 10-bit 4-20mA / Modbus RTU RS485 / NPN output
Current Consumption		200mA@24V during stable operation (excluding communication current)
Protection Circuit		Reverse polarity protection, surge protection
Waterproof Rating		IP66***
Ambient Temperature		-10 ~ 60°C (No freezing)
Relative Humidity		35~ 85%RH (No condensation)
Materials		PPS+GF, PEEK, NBR, Silicon, PA66+GF, PC+GF, SS304, PMMA
Weight (g)				426g (with protective cover, without cable)	441g (with protective cover, without cable)

＊ For copper pipes, please check the outer diameter. Refer to the table below.
＊＊ Measurement accuracy tested in controlled lab conditions with set pipe and fluid conditions, zero-point calibrated, and tested at 25°C. Actual accuracy may vary in customer environments.
＊＊＊ Loosening the surrounding screws when rotating the display may affect IP66 waterproof protection.

Size

FU-ES015 / FU-ES020 / FU-ES025 / FU-ES032

Unit：mm

Model	A	B	C	D	E	F
FU-LT008	105.00	64.1	49.2	40.44	36.00	14.00
FU-LT010	105.00	67.73	57.73	40.44	40.50	19.00
FU-LT015	105.00	71.13	61.13	50.90	45.00	23.00
FU-LT020	105.00	77.63	67.63	50.90	51.50	29.00
FU-LT025	105.00	84.96	74.96	61.12	58.00	35.00