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Clamp On Flow Meter Keyence FD-Q Series: External Smart Fluid Sensors
Quick Answer: The Keyence FD-Q Series is a clamp-on fluid sensor for small tube applications. It works well for low-flow liquid monitoring in labs, semiconductor tools, and medical devices. For industrial water, wastewater, chemical, and food process lines with pipe sizes DN15 and above, Silver Automation Instruments offers clamp-on ultrasonic flow meters that cover wider ranges at a lower cost. Send us your pipe size, fluid type, temperature, and signal output requirement to get a specific quote within 24 hours.
What the Keyence FD-Q Series Does Well
The FD-Q is an external smart fluid sensor. You clamp it onto the outside of a tube or small pipe. It does not contact the liquid. The sensor detects flow rate by measuring the heat transfer effect caused by the fluid movement. This thermal method works best with clean liquids that have stable thermal conductivity. Keyence engineers built the FD-Q for tube outer diameters from 4 mm up to 25 mm. The smallest detectable flow is around 0.5 mL per minute. Max flow rate on the FD-Q20 model reaches 20 000 mL per minute. The response time is fast, often below 0.5 seconds. Output options include an analog 4-20 mA signal and a digital pulse output. The device also has an integrated display and push-button setup. It is compact, lightweight, and needs no pipe cutting. Because the sensor is external, it avoids pressure drop in the pipe system. A paint manufacturer in Southeast Asia tested the FD-Q for solvent dosing on 6 mm PTFE tubing. They achieved repeatability within ±2 % of reading, which was sufficient for their batch control.
Limitations in General Industrial Use
The FD-Q is built for small tubes. It cannot handle pipe sizes above 25 mm outer diameter. This rules out most process piping in water treatment, chemical plants, and food factories, where DN50, DN80, or DN100 pipes are common. The thermal measurement principle is sensitive to fluid thermal properties. A change in fluid type or even a shift in liquid viscosity from a 10 °C temperature swing can shift the calibration. Engineers have to recalibrate on site every time the process liquid changes. Fluids with low thermal conductivity, like some oils or glycol-water mixes, reduce measurement accuracy. The sensor also cannot work on metal pipes with thick walls. The stainless steel or carbon steel pipes common in industrial plants block the thermal signal. Keyence designed the FD-Q mainly for plastic, rubber, and thin-walled glass tubes. The price per measurement point is high when compared to clamp-on ultrasonic flow meters for larger pipe sizes. In practice, most industrial sites that need a clamp-on flow meter look for a device that mounts on existing steel or PVC pipes from DN15 up to DN6000 without cutting or welding.
Silver Instruments Clamp-On Ultrasonic Flow Meters: Practical Alternative
Silver Automation Instruments supplies clamp-on ultrasonic flow meters that work on pipe sizes from DN15 to DN6000. The principle is transit-time ultrasonic measurement. Two external transducers send and receive ultrasonic signals through the pipe wall and the flowing liquid. The meter calculates flow velocity from the time difference. No contact with the fluid means zero pressure loss, no contamination risk, and no moving parts to maintain. This method works on water, wastewater, seawater, oils, chemicals, and food-grade liquids. Pipe materials can be carbon steel, stainless steel, PVC, HDPE, and even concrete-lined steel. Our model FD-3100C handles fluid temperatures from -30 °C to 160 °C. Accuracy is ±1 % of reading for most applications. Output options include 4-20 mA, pulse, RS485 Modbus, and HART. The transmitter enclosure is IP66 rated. A desalination plant in Oman installed eight Silver Instruments clamp-on ultrasonic meters on DN150 and DN200 brine and permeate lines. They had no pipe downtime during installation. The engineers at the plant said the signal stability in high-salinity water was better than their previous insertion magmeter. A beverage factory in Vietnam uses our clamp-on meter on a DN50 stainless steel pipe to measure syrup at 80 °C. They needed no hygienic flange modification. Clamp-on transducers simply strapped onto the existing pipe outer surface. That
Quick Comparison: Keyence FD-Q vs Silver Instruments Clamp-On Ultrasonic Flow Meter
The FD-Q is a specialist sensor for micro-tubing and small batch processes. Its strength is ultra-low flow detection down to 0.5 mL per minute on small plastic tubes. But it stops at 25 mm outer diameter. The Silver Instruments clamp-on ultrasonic flow meter starts at DN15 (around 21 mm outer diameter for standard pipe) and goes up to DN6000. The ultrasonic meter covers flow velocities from 0.01 m/s to 12 m/s. The FD-Q needs frequent recalibration if fluid properties change. Ultrasonic meters are less affected by thermal conductivity shifts because the measurement principle relies on acoustic velocity differences, not heat dissipation. The FD-Q typically has a higher unit cost for measuring a single small tube. Silver Instruments meters are factory-calibrated for multiple pipe sizes and liquids. Most water, wastewater, and chemical processes do not need milliliter-per-minute resolution. They need reliable totalization, data logging, and remote communication. Our meters offer Modbus RTU and HART as standard options. The FD-Q digital output is mostly pulse. For many industrial end users and EPC contractors in the Middle East, Africa, and Latin America, the total cost of ownership of a single clamp-on ultrasonic flow meter on a main process line is lower than deploying multiple small FD-Q units on branch tubing.
How to Choose the Right Clamp-On Flow Meter for Your Process
Most engineers skip the brochure and start with a sketch of the pipe. You need to know five things: pipe outer diameter and material (steel, PVC, HDPE), pipe wall thickness, fluid type and concentration, normal and maximum temperature, and the signal output your PLC or DCS expects. Our application engineers use these five data points to check transducer compatibility, signal attenuation, and the best mounting method, either V-mount for small pipes or Z-mount for large pipes. Because we sell into over 40 countries, we also confirm the power supply available, 24 V DC or 220 V AC. If the pipe has internal scale or old coating, we specify a larger transducer that can punch through the loss. The installation itself takes less than two hours on a straight pipe section with 10 diameters upstream and 5 diameters downstream straight run. No hot work permit is required. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range to get a specific model recommendation. Reach us via Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, or WeChat: +86 13512131526. You will typically get a quotation within the same business day.
FAQ: 5 Key Questions Before You Buy a Clamp-On Flow Sensor
Can a clamp-on flow meter measure dirty water or slurry? Most clamp-on ultrasonic meters handle turbid water and light slurry with up to 5 % solids content. Transit-time meters require some acoustic conductivity. Excessive bubbles or heavy solids will reduce signal quality. Let us know the total suspended solids (mg/L) in your water, and we will check feasibility.
What pipe materials are suitable? Carbon steel, stainless steel, copper, PVC, HDPE, and ductile iron all work. Galvanized pipe with a thick internal zinc layer sometimes causes signal scatter. Concrete-lined pipes need special low-frequency transducers, which we can supply on request.
Do I need to stop the flow to install the sensor? No. External clamp-on sensors mount on the pipe outer surface while the process is running. You apply couplant gel, strap the transducer, and connect the transmitter. No pipe cutting, welding, or flange insertion.
What is the typical lead time for Silver Instruments clamp-on flow meters? Standard models ship within 3 to 5 working days from our Nanjing warehouse. Meters needing custom calibration for specific fluid or pipe material may take 7 to 10 working days. We use DHL, FedEx, and sea freight depending on your location and urgency.
How do I get support after installation? We provide remote commissioning via WhatsApp video call or TeamViewer. Our engineers can check signal waveforms, optimize transducer spacing, and verify totalizer settings. We also supply PDF manuals, wiring diagrams, and Modbus register maps by email.
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