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Keyence FD-H20 Clamp-On Ultrasonic Flow Meter: Non-Invasive Pipe Tracking and Field Performance
Quick Answer: The Keyence FD-H20 is a clamp-on ultrasonic flow meter designed for non-invasive flow measurement on metal and plastic pipes from DN15 to DN100. It tracks flow rate, total flow, and pipe temperature without cutting pipes or stopping the process. For many industrial applications, a similar or better result can come from our own Silver Automation Instruments clamp-on meters, often at a shorter lead time and with direct factory support.
What the FD-H20 Really Does on a Pipe
The FD-H20 sensor pair clamps onto the outside of a pipe. It sends an ultrasonic wave through the pipe wall and the liquid inside. The flow rate comes from the transit-time difference upstream and downstream. No drilling, no tapping, no pipe shutdown. We have seen this work well on clean water, cooling water, chemical feeds, and some light oil lines. Engineers like it because there is zero contact with the fluid and zero pressure drop. The display unit shows real-time flow rate and total flow. It also logs data for later download.
Non-Invasive Pipe Tracking Specs You Need to Know
The FD-H20 works on pipe outer diameters from 16 mm to 300 mm. That covers a practical range from DN15 up to DN100 in standard schedule pipes. Pipe materials it supports include stainless steel, carbon steel, copper, PVC, and some lined pipes. The display unit can store measurement points along a pipeline, creating a simple non-invasive tracking map. You can mark multiple sensor locations and record flow rates over time. This feature helps in heat exchanger monitoring, cooling loop balancing, and water network audits. The meter compensates for pipe wall thickness automatically. Just input the material and outer diameter, and the transmitter does the calculation.
Flow Accuracy and Liquid Conditions a Site Engineer Cares About
The published accuracy for the FD-H20 is ±2% of reading under stable conditions. In practice, the actual field accuracy depends on pipe surface condition, straight run, and bubbles. Most engineers in our customer base in Southeast Asia and the Middle East get repeatability around ±1% once the installation is dialed in. The liquid must be relatively clean. Suspended solids above 10,000 mg/L or high aeration will degrade the signal. The temperature range for the sensor surface is -20 °C to 80 °C. Liquid pressure does not affect the measurement because the sensor is outside the pipe. That makes it a safe choice for high-pressure lines up to 10 bar or more, provided the pipe wall stays intact.
Outputs, Power, and Integration into Your Control System
The FD-H20 transmitter comes with a 4-20 mA analog output, two relay outputs, and an RS-422 digital link. A USB port allows data transfer to a PC. There is no native Modbus RTU or HART on this model. That is a limitation we see customers run into. An external converter is often needed to get the data into a PLC or SCADA system. The unit runs on 100 to 240 VAC mains, which simplifies panel wiring. The display is a monochrome backlit LCD, easy to read in a control cabinet but not as bright as modern color touchscreens used on our Silver Instruments clamp-on flow meters.
Where the FD-H20 Fits and Where It Does Not
We have seen this meter used effectively in HVAC water balancing, boiler feed water monitoring, and RO permeate flow measurement. In one case, a paint manufacturer in Vietnam used the FD-H20 to track cooling water flow across six production lines without any pipe modification. The main complaints we hear from distributors in Africa and the Middle East are about the cost of spare sensor sets and the limited pipe diameter range. Once you go above DN100, you need a different Keyence model entirely. That is a gap many sites face when they have mixed line sizes. Our clamp-on ultrasonic flowmeters often cover DN15 to DN6000 with a single transmitter type, which reduces spare parts inventory.
Installation Tips from Real Field Work
The pipe surface must be clean, free of paint flakes, rust, and loose material. A thin layer of coupling gel applied to the sensor wedge makes the signal stable. Do not install the sensor directly after an elbow or a pump. A straight upstream run of 10 pipe diameters and downstream run of 5 diameters is the minimum. The FD-H20 sensor holders use a magnetic base on steel pipes, which speeds up temporary measurements. On PVC and copper pipes, use the supplied stainless steel bands and tighten evenly. We have seen many installation errors come from uneven band tension. That leads to signal noise and unstable readings.
Comparing Keyence FD-H20 with Silver Instruments Clamp-On Meters
The FD-H20 is a solid instrument for small pipe applications. When customers ask us for an alternative with Modbus RTU, data logging to USB flash, or for larger pipe sizes up to DN6000, we point to our own silver series clamp-on ultrasonic flow meters. They offer a 4-line backlit display, password-protected setup, and a wider selection of outputs including 4-20 mA, RS485 Modbus, OCT pulse, and relay. Built-in data storage for 32 GB on some models helps remote sites without a SCADA link. Lead time from our factory in China is typically 3 to 5 working days for standard models, and express shipping to Lagos, Jeddah, Bangkok, or Sydney takes another 4 to 6 days. That is often faster than regional Keyence distributors can offer for the FD-H20.
Concrete Applications Where This Meter Delivers Value
Cooling water loops in plastic injection molding plants. Boiler feed water in small food processing factories. Thermal oil secondary circuits where pipe cutting is prohibited. Non-invasive flow tracking in pharmaceutical water for injection (WFI) lines where purity must be maintained. In all these cases, the FD-H20 has proven reliable. The data log export in CSV format helps site managers create reports without manual readings. We have helped customers in the Middle East set up the same CSV export on our own meters, with the added benefit of direct Excel integration via USB flash drive, no proprietary software needed.
How to Get a Quote for an FD-H20 or a Comparable Silver Instruments Meter
If you need the Keyence FD‑H20, we can source it through our partner network. If you want a fully comparable clamp‑on flow meter with shorter lead time and local language support in Spanish, Arabic, or Portuguese, send us your pipe size (DN), pipe material, fluid type, temperature (°C), and flow range (m³/h or L/min). We will provide a technical proposal and price within 24 hours. Email [email protected], call +86-135-1213-1526, or message us on WhatsApp at 86-135-12131526. WeChat is also available at +86 13512131526. Ask for a cost comparison with the FD‑H20 and a PDF datasheet for our clamp‑on ultrasonic flow meter.
FAQ
Q: Can the Keyence FD-H20 measure flow on a vertical pipe?
Yes, with the sensor mounted on the side. Install it where flow goes upward and the pipe is completely full.
Q: What is the shortest pipe run required before the sensor?
At least 10 diameters upstream, 5 diameters downstream. With a flow straightener, the upstream requirement reduces to 5 diameters.
Q: Does the FD-H20 work on cast iron pipes?
It is not recommended. Cast iron often has uneven wall thickness and inner scale that disrupts the ultrasonic signal. Clean steel or plastic pipes work best.
Q: How do I know if my liquid is too dirty for the clamp-on meter?
If the liquid looks cloudy with suspended solids above 10,000 mg/L or has visible bubbles, the signal will be intermittent. A sample test with a portable unit is the easiest way to confirm.
Q: Can I get Modbus output from the FD-H20 directly?
No, the FD-H20 has RS-422 output. For Modbus RTU, you will need an external converter or consider a Silver Instruments clamp-on meter with built-in RS485 Modbus.
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