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Quick Answer: The Keyence FD-Q series is a non-contact clamp-on digital liquid monitor kit for small and medium pipe sizes such as DN15 to DN50. It detects liquid flow from the outside of the pipe and gives a 4-20 mA signal or an IO-Link output on some versions. If you need a stocked clamp-on flow meter with totalizer, pulse, RS485, and support in Southeast Asia or Australia, Silver Automation Instruments offers direct alternatives with wider pipe coverage.
The Keyence FD-Q series mounts on the outside of a pipe. It does not contact the liquid. The kit includes a sensor head, a controller, and mounting straps. Typical pipe sizes are DN10, DN15, DN20, DN25, DN32, DN40, and DN50 depending on the model. The unit displays flow rate in liters per minute. Output options include 4-20 mA and IO-Link on selected models.
The FD-Q series works with water, light chemicals, coolants, and some washdown fluids. It is used for pump protection, chiller flow confirmation, and filter clogging detection. Installation is quick because there is no pipe cutting. The sensor clamps on a clean straight pipe section. A food plant in Malaysia used an FD-Q style monitor on a 25 mm return line to confirm cleaning water flow before starting a CIP cycle.
The FD-Q series is not a mass flow meter. It does not measure kg/h. It is not approved for gas or steam. Accuracy is lower than a full ultrasonic or electromagnetic flow meter. The clamp-on sensor needs a stable pipe wall and a clean surface. Air bubbles, heavy solids, and temperature swings can reduce repeatability. Some models are not rated for ATEX Zone 1 areas.
We have seen customer sites where a non-contact monitor works for weeks and then drifts because the pipe surface gets hot. A paint manufacturer in Thailand used an FD-Q style monitor on a 25 mm solvent line. The reading shifted after the pipe temperature crossed 40 degrees Celsius. They moved to a Silver Instruments electromagnetic flow meter with PTFE liner and got stable 4-20 mA output. In practice, most engineers skip the full IO-Link setup and use the basic analog signal for pump interlock.
Silver Instruments supplies clamp-on ultrasonic flow meters for liquid lines from DN15 up to DN6000. These meters mount on the outside of the pipe. They measure flow in both directions. Output options include 4-20 mA, pulse, and RS485 Modbus RTU. Accuracy is 1.0 percent of reading on most models. The transmitter accepts a wide range of liquid temperatures. We stock units for water, seawater, diesel, and light chemicals. The clamp-on sensor works with carbon steel, stainless steel, PVC, and HDPE pipe.
For customers who compare Keyence FD-Q kits with Silver products, the main difference is data logging and totalization. The Silver clamp-on ultrasonic meter has a built-in totalizer. It stores daily, monthly, and yearly flow volumes. The Keyence FD-Q is mainly a flow switch and indicator. Both are non-contact, but the Silver unit is closer to a process flow meter. A water treatment plant in Indonesia uses a Silver clamp-on ultrasonic meter on a DN80 raw water line. The meter sends 4-20 mA to a PLC and logs daily intake volume. The Keyence FD-Q kit would not give the totalizer function they needed.
A common replacement for a Keyence FD-Q20C on a DN20 line is the Silver Instruments SUP-1158 clamp-on ultrasonic flow meter. This model supports pipe diameters from DN15 to DN100. The standard output is 4-20 mA plus pulse. RS485 Modbus RTU is optional. The sensor works from 0 to 60 degrees Celsius standard and up to 120 degrees Celsius with a high temperature bracket. The transmitter enclosure is IP66. For a 25 mm PVC pipe, set the unit to pipe outer diameter 32 mm. The meter reads flow in liters per minute and gives a total flow in cubic meters.
The Keyence FD-Q series suits simple liquid flow confirmation. Pump protection, chiller loops, and filter monitoring are common. The Silver clamp-on flow meter suits the same jobs plus total flow reporting. For food and beverage plants in Australia, a non-contact meter avoids product contact. The Silver clamp-on meter is available with a stainless steel junction box for washdown areas. For desalination plants in the Middle East, we recommend an electromagnetic flow meter if the line runs full. A clamp-on ultrasonic meter is a good fit for temporary flow surveys on existing seawater pipes.
When you ask for a price, please include your pipe size in DN or inches, pipe material, liquid type, flow range, pressure in bar, and temperature in Celsius. This helps us recommend the right sensor. Most customers in Southeast Asia and Latin America receive a quote within 24 hours on business days. We ship to Australia, Vietnam, Indonesia, the Philippines, Saudi Arabia, the United Arab Emirates, Chile, Peru, South Africa, and Nigeria.
You can reach Silver Automation Instruments at Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. Tell us if you are replacing a Keyence FD-Q series or need a new clamp-on flow meter kit. We will confirm the correct pipe transducer size and output.
Can the Keyence FD-Q series measure total flow volume?
The standard FD-Q series is a flow monitor and indicator. It is not a totalizer in most configurations. If you need total flow in cubic meters, choose a clamp-on ultrasonic flow meter from Silver Instruments with a built-in totalizer.
What pipe sizes does the Keyence FD-Q series support?
The FD-Q series covers small and medium pipe sizes. Typical models cover DN10, DN15, DN20, DN25, DN32, DN40, and DN50. Silver Instruments offers clamp-on meters for DN15 up to DN6000.
Can I use the Keyence FD-Q on chilled water lines?
Yes, the FD-Q series works on chilled water lines. Set the sensor on a straight pipe section away from valves. For long term total flow data, the Silver clamp-on ultrasonic meter gives extra logging functions.
Does Silver Instruments stock a direct replacement for the Keyence FD-Q20C?
Yes. The Silver Instruments SUP-1158 clamp-on ultrasonic flow meter is a common replacement for DN15 to DN50 pipes. It provides 4-20 mA, pulse, and optional RS485 Modbus RTU.
What is the price difference between Keyence FD-Q kits and Silver clamp-on meters?
The price depends on pipe size and output options. Request a quote with your pipe material and flow range. We will send you a technical proposal with lead time to your country.
