FD-XS20 Keyence Clamp-On Ultrasonic Flow Sensor Head 20 L/min

Product Introduction

• FD-XS20 is a clamp-on ultrasonic flow sensor head from Keyence.
• It measures flow from outside the pipe. No cutting. No pressure loss.
• Maximum rated flow rate reaches 20 L/min on larger pipe sizes.
• It supports metal pipes and plastic pipes, soft or hard.
• It handles water, oil, adhesive, grease, and chemical solutions.
• Fluid temperature range: 0 °C to 100 °C. No freezing on the pipe surface.
• Rated IP65/IP67/IP68G for harsh plant conditions.
• Best fit: tight spaces, retrofits, and inline monitoring without pipe modification.

Technical Specifications

• Brand: Keyence
• Model: FD-XS20
• Series: FD-X clamp-on flow sensor series
• Module type: Sensor head with clamp set
• Measurement range (flow): 0 to 15.00 L/min for 3/8″ (9.53 mm), Ø10, Ø10.5 pipes
• Measurement range (flow): 0 to 20.00 L/min for Ø12, 1/2″ (12.7 mm), Ø13.8 pipes
• Frequency response: 50 ms / 500 ms selectable response time
• Sensitivity / zero cut flow rate: 0.10 L/min standard; 40 mL/min high resolution
• Linearity / repeatability: F.S. ±0.1% (plastic pipe, 50 ms); F.S. ±0.15% (metal pipe, 50 ms)
• Resolution: 0.001/0.01/0.1 L/min standard; 0.1/1/10 mL/min high resolution
• Shot amount resolution: 0.001/0.01/0.1 L standard; 0.001/0.01/0.1/1 mL high resolution
• Hysteresis: Variable
• Integrated unit display: 0.01 to 100 L standard; 0.1 to 10000 mL high resolution
• Display method: Status indicator
• Temperature range (fluid): 0 °C to 100 °C (pipe surface)
• Temperature range (ambient): -10 °C to 60 °C. No freezing.
• Humidity: 35% to 85%RH. No condensation.
• Environmental resistance: IP65/IP67/IP68G enclosure rating
• Anti-interference (vibration): 10 to 55 Hz, 1.5 mm amplitude, 2 h per axis
• Anti-interference (shock): 50 G, 11 ms, 3 times per axis
• Sensor head material: PPS/PPSU body, PPS amplifier, PVC cable, PPS/PBT/POM connector
• Clamp set material (plastic pipe): PPS body, special rubber detection surface, FKM support rubber, SUSXM7 screws
• Clamp set material (metal pipe): SUS304/SUSXM7 metal, special rubber detection surface, FKM support rubber, SUSXM7 screws
• Weight: Approx. 260 g

Installation Guide

• Pick the clamp set that matches your pipe material and outer diameter.
• Plastic pipe clamp sets: FD-XC20R1, FD-XC20R2, FD-XC20R3, FD-XC20R4.
• Metal pipe clamp sets: FD-XC20M1, FD-XC20M2.
• Clean the pipe surface. Remove dirt, oil, and rust.
• Mount the sensor head on a straight pipe section. Keep flow steady at the measuring point.
• Tighten the fixing screws evenly. Do not over-tighten.
• Keep the detection surface in full contact with the pipe.
• Route the cable away from power lines and inverters.

Setup and Maintenance

• Set the response time to match your process: 50 ms for fast tracking, 500 ms for stable readings.
• Choose standard or high resolution mode on the controller.
• Set the zero cut flow rate to suppress small drift near zero.
• Use the status indicator for quick health checks.
• Wipe the detection surface during scheduled maintenance.
• Check clamp screw tightness after pipe vibration or thermal cycles.
• No moving parts inside the pipe. Maintenance stays simple.

Compatibility

• Works with metal pipes and plastic pipes, soft or hard.
• Pipe sizes: 3/8″ (9.53 mm), Ø10, Ø10.5, Ø12, 1/2″ (12.7 mm), Ø13.8.
• Fluids: water, oil, adhesive, grease, and chemical solutions.
• Use the correct clamp set for each pipe material. This keeps accuracy within spec.
• Pairs with the FD-X series controller for display and output.

Certifications and Standards

• Enclosure rating: IP65/IP67 per IEC60529.
• Enclosure rating: IP68G per JIS C0920.

Packing List

• FD-XS20 sensor head, 1 pc
• Clamp set for your pipe type, 1 set (order code separately)
• Sensor head fixing screws, included in clamp set
• Instruction manual, 1 copy

FAQ

• Q: Can I install it without stopping the line?
• A: Yes. The clamp design allows mounting on an existing pipe. No cutting is needed.
• Q: Why is my reading noisy at low flow?
• A: Small bubbles or vibration can cause this. Switch to 500 ms response and set a higher zero cut value.
• Q: Which clamp set should I order first?
• A: Measure the pipe outer diameter and note the material. Then match it to the R or M clamp list.
• Q: Does pipe material affect accuracy?
• A: Yes. Metal and plastic pipes have different repeatability specs. Always use the matching clamp set.
• Q: How often should I recalibrate?
• A: Most users check once a year. Recheck after pipe replacement or major process changes.
• Q: Can it measure adhesive or grease?
• A: Yes, the rated fluid list includes adhesive and grease. Keep fluid temperature within 0 to 100 °C