Ultrasonic flow sensor FL

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Product Overview
The FL Series Flow Sensor uses ultrasonic measurement to provide accurate, non-invasive and leak-free liquid flow monitoring for mission-critical cooling systems. Designed for continuous operation, it is suitable for data center thermal management including primary cooling loops and secondary/Technology Cooling System (TCS) loops such as CDUs and cold plates. Its low pressure drop and accuracy (≤ 1.0% full scale) enable precise coolant control to improve cooling efficiency and lower Power Usage Effectiveness (PUE).

Key Capabilities

• High accuracy ≤ 1.0% full scale: enables tighter flow control and energy savings
• Very low pressure drop: minimizes impact on system hydraulics
• Leak-proof, non-intrusive design: secure flow measurement without system penetration
• No moving parts: maintenance-free operation and long service life
• Bubble robustness: sustained measurement stability in aerated liquids
• Optional integrated temperature sensor: real-time coolant monitoring with compact footprint
• Multiple materials, sizes and communication options: adapt to diverse architectures

Applications

• Data center CDUs and cold plates
• Chillers and process cooling
• HVAC and commercial refrigeration
• Industrial liquid cooling and thermal systems

Downloads (names only)

• FL Series Flow Sensor Datasheet
• FL Series Flow Sensor PDF Drawing
• FL Series Flow Sensor STEP Drawing

Technical Specifications

• Technology: Ultrasonic
• Flow Range: Up to 400 l/min
• Diameter (pipe size): DN8 (1/4”) to DN40 (1 1/2”)
• Body Material: SS 316 & SS 304
• Connections: G & Tri Clamp
• Target Media: Deionized Water + up to 50% Glycol
• Temperature of Medium: -20° C to 90° C (non-freezing)
• Ambient Temperature: -20° C to 80° C
• Storage Temperature: -40° C to 80° C
• Working Humidity: 0 to 100% Non-Condensing
• Media Pressure: Up to 16 bar (232 psi)
• Accuracy: ≤ 1.0% full scale
• Flow Sensor Refresh Time: 250 ms
• Pressure Drop: < 50 mbar @ 40 l/min
• Communication Interface: 4-20 mA, 0-10V & Modbus
• Electrical Connection: M12
• Supply Voltage: 13-33 V DC & 5 V DC
• Optional Integrated Temperature Sensor: <2 seconds response time with ±0.3 K accuracy
• Certifications/Standards: IP65 & UL60730