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“Reliable performance in long-term satellite IoT deployment.”
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KDF1500 Series Ultrasonic Doppler Flow Velocity Meter
Introduction
The Ultrasonic Doppler Flow Velocity Meter measures based on the Doppler effect. The probe emits a beam of ultrasonic waves at an upward or forward angle. When ultrasonic waves propagate through the fluid, the fluid contains bubbles, particles, or other impurities (which can be considered to move at the same velocity as the fluid). When the ultrasonic waves encounter these impurities, the reflected waves generate a Doppler frequency shift Δf, which is proportional to the flow velocity. By measuring the Doppler frequency shift Δf, the flow velocity of the fluid can be determined.
Features
- Wide Input Voltage: 10VDC – 30VDC
- Compact Size: Self-emitting and self-receiving design significantly reduces structural dimensions; capable of measuring at low water levels
- Wide Applicability: Two tilt angles selectable, suitable for more field applications
- Two Depth Measurement Methods: Pressure-based depth measurement and backup ultrasonic depth measurement
- Signal Strength Indicator: Can identify conditions such as sediment accumulation, low water, or material adhesion
- Instantaneous Flow Calculation: Supports calculation for circular, rectangular, trapezoidal, and irregular channels
- High Resolution: Flow velocity resolution 1 mm/s
| Feature | KDF1501
Basic Version |
KDF1502
Enhanced Version |
KDF1501L
Basic Version |
KDF1502L
Enhanced Version |
| Depth Measurement | ✖ No | ✔ Yes | ✖ No | ✔ Yes |
| Tilt Angle | 34° | 34° | 0° | 0° |
| Flow Measurement Direction | Bidirectional | Bidirectional | Unidirectional | Unidirectional |
| Applicable Environment | The minimum water level must be greater than 25cm. | The minimum water level must be greater than 6cm.(For DN200–DN500 pipelines or sites where the water level is below 40cm) | ||
Dimension
| Parameter | Specification |
|---|---|
| Power Supply Supply Voltage | Supply Voltage: 10VDC-30VDC Operating Current: ≤55 mA Total Power Consumption: 0.62 W ± 0.1 W (12V supply); 0.83 W ± 0.1 W (24V supply) |
| Operating Current | RS485 / ModBus Standard Protocol |
| Measurement Performance | Flow Velocity Range: 0.03 m/s-5 m/s, -5 m/s–-0.03 m/s (customizable: ±0.03 m/s-±10 m/s) Basic Version: Users can add external level sensor; range selectable by customer Enhanced Version Pressure-based Depth Range: 0.02-3 m, 0.02-10 m (please confirm max. water depth before ordering) Enhanced Version Ultrasonic Depth Range: 0.08-3 m (default is pressure-based depth measurement) Flow Velocity Accuracy: ±(V*%1 + 0.01) m/s (Tested by the Hydrology Center) Flow Velocity Accuracy: ±1%–±3% (subject to field conditions) Water Depth Accuracy: ±3 cm Flow Velocity Resolution: 1 mm/s Temperature Resolution: 0.01 ℃ Enhanced Version Water Depth Resolution: 1 mm (3 m range), 3 mm (10 m range) |
| Physical Performance | Flow Velocity Sensor Material: POM + (ABS + PC) Cable Material: PU Weight: 2.5 kg (including 20 m cable) Protection Level: IP68 Cable: Basic Version–4-core shielded cable, diameter 4.5 mm; Enhanced Version–4-core shielded cable with vented tube, diameter 8 mm (default length 10 m, other lengths customizable) |
Cases
Oil Field Mud Pit Level Monitoring Using an Ultrasonic Sensor
Flow-Through Methane Monitoring of Bioreactor Off-Gas — New Zealand
Supply Pump Control by Ultrasonic Level Sensor — China
Dissolved Oxygen Control in Marine Aquaculture Ponds — Korea
