HM-DSL3 Acoustic Doppler Velocimeter

Product Introduction

The HM-DSL3 is a portable acoustic Doppler velocimeter from HM Instruments engineered for professional flow velocity and discharge measurement in open channels, rivers, and partially filled pipes. Utilizing the acoustic Doppler principle combined with the velocity-area method, it delivers bidirectional flow monitoring with a velocity range of 0 to 6 m/s at ±1.0% ±1 cm/s accuracy, and water depth measurement from 0.03 to 5 m (customizable to 10 m) at 3% ±0.5 cm precision. The instrument integrates a 3.5-inch capacitive touchscreen with 480 × 320 resolution, a high-performance quad-core processor running Android 4.4.2, and 6 GB of onboard storage capable of logging up to 1 million data points. Equipped with GPS positioning, WiFi, Bluetooth, Type-C and aviation connectors, and Modbus/RS485 communication, the HM-DSL3 provides comprehensive connectivity for field and remote monitoring applications. Its IP65-rated enclosure, 8.4 V 6000 mAh lithium battery, and ultra-low 0.8 W operating power ensure reliable performance in demanding outdoor environments. At $2,000, the HM-DSL3 offers a compelling balance of professional-grade measurement capability and field-ready durability.

Applications

• River and stream discharge measurement — hydrological surveys, flood monitoring, and water resource assessment

• Open channel flow monitoring — irrigation canals, drainage ditches, and stormwater conduits

• Partially filled pipe flow — municipal wastewater and industrial effluent monitoring

• Irrigation management — flow distribution measurement across agricultural water distribution networks

• Municipal sewage discharge — compliance monitoring at wastewater treatment plant outfalls

• Sponge city infrastructure — low-impact development stormwater flow data collection

• Hydrological station deployment — long-term river gauge and rainfall-runoff correlation studies

Functional Performance

1. Bidirectional flow velocity and discharge measurement using acoustic Doppler principle and velocity-area method.

2. Velocity range 0 to 6 m/s with ±1.0% ±1 cm/s accuracy across forward and reverse flow directions.

3. Water depth measurement 0.03 to 5 m standard, customizable to 10 m, with 3% ±0.5 cm precision.

4. 3.5-inch capacitive touchscreen with 480 × 320 resolution for intuitive field operation and data review.

5. Quad-core Android 4.4.2 platform enabling smooth multi-tasking and future software extensibility.

6. 6 GB onboard storage supporting up to 1 million data records — ideal for long-term unattended deployment.

7. GPS positioning for automatic geotagging of each measurement station and survey waypoint.

8. IP65 ingress protection ensuring dust-tight and water-jet-resistant operation in harsh field conditions.

9. Dual wireless connectivity — WiFi for data transfer and Bluetooth for peripheral device pairing.

10. Modbus/RS485 communication protocol for integration with SCADA and telemetry systems.

11. 8.4 V 6000 mAh lithium battery with ≤0.8 W operating power and ≤0.14 W standby for extended field sessions.

12. Flow velocity correction and water level correction functions for measurement accuracy optimization.

Main Parameters

Technical Parameters

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