HM-DSL1 Acoustic Doppler Velocimeter

Product Introduction

The HM-DSL1 is a portable acoustic Doppler velocimeter from HM Instruments designed for cost-effective 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 provides unidirectional flow monitoring with a velocity range of 0.020 to 6.00 m/s at ±1.0% ±1 mm/s accuracy, and water depth measurement from 0.03 to 10 m at 0.3% ±0.5 cm precision. The instrument features a 2.8-inch color LCD display with digital keypad control for straightforward field operation, a built-in pressure water level sensor, and a temperature sensor covering -10 ℃ to 60 ℃ at ±0.1 ℃ accuracy. With 10,000-record onboard storage and USB flash drive data export, the HM-DSL1 makes data management simple and efficient. The 1800 mAh rechargeable lithium battery delivers over 8 hours of continuous operation at under 2.4 W power consumption, while RS485 communication supports integration with SCADA systems. Housed in a durable aluminum alloy carrying case, the HM-DSL1 offers dependable measurement capability at an accessible $786 price point.

Applications

• River and stream discharge measurement — hydrological surveys 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 networks

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

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

• Environmental monitoring — seasonal water body flow tracking and ecological survey support

Functional Performance

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

2. Velocity range 0.020 to 6.00 m/s with ±1.0% ±1 mm/s accuracy and 1 mm/s resolution.

3. Water depth measurement 0.03 to 10 m with 0.3% ±0.5 cm precision and 1 mm resolution.

4. 2.8-inch color LCD display with digital keypad for intuitive field operation and data review.

5. Instantaneous discharge range 0.001 to 9999 m³/h and cumulative discharge 0.001 to 9999 m³, both at ±3% accuracy.

6. 10,000-record onboard storage with USB flash drive data export for convenient data management.

7. 1800 mAh rechargeable lithium battery providing over 8 hours of continuous operation at under 2.4 W power consumption.

8. Built-in pressure water level sensor and temperature sensor for comprehensive measurement.

9. Temperature range -10 ℃ to 60 ℃ with ±0.1 ℃ accuracy and 0.1 ℃ resolution.

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

11. 20 m standard cable enabling flexible deployment in various channel configurations.

12. 1 Hz refresh rate for real-time monitoring with aluminum alloy carrying case for transport protection.

Main Parameters

Technical Parameters

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