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Product Details
Product Introduction
The HM-DSL2 is a portable acoustic Doppler velocimeter from HM Instruments designed for professional unidirectional flow velocity and discharge measurement in open channels, rivers, and partially filled pipes. Based on the acoustic Doppler principle combined with the velocity-area method, it provides single-direction 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 at 3% ±0.5 cm precision. The instrument features a 3.5-inch capacitive touchscreen with 480 × 320 resolution, a quad-core processor running Android 4.4.2, and 6 GB of onboard storage capable of logging up to 1 million data points. Built-in GPS positioning, WiFi, Bluetooth, Type-C and aviation connectors, along with Modbus/RS485 communication, deliver comprehensive connectivity for field operations. The 8.4 V 6000 mAh lithium battery and ultra-low 0.8 W operating power ensure extended field sessions. At $929, the HM-DSL2 offers an outstanding balance of touchscreen convenience, GPS capability, and professional measurement performance for hydrological and environmental monitoring.
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
Environmental water body assessment — lake and reservoir inflow/outflow velocity profiling
Functional Performance
Unidirectional flow velocity and discharge measurement using acoustic Doppler principle and velocity-area method.
Velocity range 0 to 6 m/s with ±1.0% ±1 cm/s accuracy for reliable single-direction monitoring.
Water depth measurement 0.03 to 5 m with 3% ±0.5 cm precision for accurate cross-sectional profiling.
3.5-inch capacitive touchscreen with 480 × 320 resolution for intuitive field operation and real-time data review.
Quad-core Android 4.4.2 platform enabling smooth operation and future software extensibility.
6 GB onboard storage supporting up to 1 million data records — ideal for long-term unattended deployment.
GPS positioning for automatic geotagging of each measurement station and survey waypoint.
WiFi and Bluetooth wireless connectivity for data transfer and peripheral device pairing.
Modbus/RS485 communication protocol for integration with SCADA and telemetry systems.
8.4 V 6000 mAh lithium battery with ≤0.8 W operating power and ≤0.14 W standby for extended field sessions.
Flow velocity correction and water level correction functions for measurement accuracy optimization.
Auto-storage interval configurable from 5 s to 3600 s, with Type-C Excel export for streamlined reporting.
Main Parameters
| Parameter | HM-DSL3 (Flagship) | HM-DSL2 (Touchscreen) ★ | HM-DSL1 (Keypad) |
|---|---|---|---|
| Velocity range | 0 ~ 6 m/s | 0 ~ 6 m/s | 0.02 ~ 6 m/s |
| Velocity accuracy | ±1.0% ±1 cm/s | ±1.0% ±1 cm/s | ±1.0% ±1 mm/s |
| Depth range | 0.03 ~ 5 m (opt. 10 m) | 0.03 ~ 5 m | 0.03 ~ 10 m |
| Flow direction | Bidirectional | Unidirectional | Unidirectional |
| Display | 3.5-inch touchscreen | 3.5-inch touchscreen | 2.8-inch color LCD |
| Battery | 6000 mAh | 6000 mAh | 1800 mAh |
| Data storage | 1,000,000 records | 1,000,000 records | 10,000 records |
| GPS | Yes | Yes | No |
| Communication | WiFi / BT / RS485 | WiFi / BT / RS485 | RS485 |
| Price | $2,000 | $929 | $786 |
Technical Parameters
| Parameter | Specification |
|---|---|
| Measurement principle | Acoustic Doppler, velocity-area method |
| Velocity range | 0 ~ +6 m/s |
| Velocity accuracy | ±1.0% ±1 cm/s |
| Depth range | 0.03 ~ 5 m |
| Depth accuracy | 3% ±0.5 cm |
| Temperature range | -10 ℃ ~ 60 ℃ |
| Temperature accuracy | ±1 ℃ |
| Instantaneous discharge | 0 ~ 99.99 m²/s |
| Cumulative discharge | 0.1 m² ~ 9,999,999 m² |
| Acoustic frequency | 2 MHz |
| Blanking distance | 6.5 ~ 7 cm |
| Flow direction | Unidirectional |
| Display | 3.5-inch capacitive touchscreen, 480 × 320 |
| Processor | Quad-core, Android 4.4.2 |
| Power supply | DC 10 ~ 15 V |
| Working current | 80 ~ 180 mA @ 12 V |
| Battery | 8.4 V 6000 mAh lithium |
| Operating power | ≤ 0.8 W |
| Standby power | ≤ 0.14 W |
| Storage | 6 GB, 1,000,000 records |
| Wireless | WiFi, Bluetooth |
| Wired interfaces | Type-C, aviation connector |
| Communication protocol | Modbus / RS485 |
| GPS | Built-in |
| Corrections | Velocity correction, water level correction |
| Auto-storage interval | 5 s ~ 3600 s |
| Sleep timeout | 15 s / 30 s / 1 min / 2 min / 5 min / 10 min / 30 min / Always on |
| Data export | Type-C to Excel |
| Protection rating | Not IP65 (IP65 on DSL3 only) |
| Host dimensions | 176 × 85 × 38 mm |
| Host weight | Approx. 310 g |
| Measuring rod | φ20 × 1 m |
| Standard cable | 20 m |
| Package | Iron case, 5.9 kg |
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