EchoLogger ECT 400S echo sounder
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The EchoLogger ECT 400S is a single-beam, single-frequency (450 kHz) echo sounder for drone bathymetry in lakes, ponds and rivers up to 100 m deep, part of SPH Engineering's Integrated Systems. HobiTech supplies it in India.
Technical Specifications
| Type | SBES single-beam, single-frequency |
| Acoustic frequency | 450 kHz |
| Measurement range | 0.15–100 m |
| Beam width | 5°, conical (-3 dB) |
| Accuracy | 0.2% of the depth measurement |
| Range resolution | 1.0 mm |
| Integrated tilt/roll and temperature sensors | Yes |
| Suitable for sediment measurements | No |
Mechanical
| Weight (echo sounder, in air) | 1.3 kg |
| Weight (all components, in air) | 1.9 kg (sensor, SkyHub, altimeter, housing, cables, mountings) |
| Cable length | 2.5 m |
| Interface | RS232 with SkyHub connector |
What's in the kit
- EchoLogger ECT 400S echo sounder
- Harness with carabiner
- Stainless steel housing
- RS232 data cable for SkyHub
- Transport case
What is the EchoLogger ECT 400S used for?
The ECT 400S hangs below a drone on a harness and measures water depth directly under the aircraft. It works on one frequency, 450 kHz, with a narrow 5° beam, from 0.15 m to 100 m. Accuracy is 0.2% of the measured depth, and range resolution is 1.0 mm. Built-in tilt/roll and temperature sensors are included.
Typical jobs are water depth mapping, dredging planning and monitoring, and hydrology. SPH Engineering publishes a sample data set from Titurga Ezers lake in Latvia collected with the ECT 400S. The sounder is not designed for sediment measurement. For water with dense seaweed choose the dual-frequency ECT D24S, and for sediment thickness the ECT D052S. For acidic or aggressive liquids, see the EchoLogger ETF 400S.
How does the ECT 400S compare with other EchoLogger sounders?
| Specification | ECT 400S | ECT D24S | ECT D052S |
|---|---|---|---|
| Frequency | 450 kHz | 200/450 kHz | 50/200 kHz |
| Range | 0.15–100 m | 0.50–200 m / 0.15–100 m | 1.00–200 m / 0.50–200 m |
| Beam width | 5° | 10°/5° | 27°/7° |
| Sediment measurement | No | No | Yes |
| Echo sounder weight | 1.3 kg | 1.3 kg | 1.85 kg |
All three have 0.2% depth accuracy, 1.0 mm resolution and a 2.5 m cable.
How does it work with SkyHub, UgCS and your drone?
- SkyHub: the RS232 data cable connects to the SkyHub on-board computer, which logs the depth data. The SkyHub echo sounder software package supports the ECT 400, D24 and D052, sends real-time depth data to the ground station and logs in CSV, NMEA-0183 and SEG-Y.
- Altimeter: SPH Engineering uses an altimeter so the drone flies automatically at a set height over the water and handles tides and waves.
- UgCS: missions are planned in SPH's UgCS flight-planning software.
- Drones: DJI M400, M350 and M300, Inspired Flight IF800 and IF1200A, and WISPR RangerPro.
- Processing: Eye4Software Hydromagic Survey maps depth areas from echo sounder data.
The echosounder USB converter lets you test and configure the ECT 400S, update firmware, or run it on a surface vessel. SPH Engineering states that additional components and software must be purchased to use the ECT 400S with drones. Read more on SPH's echo sounder page. EchoLogger sounders are made by EofE Ultrasonics of South Korea (echologger.com).
Why buy the ECT 400S from HobiTech?
HobiTech is an authorised SPH Engineering partner based in Bengaluru, India. Every order comes with a GST invoice, and you have a local team for the sensor, the drone and the software. SPH's bathymetry training courses cover echo sounder data collection (BATHY-1) and processing (BATHY-2). See all sensors in our bathymetry collection.
Frequently Asked Questions
What depth range does the ECT 400S measure?
0.15 to 100 m at 450 kHz, with 0.2% accuracy of the depth measurement and 1.0 mm range resolution.
Can the ECT 400S measure sediment thickness?
No. For sediment measurement, choose the dual-frequency ECT D052S.
What is the difference between the ECT 400S and ECT D24S?
The ECT 400S uses a single 450 kHz frequency. The ECT D24S adds a 200 kHz channel that passes through seaweed and bottom vegetation and reaches 200 m.
Which drones can carry the ECT 400S?
DJI M400, M350 and M300, Inspired Flight IF800 and IF1200A, and WISPR RangerPro. The sounder weighs 1.3 kg, and all airborne components weigh 1.9 kg.
Is SkyHub included with the ECT 400S?
No. The kit includes the RS232 data cable for SkyHub, but the SkyHub computer, software package, altimeter and UgCS are bought separately.
How do I buy the EchoLogger ECT 400S in India?
Use Request a quote on this page, or call HobiTech on +91 70225 26509. We confirm the price and configuration, and every order comes with a GST invoice.