Portable ultrasonic sounder Measuring Water Depth Without Contacting the Bottom

Portable ultrasonic sounder is a device that utilizes ultrasonic technology to measure water depth, featuring a measurement range of 0–120 meters, a blanking distance (dead zone) of ≤0.5 meters, and a minimum display resolution of 0.1 mm. It is suitable for use in various bodies of water—including reservoirs, lakes, rivers, and shallow seas—and is employed in applications such as hydrological surveys, waterway mapping, and commercial fishing.

Portable ultrasonic sounder is a water depth measurement device based on the principles of ultrasonic ranging. During operation, the instrument positions an ultrasonic transducer either at the water's surface or at a specific depth underwater. Ultrasonic waves propagate through the water at a constant speed; upon encountering the waterbed, they reflect back toward the transducer. By measuring the time elapsed between the transmission and reception of the ultrasonic signal—and factoring in the speed of sound—the instrument automatically calculates the precise water depth. This non-contact measurement method eliminates the need for direct physical contact with the waterbed, offering significantly higher efficiency and safety compared to traditional methods utilizing sounding lines or sounding rods.

In terms of technical specifications, the Portable ultrasonic sounder typically features a measurement range of 0–120 meters and a blanking distance of ≤0.5 meters. The instrument offers 32 adjustable levels of transmission power and incorporates an automatic gain control (AGC) function, allowing it to automatically optimize signal performance based on the specific aquatic environment and depth. The minimum display resolution reaches 0.1 mm, with a measurement accuracy ranging from ±0.5% to ±1% of the full scale. The device features a full-color LCD screen with a Chinese-language interface; it operates within a frequency range of 200 to 2000 kHz, allows for on-site configuration via the main unit's keypad, comes pre-calibrated from the factory, and supports subsequent field calibration.

Portable ultrasonic sounder is widely applicable for depth measurement across various bodies of water, including reservoirs, lakes, rivers, and shallow coastal areas. In the field of water conservancy engineering, the device enables personnel to perform tasks such as reservoir capacity estimation, river cross-section profiling, and dredging volume calculation. In the maritime and port sectors, port and waterway management authorities utilize the equipment to conduct routine depth inspections of shipping channels, facilitating the timely identification of shoals or silted areas and enabling the prompt scheduling of dredging operations to ensure navigational safety. Furthermore, this device is applicable to a wide range of scenarios—including marine navigation, depth monitoring in aquaculture waters, pre-dive depth surveys, and underwater positioning during scientific expeditions—demonstrating exceptional adaptability across various applications.

The Portable ultrasonic sounder is capable of taking measurements in still water and operates stably in water bodies with flow velocities not exceeding 5 meters per second. The device can be mounted either on the exterior or interior of a small vessel's hull; the sensor cable typically ranges from 5 to 10 meters in length. The main unit weighs between 300 and 800 grams, allowing for effortless operation by a single individual. Equipped with a high-capacity internal storage module, the instrument enables the export of measurement data via a USB interface in either Excel or CSV format, facilitating subsequent data analysis and post-processing on a computer. In terms of power supply, the unit utilizes a built-in rechargeable battery, making it ideally suited for field operations and extended periods of continuous use.