Ultrasonic level meters can measure solid materials, but they have significant limitations compared to measuring liquids. Below is a detailed explanation for technical support reference:
1. Working Principle
Ultrasonic level transmitters work by emitting ultrasonic pulses and calculating the distance and level based on the echo reflection time.In theory, any medium that can reflect sound waves can be measured, including solids such as granules, pellets, and coarse particles.
2. Main Challenges When Measuring Solids
Uneven surface and angle of repose
Solids usually form an inclined surface, which scatters ultrasonic waves and weakens the echo signal, leading to unstable readings or signal loss.
Dust interference
Heavy dust absorbs and attenuates ultrasound, greatly reducing measurement reliability.
Humidity, steam, and temperature changes
Ultrasonic speed is affected by temperature and air conditions, which causes errors.
Material bridging or build-up
Internal build-up may be misread as the actual material level.
3. Suitable Applications
Ultrasonic level meters are only suitable for:
Coarse granules with low dust (e.g., gravel, wood chips, plastic pellets)
Short measuring range (typically ≤ 10 meters)
Low-dust, non-high-temperature, non-steam environments
4. Unsuitable Applications
They are not recommended for:
Fine powders (cement, lime, flour, coal powder)
Heavy dust, high temperature, or high humidity
Long measuring ranges
Applications requiring high stability
5. Recommended Alternative
For reliable measurement of solids, radar level transmitters are strongly recommended. Radar is immune to dust, temperature, and humidity, and performs much better for bulk solids and powders.
Ultrasonic level meters can measure solids but are only suitable for low-dust, coarse-grained, short-range applications. For most solid applications, especially with fine powder or heavy dust, radar level meters are the preferred and more reliable solution.
Post time: Mar-17-2026