Ultrasonic Level Measurement

Ultrasonic Level Measurement

Ultrasonic level measurement is a continuous, non-contact method based on acoustic time-of-flight. A transducer emits an ultrasonic pulse toward the product surface and measures the return echo; the elapsed time is converted to distance and then to level using vessel geometry. Instruments are available as compact devices or as separate sensor/transmitter arrangements for harsh environments and long ranges.

Ultrasonic technology is often selected for its practicality and cost effectiveness across a broad set of duties. It is well suited to liquids, pastes, sludges, and many bulk solids, and it avoids wetted probes that can foul or corrode. In many services it is also tolerant of changing material properties (e.g., density and dielectric behavior), supporting stable trending without frequent recalibration. Endress+Hauser

Application limits are tied to sound propagation. Heavy vapors, strong temperature gradients, foam, turbulence, dust, or condensation can weaken echoes or introduce measurement noise, so temperature compensation, mounting strategy, and echo evaluation settings matter. Dead zones near the sensor face and interference from fill streams or internal structures should be addressed during nozzle and layout design.

Typical applications include water and wastewater basins, pump stations, chemical tanks, and open-channel flow measurement where level is a proxy for flow. In bulk solids, ultrasonic is used for bins and hoppers with moderate dust and where the surface behavior is reasonably reflective to sound. It is also useful where non-contact measurement is preferred but radar is unnecessary or cost-prohibitive.

Ultrasonic transmitters integrate through standard analog and digital outputs for continuous indication, control, and alarming, often with onboard diagnostics to support maintenance planning. When installed with clear acoustic paths and appropriate compensation, ultrasonic level measurement delivers dependable performance with low mechanical complexity.

Field Instruments & Controls, Inc. an exclusive authorized representative of sales and service for Endress+Hauser.