What Is an Ultrasonic Liquid Level Sensor?

In industrial, agricultural, and environmental monitoring, accurate liquid level measurement is critical for operational safety, resource management, and process optimization. The Ultrasonic liquid level sensor—often referred to interchangeably as an Ultrasonic level gauge or Ultrasonic level transmitter in practical applications—has become a reliable solution.

It enables non-contact measurement, avoiding medium contamination and equipment wear. RIKA SENSOR's RKL-03 Ultrasonic Level Transmitter is a typical representative of such devices, combining high reliability, cost-effectiveness, and easy installation to support Ultrasonic liquid level monitoring across scenarios including agricultural irrigation, water treatment, and chemical storage. Compliant with CE-EMC, CE-LVD, RoHS, and ISO9001 certifications, this device meets global quality standards, making it a trusted choice for industrial and environmental applications.  

An ultrasonic liquid level sensor is a non-contact device designed to measure the level of liquids (and in some cases, solids) using ultrasonic technology.

The device emits ultrasonic pulses via a built-in transducer. These pulses travel through air (or other gaseous media) to the liquid surface. Upon contacting the surface, the pulses reflect back to the transducer. The device calculates the time interval between the transmitted and received pulses, and converts this time difference into distance using a preset ultrasonic propagation speed—ultimately determining the liquid level height.

- Non-Contact Measurement: No direct contact with the liquid medium is required, eliminating risks of corrosion, clogging, or medium contamination. It is suitable for harsh scenarios such as corrosive liquids in chemical plants and urban sewage.  

- Measurement Range: Offers 5 range options—5m, 10m, 15m, 20m, and 30m—adapting to diverse scenarios from small wells to large reservoirs and rivers.  

- Measurement Accuracy & Resolution: Accuracy ranges from 0.5% to 1%, and resolution is ±3mm or 0.1% FS (whichever is larger), meeting precision requirements for critical scenarios like water treatment process control.  

- Power Supply: Supports 3 power supply options: 24VDC, 220VAC, and 12VDC (only applicable for RS485 output).  

- Output Modes: Includes two output methods—4-20mA (2-wire/4-wire) and RS485 (4-wire)—enabling seamless integration with universal data logging systems (e.g., RIKA's RK600 Data Logger) or existing industrial control platforms.  

- Protection Rating & Operating Temperature: The probe has an IP68 ingress protection rating, and the display unit has an IP66 rating. The probe operates within a temperature range of -20℃ to +80℃, while the display unit operates from -20℃ to +60℃, making it suitable for complex environments like outdoor agricultural irrigation and reservoir monitoring in cold regions.  

- Housing Material: Uses anti-aging and corrosion-resistant engineering plastics; for explosion-proof requirements, cast aluminum material is available, extending the device's service life in harsh environments.  

- Operation & Control Functions: Equipped with an English LCD display for real-time level reading, and supports menu settings (including reference zero point, alarm points, response time, and communication parameters) to simplify on-site calibration and operation.

This device supports continuous level tracking and serves as a core component for efficient Ultrasonic liquid level monitoring, adapting to applications such as river level monitoring in hydrological projects and chemical tank level management in industrial scenarios.

An ultrasonic liquid level is a type of non-contact liquid level measurement device. It calculates liquid levels through the emission and reflection of ultrasonic pulses, avoiding the limitations of contact-type devices (e.g., susceptibility to corrosion and contamination).

RIKA SENSOR's RKL-03 Ultrasonic Level Transmitter adapts to diverse scenarios including agricultural irrigation, water treatment, chemical production, and reservoir monitoring, thanks to its multi-range options, precise measurement performance, high protection rating, and user-friendly operation design. Compliant with multiple global certification standards, it provides reliable support for Ultrasonic liquid level monitoring in various fields, making it an ideal choice for scenarios requiring accurate liquid level data and durable equipment.