Technical Tips on Ultrasonic Level Gauges

1. Overview of Ultrasonic Level Gauges

Ultrasonic level gauge (ultrasonic level meter) is a digital level instrument controlled by a microprocessor. During measurement, ultrasonic waves are emitted by the sensor (transducer), reflected off the surface of the object, and received by the same sensor, where they are converted into electrical signals. The distance from the sensor to the measured object is calculated based on the time between transmission and reception of the ultrasonic waves. Since the ultrasonic level gauge uses a non-contact measurement method, the measured medium is almost unrestricted, making it widely applicable for measuring the height of various liquids and solid materials, as well as for distance measurement. In addition to the intelligent LCD display on the local head, the DY series ultrasonic level gauge (ultrasonic level meter) also outputs a standard analog signal of 4-20 mA or high/low alarm (optional RS232 and RS485 digital signal outputs in the latest models).

2. Working Principle of Ultrasonic Level Gauges

Under the control of a microprocessor, the ultrasonic sensor transmits and receives ultrasonic waves, and the distance s between the sensor and the measured object is calculated from the propagation time t of the ultrasonic wave in air. Since the speed of sound in air (c) is constant, s can be calculated using the formula s = ct/2. Furthermore, because the distance H from the sensor to the bottom of the container is fixed, the level (liquid or solid) h = H - s.

3. Technical Features

Ultra-low cost, high reliability, and high accuracy, fully capable of replacing equivalent imported ultrasonic level gauges.
No professional technicians required; one-point setup is sufficient for application. The instrument is easy to install on-site, simple to adjust, and requires minimal maintenance.
The ultrasonic level gauge (ultrasonic level meter) features automatic power adjustment, gain control, temperature compensation, and employs advanced detection and calculation technologies to improve measurement accuracy. It also includes interference echo suppression to ensure the authenticity of measurement results.

SMD technology is used to enhance instrument reliability.

Automatic power adjustment, gain control, and temperature compensation.

Advanced detection technology and rich software functions adapt to various complex environments.

Interference echo suppression ensures the authenticity of measurement data.

The sensor is made of PTFE material, suitable for various corrosive environments.

A new waveform calculation technology is adopted to improve measurement accuracy.

16-bit D/A conversion improves the accuracy and resolution of current output.

Multiple output forms: multi-point switching output, high-precision 4-20 mA current output, RS-232 and 485 digital communication outputs.

4. Application Fields
      The ultrasonic level gauge (ultrasonic level meter) is an advanced non-contact level measurement instrument that can fully replace various traditional level gauges of other types. It is mainly used to measure liquids such as river water levels, wastewater levels, tank liquid levels, slurry, oil levels, coal piles, ores, etc., and is widely applied in wastewater treatment, municipalities, power plants, chemical plants, steel mills, pharmaceutical factories, and breweries. The corrosion-resistant ultrasonic level gauge is used to measure various acidic and corrosive liquids.