Temperature compensated ultrasonic level gauge

Product Introduction

The working principle of the HART ultrasonic level gauge is that the transducer emits ultrasonic pulses that are reflected back from the surface of the measured medium. Some of the reflected echoes are received by the same transducer and converted into electrical signals. Ultrasonic pulses propagate at the speed of sound waves, and the time interval required from emission to reception of ultrasonic pulses is proportional to the distance from the transducer to the surface of the measured medium. The relationship between the distance value S and the speed of sound and transmission time T can be expressed by the formula: S=C × T/2

Range: 0-50 meters, multiple forms to choose from, suitable for various corrosive and chemical applications, high precision, remote signal output, PLC system monitoring.

Temperature compensated ultrasonic level gaugeworking principle

Ultrasonic level gauge is a device that emits high-frequency pulse sound waves from an ultrasonic transducer (probe), which are reflected back on the surface of the measured material and converted into electrical signals by the transducer The propagation time of sound waves is directly proportional to the distance they travel to the surface of an object The relationship between sound wave transmission distance S, sound velocity C, and sound transmission time T can be expressed by the formula: S=C × T/2

Due to the certain width of the emitted ultrasonic pulses, the reflected waves in a small area close to the transducer overlap with the emitted waves, making it difficult to identify and measure their distance values. This area is called the measurement blind spot. The size of the blind spot is related to the model of the ultrasonic level gauge.

The probe emits ultrasonic waves, which are then reflected by the liquid surface and received by the probe. The distance between the probe and the liquid (object) surface is proportional to the time the ultrasonic waves have passed

Distance [m]=Time x Sound Speed/2 [m]

Temperature compensation formula for sound velocity: Environmental sound velocity=331.5+0.6 x temperature

site conditions

In any of the following situations, please note:

• Liquid/solid with foam

• There is strong voltage, strong current, and strong electromagnetic interference around, so try to avoid high voltage, high current, and strong electromagnetic interference as much as possible

• Strong winds and direct sunlight

• Strong vibration

• electrical connection

The standard instrument current output can be output in a grounded form. Explosion proof instruments must have floating current output. The instrument and grounding terminal should ensure good grounding. Usually, the grounding can be connected to the grounding point of the tank. If it is a plastic tank, it should be connected to the adjacent ground.

The 4-20mA/HART (two-wire system) power supply and output current signal share a single two core cable. Please refer to the technical data for the specific range of power supply voltage. For intrinsic safety type, a safety barrier must be added between the power supply and the instrument. The 4-20mA/HART (two-wire system) power supply and current signal are separated, each using a two core cable. Please refer to the technical data for the specific range of power supply voltage.

Temperature compensated ultrasonic level gaugeProduct Features

Automatic power adjustment, gain control, temperature compensation.

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

Adopting new waveform calculation technology to improve the measurement accuracy of the instrument.

The suppression function with interference echo ensures the authenticity of measurement data.

Multiple output forms: programmable relay output, high-precision 4-20mA current output, Rs-485 digital communication output, split ultrasonic liquid level probe

Hangzhou Aolituo Instrument Co., Ltd. specializes in the production of ultrasonic level gauges