Principle of external level gauges

Thread Content

Principle of external level gauge: The external level gauge operates on the principle of echo in the time domain of ultrasonic pulses. The ultrasonic sensor of this gauge emits ultrasonic pulses, which travel through the liquid after passing through the bottom of the tank. Upon reaching the interface between the liquid and gas, these pulses are reflected and return to the detector. An external level gauge determines the height of the liquid by calculating the time difference and the speed of ultrasound propagation in the liquid. This measurement method of external level gauges truly enables non-invasive sensing by \"penetrating through the wall.\" When using an external level gauge, there is no need to make holes in the container, making it particularly suitable for applications involving high pressure, severe corrosion, or toxic and hazardous conditions. 　　Technical advantages of external level gauges: External level gauges represent a true non-invasive measurement technology, with their sensors installed at the bottom and side walls of the container ； Fast, reliable, and high-precision container volume measurement ； Easy to install, without the need to damage the container ； There is no need to shut down the equipment during the installation of the external level gauge ； External level gauges have no moving parts and require almost no maintenance. 　　Two compact external level gauge ultrasonic sensors are installed, one at the bottom of the tank and the other on its side wall, to compensate for changes in density. The signal from the external level gauge sensor is processed by a microprocessor and sent to either a local display or a user control system. It is possible to calculate the height of the liquid in the tank as well as its volume.