Background
Ultrasonic level gauges are a series of non-contact, high reliability, low price, maintenance-free level gauges. Completely solve the winding caused by pressure transmitter, capacitive float and other measurement methods. Leakage, contact with media and other issues. Expensive maintenance and other troubles. Ultrasonic level gauges can meet most liquid level measurement requirements in closed or open containers without contacting industrial media. The level gauge sensor is of great significance to sewage treatment.
Now, with the development of science and technology, ultrasonic level measuring instruments can measure the range of several centimeters to tens of centimeters. It also showed extraordinary ability under harsh conditions. Because sewage contains many kinds of chemical substances. And the water temperature and turbidity are both high. Sewage and mist are highly corrosive. This greatly shortens the life of the conventional contact liquid level detector equipped on the sewage tank. In addition, due to inaccurate liquid level detection, sewage overflow or discharge often occurs. Affects production, but also brings great inconvenience to later operators and instrument maintenance personnel. Therefore, the emergence of ultrasonic level gauges has greatly solved these problems.
Working principle
The ultrasonic level gauge is installed perpendicular to the surface of the measured object. It uses a high-power voltage oscillator as a probe to periodically emit pulsed ultrasonic waves to the surface of the object to be measured. The ultrasonic sensor receives the signal reflected from the surface of the measured material level. The signal is selected and processed by the transmitting circuit, and the time required for the ultrasonic pulse to be sent to return is obtained. The transmitter calculates the distance from the surface of the measured object to the sensor based on this time, and outputs a standard signal (4-20mA). DC completes the functions of remote display, recording, alarm interlocking and self-adjustment of liquid level.