Abstract: Ultrasonic level gauges are widely used in water environment, acid-base, mud, food and other environments.
      The ultrasonic level gauge is a digital level gauge controlled by a microprocessor. In the measurement, pulsed ultrasonic waves are emitted by the sensor, and the sound waves are reflected by the liquid surface and then received by the same sensor and converted into electrical signals. The ultrasonic level gauge has functions such as automatic power adjustment, temperature compensation, and anti-interference. Due to the non-contact measurement, the measured medium is almost out of control. Ultrasonic level gauges are widely used in water environment, acid-base, mud, food and other environments.

Precautions when using the ultrasonic level gauge
1. Scope and size The size
      of the object to be detected by the ultrasonic level gauge directly affects the maximum range of the ultrasonic sensor. The sensor must detect a certain level of sound before it can be output. The large part can reflect most of the sound to the ultrasonic sensor, so that the sensor can detect this part at its farthest sensing distance. Small parts can only reflect a small part of the sound, resulting in a greatly reduced sensing range.
Second, the
      object to be detected The ideal object for ultrasonic detection using ultrasonic level gauge should be large, flat and high-density, and perpendicular to the front of the converter. The most difficult objects to detect are objects that are small in size and made of sound-absorbing materials (such as foam rubber), or objects that are at a certain angle to the transducer. It is possible to detect some difficult-to-detect objects by allowing the sensor to detect the surface of the background and then reflect the detection target object between the sensor and the background.
      If the liquid level is stationary and perpendicular to the sensor surface, it is easy to detect the liquid. If the liquid level fluctuates greatly, the response time of the sensor can be prolonged, so as to take the average of the fluctuation changes to obtain a more consistent reading. However, ultrasonic level gauges cannot accurately detect foamy liquids because the foam will deflect the sound propagation direction.
3. Vibration
      Ultrasonic liquid level gauge, whether it is the vibration of the sensor itself or the vibration of the nearby machine, may affect the accuracy of measuring distance. Rubber anti-vibration devices can be used in the installation of ultrasonic level timing to reduce such problems. Sometimes rails can also be used to eliminate or greatly reduce component vibration.
Fourth, the attenuation
      sensor is also designed with a temperature compensation function to adjust the slow change of the ambient temperature. However, it cannot adjust temperature gradients or rapid changes in ambient temperature.
5. False test results
      Objects near the ultrasonic level gauge (such as rails or fixed rods) may reflect sound waves. To accurately detect the target object, the influence of nearby sound reflecting surfaces must be reduced or eliminated. In order to avoid false detection of nearby objects, the ultrasonic level meter is equipped with LED display, which is used to instruct the operator during installation to ensure the correct installation of the sensor and reduce the risk of false detection.