Accurate liquid level detection with ultrasonic sensors
Connecting Terminals,Micro Connecting Terminal,Aluminum Connecting Terminals,Connecting Copper Terminal Taixing Longyi Terminals Co.,Ltd. , https://www.longyicopperlugs.com
The laboratory is also increasingly using automated equipment to perform the tasks of testing and inspection, such as testing analytical reagents, sample pipetting, and so on. The sensors used in these jobs should be able to work accurately and provide traceable results, while also having a high detection speed. For example, in a liquid media inspection station, an important step is to fill a small glass tube with a liquid medium for inspection and analysis, such as pouring blood for analysis. After a small amount of test sample is poured into a small test tube, the liquid level of the liquid medium in the micro test tube needs to be detected before the test analysis starts. These tiny microbial culture vessels have small openings, and some microbial culture vessels have a diameter of only 3 mm, but still require the sensor to accurately detect the volume of liquid medium in the bottle in the shortest amount of time. The currently used capacitive sensing technology does not achieve the desired detection accuracy. Although the photoelectric sensors that are independently set up meet the requirements of detection accuracy, they are expensive.
An ultrasonic sensor is a detection sensor that is completely out of contact with the medium being contacted. This feature is very useful in laboratory applications: it ensures that the sensor is not corroded and that the measured medium does not cross-contaminate. In addition, the ultrasonic sensors are also very insensitive to the humidity and dust of the surrounding environment, thus ensuring their long-term, stable and accurate operation.
Compared with photoelectric sensors, ultrasonic sensors do not generate light, but use sound waves for detection, so it can reliably detect media of different properties regardless of the transparency and color of the measured media. Regardless of the viscosity of the measured medium, it will not affect the test results.
The continuously operating ultrasonic sensor emits a cone-shaped sound wave to the object to be measured. This cone of sound wave can just enter the bottle mouth with a diameter of less than 10mm to detect the level of the liquid in the bottle. In order to avoid the limitation of other factors during use, the manufacturer and the user have closely combined to develop a new type 09 ultrasonic sensor. The new ultrasonic sensor is equipped with a specially designed ultrasonic transmitter that allows the emitted ultrasonic beam to be smaller in diameter and can be inserted into a 3mm diameter flask. Depending on the form of the structure, such an ultrasonic sensor can be configured as a sensor for vertical detection or horizontal detection. The ultrasonic transmitter can also be easily removed and replaced, which greatly facilitates the cleaning operation of the sensor.
The accuracy and repeatability of this sensor is very high, up to 0.1mm; its shortest detection time is only 7μs. Since the sensor housing has a diameter of only 9 mm, it can be well arranged on the entire flask. In this way, the same number of ultrasonic sensors can be set according to the number of rows of cultivating bottles in the tray, and one row of cultivating bottles can be detected at a time, thereby further improving the detection speed and shortening the detection time.
The same ultrasonic sensor can also be used to review the size of the empty space in the upper part of the flask. In this way, one type of sensor can be used to perform the liquid level inspection and review tasks.
Even in production processes outside the laboratory, such ultrasonic sensors have a wide range of uses. For example, it can detect if a tablet is in place, or if a drug is placed in a blow molded package.