Wall mounted ultrasonic flow meter

Ultrasonic flow meter - fixed wall mounted type is used for long-term online measurement of various liquids. The host and sensor are installed separately, and the sensor is installed on the pipeline to be measured. The host and sensor are connected with a dedicated cable for ultrasonic flow meters, making it the most widely used ultrasonic flow meter at present.

Equipped with a temperature sensor, it can also achieve heat (cold) quantity measurement function, which can monitor the heat (cold) quantity in real-time.

The clamp type or pipe section type ultrasonic flowmeter is an instrument that measures the liquid flow rate inside a circular tube based on the principle of "velocity difference method". Adopting advanced multi pulse technology, signal digital processing technology, and error correction technology, the flowmeter is more suitable for industrial field environments, making measurement more convenient, economical, and accurate. The product has reached the advanced level at home and abroad, and can be widely used in fields such as petroleum, chemical industry, metallurgy, electricity, water supply and drainage.

Advantages of ultrasonic flow meters:

Ultrasonic flow meter is a non-contact instrument that can not only measure the flow rate of large diameter media, but also measure media that are difficult to contact and observe. Its measurement accuracy is very high, almost unaffected by various parameters of the measured medium. Especially, it can solve the flow measurement problems of highly corrosive, non-conductive, radioactive, and flammable and explosive media, which cannot be solved by other instruments.

Disadvantages of ultrasonic flow meters:

At present, the main shortcomings are that the temperature range of the measured fluid is limited by the temperature resistance of the ultrasonic transducer aluminum, the coupling material between the transducer and the pipeline, and the original data of the sound propagation velocity of the measured fluid at high temperatures. Furthermore, the measurement circuit of ultrasonic flow meters is more complex than that of general flow meters. This is because in general industrial measurements, the flow rate of liquids is often a few meters per second, while the propagation speed of sound waves in liquids is about 1500m/s. The change in velocity (flow rate) of the measured fluid changes the amount of change in sound velocity, which is also an order of magnitude of 10 to 3. If the accuracy of measuring flow velocity is required to be 1%, the accuracy of sound velocity measurement needs to be in the range of 10-5-10-6. Therefore, it requires a complete measurement circuit to achieve this. This is also a fact that ultrasonic flow meters only have integrated circuits. The reason for its practical application is based on the rapid development of technology.

The ultrasonic flowmeter consists of three parts: an ultrasonic transducer, an electronic circuit, and a flow display and accumulation system. The ultrasonic emission transducer converts electrical energy into ultrasonic energy and transmits it to the fluid to be tested. The ultrasonic signal received by the receiving device is amplified by an electronic circuit and converted into an electrical signal representing flow for display and accumulator display and accumulation. This achieves traffic detection and display.

The piezoelectric components of ultrasonic flow meter transducers are often made into circular thin plates that vibrate along the thickness direction. The diameter of the plate is more than 10 times the thickness to ensure the directionality of the vibration. Lead zirconate titanate is mostly used as piezoelectric element material. In order to fix the piezoelectric element and inject ultrasonic waves into the fluid at an appropriate angle, it is necessary to place the element in a sound wedge to form the entire transducer (also known as the probe).