External ultrasonic flowmeter

The product term of external ultrasonic flowmeter does not appear very frequently, so some small partners who have just entered the automation industry do not know much about this product. But I believe everyone must have heard of the clamp-on and external-attached ultrasonic flowmeters. These are actually similar products, but they are called differently. The external ultrasonic flowmeter, like his family, also uses the 'time difference method' measurement principle, that is, the ultrasonic signal is generated by the sending sensor and dissipated in the air flow. The signal passes through the pipe wall and the fluid to the receiving sensor, and at the same time , The receiving sensor emits the same ultrasonic signal, and the signal passes through the pipe wall and the fluid to the sending sensor. At this time, because of the time difference due to the flow velocity, the flow velocity can be calculated based on the time difference, and then the flow rate can be calculated. The structure of ultrasonic flowmeter is mainly divided into ultrasonic signal generator, signal receiver, information processing circuit, and flow display. Among them, the ultrasonic signal generator first sends a signal, receives the sensor to receive the signal, obtains the time difference, and processes the ultrasonic information according to the information processing circuit, transmits the flow to the display screen in the form of an electrical signal and displays the result. The external ultrasonic flowmeter mainly has the following advantages: 　　 1. Non-contact measurement method, small size, light weight, easy to carry 2. The sensor is easy to install, suitable for measuring various sizes of pipe sound conducting media 3. Need to destroy the pipeline, no need to stop production 4. Built-in rechargeable battery, can work continuously for more than 12 hours 5. Compact and sturdy, internationally advanced die-cast aluminum host 6. Automatic memory for the first 64 days, the first 64 months, and the accumulation of the first 5 years Flow 7. Backlit LCD display in Chinese to display instantaneous flow and positive, negative, static cumulative flow, flow rate, time, analog input and other data. Due to the non-contact measurement principle of external ultrasonic flowmeter, there will be many advantages in selection. For example, the measured medium does not have too high requirements, but the accuracy of the measurement is relatively low compared to other flowmeters. This is the main disadvantage of an ultrasonic flowmeter. Since there are not many requirements for the selection, let's talk about his installation.　　 The installation distance of the external ultrasonic flowmeter is based on the distance between the innermost edges of the two sensors. The distance calculation method is to first enter the required parameters in the menu, check the number displayed in the window, and install the sensor according to this data.　　 There are four installation methods of external ultrasonic flowmeter. They are V method, Z method, N method and W method. The V method is preferred for pipelines below DN200, the Z method is preferred when there is no signal or the signal quality is poor, and the Z method is preferred for pipelines above DN200 or cast iron pipes. N method and W method are less used methods, usually suitable for installation of thin pipes below DN50.　　V method: Under normal circumstances, the V method is a relatively standard installation method, which is easy to use and accurate in measurement. During installation, the two sensors are aligned horizontally, and the center line is horizontal to the axis of the pipeline. The measurable pipe diameter ranges from DN15 to DN400.　　Z method: The Z method is the most commonly used installation method. It is characterized by direct transmission of ultrasonic waves in the pipeline, no reflection (called single sound path), and minimum signal attenuation loss. The Z method can measure the diameter of the pipe from 100mm to 6000mm. During the actual installation on site, it is recommended that the Z method should be used for pipes larger than 200mm (so the measured signal is the largest).　　 I don’t know much about the external ultrasonic flowmeter here. If you have any questions, I can introduce you to a place-Kaidi Sensing Technology Co., Ltd. is a professional instrument production company. There are professional engineers in-house to guide you in the selection, and the installation problems on the spot can also be solved for you. Those who want to know more about the external ultrasonic flowmeter may wish to try it.

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