How did the thermal mass flowmeter develop step by step?

This is how thermal mass flowmeters originally developed. With the rapid development of science and technology, mass flowmeters have been paid more and more attention. As an important type of mass flowmeters, thermal mass flowmeters have been widely concerned by customers! Then, thermal mass flowmeters How did it develop step by step? A thermal mass flowmeter is a flow meter that measures the mass of a liquid or gas by using the relationship between the energy required to raise the temperature of the liquid to a certain value during heating and the mass of the liquid. It is generally used to measure the mass flow rate of gases such as gas. It has the characteristics of small pressure loss, large flow range, high precision, high repeatability, high reliability, small size, easy maintenance and not easy to damage. The early thermal mass flowmeter directly put the ring and temperature measuring element into the liquid to contact with the liquid. It is a contact flowmeter. Due to the common problems of corrosion, wear and explosion protection in the field environment, its industrial application is restricted. a great restriction. By the 1950s, a boundary layer flowmeter that was not in contact with the liquid was proposed, which overcomes the shortcomings of the contact flowmeter, but the measurement results are affected by the medium parameters (such as thermal conductivity, ratio, viscosity) and the vibration of the environment. and so on. By the 1970s, the heat-distribution thermal mass flowmeter based on measuring the temperature distribution of liquids was favored in China due to its unique advantages, but it had a fatal shortcoming, that is, it only detected tiny flows, and was only suitable for small Pipe diameter measurement, large diameter liquid measurement it is helpless, it is on the basis of these flowmeters, people have designed a plug-in thermal mass flowmeter, it has been developed rapidly in China, can be used for Measure gas flow in large pipe diameters. In the past, thermal mass flowmeters were mainly thermally distributed, and were used in the measurement of small gas flow rates. They were mostly used in the semiconductor industry, heat treatment furnaces, analytical instruments, etc. for the measurement and control of hydrogen, oxygen, ammonia and other flowmeters, as well as for the measurement of leakage in the valve manufacturing process. amount etc. In recent years, the application of intrusive and insertion thermal flowmeters with heat dissipation effect, environmental protection and large and medium-sized pipelines in the process industry have developed rapidly in foreign countries. The detection rods composed of multiple groups of detection elements arranged radially and segmented are mostly used in large and medium-sized pipelines in HVAC (heating ventilation and air conditioning) projects in the form of insertion. It is also used to monitor the total amount of SO2 and NOX emissions in the boiler large pipe air intake and flue exhaust. Although the micro-liquid mass thermal flowmeter has a history of more than 20 years, its industrial application has not developed rapidly until recent years. Now several manufacturers have produced various types of thermal distributed thermal flowmeters and put them on the market. It is believed that the Chinese flowmeter market will be more prosperous in the future. Since the mass flowmeter is generally relatively simple in application, it can be put into use after simple debugging as long as it is installed correctly. In daily use, you only need to adjust the zero point of the meter regularly, and there is almost no need for maintenance, and you need to pay attention to it when using it. The success of the flowmeter application is directly related to the installation. In addition to the normal installation requirements, special attention should be paid to reducing the impact of vibration, because the mass flowmeter works based on the principle of vibration, and external vibration will introduce interference. However, as little external interference as possible is undoubtedly beneficial to the measurement, so the vibration from the pipeline and the site environment should be avoided as much as possible. The mass flow meter has high accuracy and its price is also high, which requires careful maintenance, such as equipping it with a high-quality regulated power supply, and frequent inspections of on-site vibration and operating conditions, etc., to ensure the safety of the meter and the instrument. . During the use of the instrument, it is necessary to carry out accurate zero point calibration under the conditions of use. The mass flow meter belongs to the height measuring instrument used on-line. The drift of the zero point will affect the measurement results. It must be calibrated regularly during long-term use. It is necessary to avoid the occurrence of exceeding the range of the instrument used, which will cause a decrease in the measurement accuracy of the instrument, and in severe cases, it will cause damage to the instrument. For example, operations such as steam sweeping that exceed the operating temperature range of the instrument will damage the detection coil and make the instrument unusable. Usually, when using the mass flowmeter, it is necessary to prevent artificial power failure and disconnection. Take the method of cutting off the power and disconnecting the signal line so that the flowmeter does not measure for a short time, which will cause measurement disputes. Such problems should be paid attention to. The solution is to lock the instrument box, and a special person is responsible for the management.

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