Plug in thermal mass gas flowmeter is an instrument used to measure gas flow rate. Widely used in the petrochemical industry, power industry, steel industry, pharmaceutical industry, environmental protection industry and other fields.
1. Working principle
Based on the principle of thermal diffusion. When gas flows through the sensor, it takes away heat, causing a change in the temperature of the sensor. By measuring the relationship between the temperature difference of the sensor and the gas flow rate, the mass flow rate of the gas can be obtained.
2. Structural characteristics
① Sensors usually adopt an insertable probe structure, which can be directly inserted into pipelines for measurement. It is easy to install, has low pressure loss to pipelines, and is suitable for pipelines of various diameters without the need for large-scale pipeline modification.
② There are no mechanical moving parts inside, which avoids measurement errors and failures caused by mechanical wear and blockage, improves the reliability and stability of the instrument, and also reduces maintenance costs and workload. The overall structure is relatively compact, occupying small space, making it easy to install and use in places with limited space.
3. Performance characteristics
① High precision measurement: It can achieve high-precision measurement of gas mass flow rate, with a measurement accuracy generally ranging from ± 1% to ± 3%, which can meet the requirements for accurate measurement of gas flow rate in most industrial production processes.
② Wide range ratio: The range ratio can usually reach 10:1 to 100:1, allowing for accurate measurement over a large flow range. It can measure both small and large flow rates, adapting to changes in gas flow rates under different operating conditions.
③ Quick response: With a fast response time, it can reflect changes in gas flow rate in real time. Generally, the response time can be between milliseconds and seconds, providing accurate flow data for industrial production processes in a timely manner, making it easy to adjust and control the production process in a timely manner.
④ Good repeatability: Under the same measurement conditions, the deviation between multiple measurement results is small, and the repeatability is good, ensuring the consistency and reliability of the measurement results, which is conducive to improving the stability of the production process and the consistency of product quality.
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