Thermal Air Mass Flow Meters Achieve High Accuracy Measurements

Thermal air mass flowmeter achieves high-precision measurement Thermal air mass flowmeter adopts the principle of thermal diffusion, and thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. Typical sensing elements of thermal air mass flowmeters include two thermal resistors (platinum RTD), one is a speed sensor, and the other is a temperature sensor that automatically compensates for changes in gas temperature. When two RTDs are placed in a medium, where the speed sensor is heated to a constant temperature above ambient temperature, the other temperature sensor is used to sense the medium temperature. The gas mass flow through the velocity sensor is calculated from the amount of heat transfer through the sensing element. As the gas flow rate increases, the heat taken away by the medium increases. The temperature of the sensor is lowered accordingly. In order to keep the temperature constant, it is necessary to increase the operating current through the sensor, and the increased part of the current is proportional to the flow rate of the medium. The thermal air mass flowmeter is an instrument that uses the principle of heat conduction to measure fluid flow. The thermal air mass flowmeter uses the constant temperature difference method to accurately measure the gas mass flow. The thermal air mass flowmeter has the advantages of small size, high degree of digitization, convenient installation, and accurate measurement. 1. Features of thermal air mass flowmeter: 1. On-line continuous flow loading and unloading, easy maintenance of thermal air mass flowmeter; 2. Adopt proprietary technology”Balanced structure package”,Medium temperature self-compensation; 3. Proprietary algorithm, thermal air mass flowmeter can achieve high linearity, high repeatability, and high precision; 4. The range ratio is 100:1, which can be expanded according to user requirements; 5. Thermal type The air mass flowmeter can realize the measurement of large pipe diameter and small flow rate, the minimum flow rate can be measured as low as zero, and the resolution is 0.001m/s; 6. The thermal air mass flowmeter has no moving parts, and the vibration effect can be ignored; 7. Direct The requirements for the pipe section are not high 1-2D; 8. It has nothing to do with the temperature and pressure of the medium; 9. With a proprietary high-temperature algorithm, the medium temperature can reach +510°C; 10. The thermal air mass flowmeter adopts a high-humidity algorithm to achieve high-precision measurement ; 11. Input 12-point dynamic correction for the flow signal, and 10-point correction is built in the thermal air mass flowmeter; 12. Online dynamic correction current/voltage output; 13. Insensitive to small particles such as dust; 2. Thermal air mass flow Technical advantages of the meter: 1. Proprietary flow data model algorithm for thermal air mass flowmeter; fuzzy theory control temperature and humidity algorithm; 2. High-performance intelligent microprocessor and analog-to-digital and digital-to-analog conversion chips; 3. Wide range ratio 100:1; large diameter, low flow rate, pressure loss can be ignored; 4. Directly measure mass flow, thermal air mass flowmeter does not need temperature and pressure compensation; 5. Low flow rate measurement is very sensitive; 6. Thermal air mass flowmeter design , Easy to select, easy to install and use; 7. Thermal air mass flowmeter is suitable for all kinds of single or mixed gas flow measurement.

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