Working principle and characteristics of gas mass flowmeter

Gas mass flow meters are suitable for precise measurement of gas mass. It converts the measured gas mass flow into the corresponding gas volume flow under standard conditions or gas mass flow under standard conditions. Gas mass flowmeter has the characteristics of high precision, long life, good repeatability, wide flow range, stable and reliable, etc. The flow measurement of gas is carried out by the method of testing gas quality. The gas mass flowmeter consists of a gas flow quality sensor and a digital display integrator. The gas mass flowmeter adopts the American Microbridge gas flow mass sensor and pressure sensor. The airflow quality sensor is based on the heat transfer principle that the heat taken away by the airflow quality flowing through the sensor is proportional to its output voltage. The pressure sensor is that the pressure of the gas is proportional to the output voltage, that is, the gas mass flow and gas pressure are simultaneously converted into analog signal output. The function of the digital display integrator is to convert the airflow quality analog electrical signal output by the airflow quality sensor into a digital signal through the A/D inside the single-chip microcomputer. After calculation and processing, the mass flow rate of the gas is converted into the corresponding volume flow rate under the standard state or the mass flow rate under the standard state. After data processing and calculation, the real-time flow and cumulative flow are calculated respectively, and sent to four-digit and eight-digit digital tubes for display. The digital display integrator can also convert the gas pressure analog electrical signal output by the pressure sensor into A/D through the single chip microcomputer, and send the gas pressure value to the three-digit digital tube for display. In addition, the single-chip microcomputer can store various constants and coefficients related to the calculation process, and the data information such as the upper and lower limits of the real-time flow and the pressure upper and lower limits set manually in the EEPROM of the single-chip microcomputer for permanent storage. The microcontroller can also store the accumulated flow value into the EEPROM memory. The above data information can be automatically saved after a power failure, and can be automatically restored after the power supply is restarted.

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