What is the composition and working principle of a hot wire air flow meter?

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1. Structure and Principle of Mass Flow Meter

The structure and principle of a mass flow meter are as follows: Structure: The mass flow meter is mainly composed of a sensor and a converter. The sensor part is responsible for measuring the mass flow rate of the fluid passing through, and it usually includes a heating element and one or more temperature detection elements. The converter is responsible for converting the signals measured by the sensors into standard electrical signals for display, recording, or control. Principle: The mass flowmeter adopts the principle of thermal sensing measurement. Specifically, the heating element in the sensor will heat the fluid, and the fluid molecules will take away some of the heat during the flow process. By measuring the temperature changes of the heating element and the temperature distribution of the fluid passing through, the heat carried away by the fluid can be calculated, and then the mass flow rate of the fluid can be calculated. Thermal measurement: The mass flow meter calculates the mass flow rate by measuring the heat carried away by the fluid. This method is not affected by changes in fluid temperature and pressure, and therefore has high measurement accuracy. Direct measurement: Compared with conventional volumetric flow meters, mass flow meters can directly measure the mass flow rate of fluids without the need for indirect methods such as calibration, conversion, and compensation. High precision: Due to the use of advanced measurement principles and precise sensor design, mass flow meters have high measurement accuracy and stability. Widely used: Mass flow meters are widely used in fields such as petroleum processing and chemical engineering, especially in

2. Composition and working principle of hot wire air flow meter? The basic components of a flowmeter include a platinum hot wire that senses air flow, a temperature compensation resistor (cold wire) that corrects based on intake temperature, a control circuit that controls the hot wire current, and a housing. According to the different installation locations of platinum hotlines inside the housing, they can be divided into mainstream measurement methods installed in the main air channel and side channel measurement methods installed in the adjacent air channel. A hot wire air flow meter operates by utilizing the cooling effect of air flowing through a hot metal wire. Place a platinum wire hot wire in the intake air flow, and when a constant current passes through the platinum wire to heat it, if the air flowing around the platinum wire increases, the temperature of the metal wire will decrease. If the temperature of the platinum wire needs to be kept constant, the current of the heating wire should be adjusted according to the air flow rate. The larger the air flow rate, the greater the required current. Meaning: This flowmeter adopts an isothermal hot wire method, with RH, RK, RA, and RB forming the four arms of the Wheats

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