thermal flow

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1. Principle of measuring temperature of fluid air

How to detect hot wire and hot film air flow meters Questioner: Netizen | 2020-10-15 I will answer the best answer Answerer: Netizen 2020-10-19 Thermal Mass Flowmeters, also known as TMF, is an instrument for detecting fluid mass flow. There are two different measurement principles, but both can be summarized as "thermal". One of the principles is to heat the part of the pipeline through which the fluid flows, and measure it by using the temperature field changes when the fluid flows through the heating pipeline; Another measurement principle is to heat the fluid itself and use the relationship between the energy required for fluid temperature rise and the fluid mass for measurement.

2. Principle of Thermal Mass Flow Meter The above two principles for measuring fluid mass are both attributed to heating, one heating the fluid flowing through the pipeline and the other heating the fluid. Overall, the detection of fluid mass is achieved through the exchange of heat between the fluid and the heat source.

. Thermal mass flow meters are commonly used to detect the quality of gases. During the gas flow process, two thermistors are passed through. The first thermistor that flows through acts as a heater to maintain a constant temperature difference with the gas. Therefore, the higher the gas flow rate, the greater the current supplied to the circuit. The second thermistor that flows through acts as a temperature detection element to detect the gas temperature. Therefore, the flow rate of the gas can be determined by the functional relationship between the current supplied by the circuit and the supply current and gas flow rate.

III. Principle of Therm

al Mass Flow Meter - Advantages and Disadvantages.

Thermal mass flow meters have low pressure loss and a wide flow range; Not equipped with moving parts, simple structure, high accuracy; Disagree with 9583 other respondents: Netizens 2020-10-19 Hot wire and hot film air flow meters have similar structural characteristics, that is, there is a hot wire or hot film in each intake channel. The working principle of these two sensors is also very similar, and they both need to be able to work under the condition of power supply. Both of them convert the intake volume into the output voltage, so the detection methods of these two air flow meters are basically the same. They can be detected during engine operation or after being removed and connected to the power supply according to their working requirements. The requirements for the working power supply, wiring harness socket form, and testing standards of various models of hot wire or hot film air flow meters are not completely the same. Taking the Nissan MAXIMA sedan VG30E engine as an example, this article introduces the inspection method of the hot wire air flow meter. The hot wire and hot film air flow meters of other vehicle models can be tested using this method. 1. To test the air flow meter with a multimeter, the measurement method is as follows: (1) Unplug the wiring harness plug of the air flow meter and remove it. Connect the battery voltage to the D and E terminals in the flowmeter socket (note that the power polarity should be correct), and then use a multimeter to measure the voltage between the B and D terminals in the socket. The normal voltage should be 1.6 ± 0.5 V (3). Use a nozzle or electric fan to blow air into the inlet of the air flow meter, and mea

1. Principle of measuring temperature of fluid air

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