Principle of Thermal Gas Mass Flow Meter
sales01@cxflowmeter.com
Gas thermal flow meter can also be called
thermal gas mass flow meter, which is a new type of measuring instrument. The main component of the gas thermal flowmeter is the probe, because of its stable technical performance, the gas thermal flowmeter can also measure well in some harsh environments.
Let me briefly talk about the working principle of gas thermal flow meter. The working principle of the gas thermal flowmeter is that when the flow sensor measures the medium, the temperature of the medium flows through the flow sensor, and then it is calculated by heat transfer.
Flow meters/flow switches are flow meters based on the principle of thermal diffusion. That is, when the fluid flows through the heating object, the heat dissipation of the heating object is proportional to the flow rate of the fluid. Specifically, the sensor of the flowmeter has two standard RTDs, one is used as a heat source and the other is used to measure the fluid temperature. When the fluid flows, the temperature difference between the two is nonlinear with the flow rate. relationship, the instrument can convert this relationship into a linear output of the measured flow signal.
There are two design methods for flow meters manufactured by the principle of thermal diffusion: one is based on the principle of constant temperature difference; the other is based on the principle of constant power. Based on a common data model: P/△T=A B(Q)N. Among them: P---dissipated power, △T---temperature difference between two sensors, Q---mass flow rate, N---exponential coefficient, A and B are coefficients related to the thermal properties of the gas.
The principle of constant temperature difference: △T remains unchanged, and the dissipated power P and the flow rate Q of the fluid increase exponentially.
The principle of constant power: the dissipated power remains unchanged, and the temperature difference ΔT and the flow rate Q of the fluid decrease exponentially.
sales01@cxflowmeter.com
