How to correctly understand the working principle of thermal gas mass flowmeter

How to correctly understand the working principle of thermal gas mass flowmeter Thermal gas mass flowmeter is being recognized and used by more and more users due to its excellent characteristics, and has been applied in many gas flow measurement occasions. However, there are many problems and misunderstandings in these applications. Many manufacturers' irresponsible misleading propaganda and product quality defects have caused many obstacles and blind spots in the use of products, causing many users to misunderstand thermal gas mass flowmeters. Some blindly think that thermal flowmeters can measure gases under all working conditions, while others reject and oppose thermal flowmeters. The origin of the thermal gas mass flowmeter comes from the hot wire anemometer. The temperature of the platinum heating wire has a proportional relationship with the change of the fluid flow rate: the faster the flow rate, the more heat is taken away. The following briefly explains why the mass flow rate of gas can be obtained by detecting the change of heat. Formula: H=m×Cp×ΔT Measured heat H, while fixing the temperature difference ΔT, for a gas with a fixed specific heat capacity Cp, the mass flow rate m of the gas can be directly obtained. Next, we will explain from the microcosm why it is the direct mass flow measurement of gas. Gas molecules contact with the heating wall to complete heat conduction and take away the heat on the probe. Since the ability of different gas molecules to take away heat is different, if the thermal conductivity of gas molecules is known (the Cp value is known), the number of gas molecules flowing through can be directly obtained by measuring the dissipated electric power (the number of gas molecules is also is the mass number), so as to obtain the mass flow rate of the gas. We use the formula: H=m×Cp×ΔT transformation, you can get: m=H/Cp×ΔT Among them: m is the gas mass flow rate, H is the compensated electric power, Cp is the specific heat capacity at constant pressure, which is related to the gas type, and ΔT is the temperature difference between the two probes. From the above formula, two thermal principles can be derived: keep the denominator temperature difference constant The mass flow rate of the gas is obtained by measuring the amount of heat H taken away by the gas in real time. This is the mainstream constant temperature differential heat type in the market. If the heat H of the molecule is kept constant, and the temperature difference is measured in real time to obtain the gas mass flow rate, it is the constant power thermal formula. The principle of constant temperature difference has very good low flow characteristics, even if the mass flow rate is as low as 0.1Nm/s, it has good linearity. In addition, it has the ability to respond quickly. The principle of constant power can detect higher flow rate changes, and has very good performance in high flow rate applications, but the low flow rate characteristics are not as good as the constant temperature difference, and secondly, the response time is relatively poor compared to the constant temperature difference.

Maintaining v shape coriolis mass flow meter is not as easy as it may seem. You have to do plenty of important tasks. So cruel is the truth unless you've got a to help you.

Beijing Sincerity Automatic Equipment Co., Ltd is the major mass flow meter provider. endress hauser ultrasonic flow meter businesses need the right tools at their disposal in order to handle fork density meter manufacturer. Sincerity Mass Flow Meter Manufacturers is your best choice.

Choose the right platform for selling mass flow meter and we'll reach the right customers. But if we have the right idea in the wrong platform, that still adds up to the wrong idea.