Thermal mass flow meters employ the thermal dispersion principle whereby the rate of the heat absorbed by a fluid flowing in a pipe is directly proportional to its mass flow. In a typical thermal flow meter gas flowing over gas flowing over a source of heat absorbs the heat and cools the source.
As flow increases, more heat is absorbed by the gas. The amount of heat dissipated from the heat source is proportional to the gas mass flow and its thermal properties. Therefore, the measurement of the heat transfer supplies data from which a mass flow rate may be calculated.
Thermal mass flow meter:
Thermal mass flow meters are designed to accurately monitor and measure the mass flow of clean gases, a parameter that is not temperature dependent.
Therefore, the thermal mass flow meter doesn’t require a correction for changes in gas, temperature, pressure, viscosity, and density.
The thermal mass controller is capable of providing direct measurement mass flow, as opposed to most other methods that measure volumetric flow and require separate measurements for temperature and pressure in order to calculate the density, utility and the masses. To purchase this instrument you can get in touch with the thermal mass flow meter suppliers
These thermal flow meter instruments actually measure and control the direct measurement of mass flow, and opposed to most other methods that measure volumetric flow on the molecular level and so are able to provide an extremely accurate, repeatable, and reliable gas into the process.
Thermal flow meter working theory:
Thermal Mass Flow meter works base on Thermal diffusion theory. It measures the mass flow rate by analyzing the thermal exchange between the fluid and thermal source . The two popular methods are using today is:
Tv: Heated sensor as a velocity sensor
Ta: Unheated sensor measuring gas temperature
CHC: Constant heating current
Heat the Tv RTD with consistent current and analyze the temperature difference between Tv and Ta= △T. Flow rate is computed based on the heated velocity sensor and the temperature sensor △T.
CTD: Constant temperature differential
Heat the Tv RTD with changing current, to keep the temperature difference between Tv and Ta consistent. Then analyze the heating current to get the mass flow rate.
The flow rate is computed based on the amount of electrical power added to heat the velocity sensor to maintain this constant value.
Thermal flow meter applications:
Thermal gas flow meter is suitable for a variety of processing requiring mass flow measurement and are frequently used for regulation of low gas flow. But, these instruments comes with some limitation that is mentioned below-
- Gas mass meter use is limited to clean.
- Relatively high initial cost.
- Presence of moisture can decrease the performance of the instrument.
Thermal mass flow meter suppliers:
If you are looking for the thermal mass flow meter suppliers then you can get in touch with us. We offer you highly durable, accurate, and versatile thermal measurement equipment at cost-effective rates. The level of proficiency you will get in our instruments is utmost.
Thermal mass flow meter advantages:
- Measure gas mass flow rate directly.
- Able to measure accurately low gas flow rates or low gas velocities.
- No moving parts.
- Highly accurate, and repeatable measurements with typical accuracy.
- Excellent down ratio, typically 100:1
We hope now you understand the working principle of the thermal mass flow meter. If you are looking for the thermal mass flow meter suppliers, then feel free to contact us. We have a range of thermal mass flow meters that check the heat, and gas flow of the device accurately. We can further customize our flow meter as per the requirements of the customers.
We offer you the thermal mass meter instruments that can easily detect the gas leakage and compressed air flow and distribution. They can also calculate flair gas distribution, monitoring and controlling the gas flow and so forth.