Thermal mass Flowmeters are designed to use the thermal properties of the fluid which is being measured. The typical industrial flow meter has two sensors one which is heated and another which remains unheated. This Device is accurately designed to measure the temperature of the fluid. It has a valve that allows the fluid to enter for it to be evaluated by the sensors. The heater sensor receives the heat but as heat increases some are lost in the flowing fluid However, the temperature measurements in the flow sensor take a record of this heat.
The fluid flow is determined by the heat input used by the transmitter and temperature measurements. Thermal dispersion flow meters are usually used in the gas flow because of their reliability and efficiency.
When determining the lost temperature emphasis is laid upon the thermal properties of the fluid and the design of the sensor. These variations can be facilitated by various temperature ranges and pressure changes. Therefore, it is very important to know the composition of the fluid so that proper and accurate measurements can be taken.
In most cases, thermal gas mass flow meter works best in a clean fluid which is free from impurities,such as air flow meter or compressed air flow meter. It is better to take the actual measurement of the fluid without necessarily mixing them up so that you can obtain accurate results. If the actual gas is not pure chances are that you will not get accurate measurements.
It has no moving parts which imply it requires less maintenance
which consequently lowers maintenance costs.
Thermal gas flow meter is also very reliable and accurate for applications that have fluctuating pressure and temperature.
It is highly accurate and it shows some consistency in repeatable measurements.
It has an impressive turndown ratio of 50:1
Thermal dispersion mass flow is good at measuring gases with low gas velocities
It also measures gas mass flow rate directly
From these advantages it is clear that is is a very reliable gas or air flow measuring instrument that requires users to be keen on detail if they want accurate readings. If you are looking for accuracy especially for pure gases then this is a perfect choice. On the other let us have a look at its limitations.
Relatively high initially costs
It is only limited to non -abrasive clean fluids so that it can take accurate measurements.
Inaccuracy can be caused as a result of variation from calibrated values. Therefore, it is vital to know the thermal properties of the fluid.
Perhaps, the flowmeter is very sensitive which requires pure and specific thermal properties. However, this limitation does not apply to automotive engines.
How to use Thermal Flowmeters
It is normally used for clean gases such as nitrogen, ammonia, helium and other pure industrial gases. Other mixtures like biogas can only be measured after determining their respective composition. The good thing is that it is entirely dependent on thermal properties. It can also be used in petrochemical plants so long as the thermal properties of the gas are known. Some corrosive gases such as by sulfide can only be measured after determining its composition properties. This is quite an impressive system for those users who can measure pure gases because you are guaranteed accuracy in the values.
This instrument is very reliable in mass flow measurements. The following are common applications.
Landfill gas recovery
The gas leak testing and detection
Gas flow mixing and blending
Flare gas measurement,flare gas flow meter
Natural gas consumption for boiler feed control and burners,natural gas flow meter
Compressed air flow and distribution.
It is also used in industries such as pulp and paper, metals and mining, water and waste, food and beverage, chemical, power, gas, and oil.
Non-abrasive fluids and those that are capable of coating the sensor can adversely affect the flow measurement. The sensor will have to be regularly cleaned which will increase its maintenance costs. Additionally, if the components vary from the calibrated values it can make the device to be highly inaccurate. It is not suitable for fluid which has varying compositions. Gases with droplets and aerosols also compromise the functionality of thermal flow meter because they require large energy to heat up.
Therefore, when using this device it is important to stick to known specifications so that it can work optimally. Ensure the purity of the fluids is always maintained to avoid inaccuracy. This will help in accurately calculating the mass flow rate. Some industries require precise accuracy so that it can help in the management and monitor of its systems.
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