The key indexes and influencing factors of precision gas mass flowmeter
2024-07-12
Precision gas mass flowmeter is a kind of high-precision instrument for measuring gas flow, which plays an important role in many fields such as chemical industry, biomedicine, environmental monitoring and experimental research. The following is a detailed introduction to the precision gas mass flowmeter:
1. How it works
The working principle of precision gas mass flowmeter is mainly based on the law of conservation of mass and the law of thermodynamics. According to the law of conservation of mass, the static mass flow of gas remains constant in a constant cross-section. Therefore, by measuring the mass of the gas passing through the section in a certain time, the mass flow rate of the gas can be calculated. At the same time, according to the laws of thermodynamics, there is a certain relationship between the volume, pressure, temperature and density of a gas, that is, the thermal equation of state. By measuring the volume, temperature, pressure and other parameters of the gas, the density of the gas can be calculated, and then the mass flow rate can be obtained.
In the actual measurement, the precision gas mass flowmeter will use sensors and other devices to measure the relevant parameters of the gas, such as temperature, pressure, speed, etc., and then calculate the mass flow of the gas according to the above principle through the built-in calculator. Common sensor types include thermistors, thermal film sensors, differential pressure sensors, and turbine sensors.
2. Characteristics and advantages
Precision: Precision gas mass flowmeter accuracy can reach ±1%, much higher than other types of gas flowmeters, can provide very accurate gas flow measurement results.
Wide applicability: can measure a variety of gases, including gas, natural gas, liquefied natural gas, etc., suitable for a variety of gas heating process, environmental monitoring and experimental research gas flow measurement.
High stability: Due to the use of advanced sensor technology and calculation methods, precision gas mass flowmeters have high stability and reliability, and can maintain measurement accuracy for a long time.
3. Application field
Chemical field: In the chemical production process, the flow of various gases needs to be precisely controlled to ensure the stability of the production process and product quality. Precision gas mass flowmeters can meet this demand and provide high precision gas flow measurement.
Biomedical field: In the biomedical field, precise control of gas flow is required to ensure the accuracy of experimental results. Precision gas mass flowmeter can provide high precision gas flow measurement to meet the needs of biomedical experiments.
Environmental monitoring: In environmental monitoring, it is necessary to accurately measure gas flow such as exhaust gas from coal-fired power plants and exhaust gas emissions from waste gas treatment equipment. Precision gas mass flowmeters can provide accurate measurement results, providing strong support for environmental monitoring.
Four, the key indicators of precision gas mass flowmeters and their influencing factors can be summarized as follows:
Key indicator
Measuring range:
The measuring range refers to the range between the maximum flow rate and the minimum flow rate that the flowmeter can measure. Choosing the right measuring range is one of the key factors to ensure that the flowmeter can accurately measure the required flow rate.
Accuracy level:
The accuracy class refers to the accuracy of the measured value of the flowmeter, usually expressed as a percentage. The higher the accuracy level, the more accurate the measurement results of the flowmeter. When choosing the accuracy level, it is necessary to make a trade-off according to actual needs and budget, while taking into account factors such as the repeatability and stability of the flowmeter.
Medium temperature:
Medium temperature refers to the temperature range of the fluid being measured. Selecting the appropriate medium temperature is one of the key factors to ensure that the flowmeter will not be damaged or affect the measurement accuracy due to overheating or undercooling under normal working conditions.
Medium pressure:
Medium pressure refers to the pressure range of the measured flow body. Selecting the appropriate medium pressure is one of the key factors to ensure that the flow meter will not be damaged or affect the measurement accuracy due to overpressure or underpressure in the normal working state.
Response time:
Response time refers to the response speed of the flowmeter to the change of the flow being measured. Choosing the appropriate response time is one of the key factors to ensure that the flowmeter can quickly and accurately track the changes of the measured flow body.
Output signal:
The output signal refers to the type and range of electrical signals output by the flowmeter. Choosing the right output signal is one of the key factors to ensure that the flow meter can communicate reliably with the control system or other instruments.
Explosion-proof grade:
For some explosive and flammable media, it is necessary to choose a flowmeter with a higher explosion-proof level to ensure the safety of the measurement process.
Influencing factor
Pipeline design:
The diameter of the pipeline will directly affect the flow rate and distribution of gas, thus affecting the measurement accuracy of the flowmeter. Proper piping design is an important factor in ensuring measurement accuracy.
Measuring medium:
Different gas media have different physical states and thermal properties, such as relative humidity, pressure, temperature and viscosity, which will affect the accuracy of gas flow measurement. Therefore, during the measurement process, it is necessary to maintain a stable state of the gas medium.
Temperature effect:
The change of gas temperature will affect the density and volume of the gas, which will affect the measurement accuracy of the flowmeter. During use, changes in ambient temperature need to be considered, and temperature compensation may be required for the flowmeter.
Pressure effect:
The change in gas pressure also affects the physical properties of the gas, such as density and viscosity, which in turn affects the measurement accuracy of the flowmeter. Therefore, the pressure of the gas needs to be adjusted according to the actual situation.
Instrument calibration:
The accuracy of flowmeters depends on how well they are calibrated. Before installation and during operation, the flow meter needs to be calibrated periodically to ensure the accuracy of its measurement results.
Impurities and moisture in gases:
Impurities and moisture in the gas may affect the measurement accuracy of the flowmeter. For example, impurities can make the probe of the flow meter stick, reducing the sensitivity of the sensor; The moisture may form condensate, covering the sensor surface and affecting the stability of the measurement data.
In summary, the key indicators of precision gas mass flowmeters include measurement range, accuracy level, medium temperature, medium pressure, response time, output signal and explosion-proof level. At the same time, its measurement accuracy is affected by many factors such as pipeline design, measurement medium, temperature effect, pressure effect, instrument calibration, and impurities and moisture in the gas. In the process of use, these factors need to be considered comprehensively to ensure the accuracy and reliability of the measurement results.
If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.
1. How it works
The working principle of precision gas mass flowmeter is mainly based on the law of conservation of mass and the law of thermodynamics. According to the law of conservation of mass, the static mass flow of gas remains constant in a constant cross-section. Therefore, by measuring the mass of the gas passing through the section in a certain time, the mass flow rate of the gas can be calculated. At the same time, according to the laws of thermodynamics, there is a certain relationship between the volume, pressure, temperature and density of a gas, that is, the thermal equation of state. By measuring the volume, temperature, pressure and other parameters of the gas, the density of the gas can be calculated, and then the mass flow rate can be obtained.
In the actual measurement, the precision gas mass flowmeter will use sensors and other devices to measure the relevant parameters of the gas, such as temperature, pressure, speed, etc., and then calculate the mass flow of the gas according to the above principle through the built-in calculator. Common sensor types include thermistors, thermal film sensors, differential pressure sensors, and turbine sensors.
2. Characteristics and advantages
Precision: Precision gas mass flowmeter accuracy can reach ±1%, much higher than other types of gas flowmeters, can provide very accurate gas flow measurement results.
Wide applicability: can measure a variety of gases, including gas, natural gas, liquefied natural gas, etc., suitable for a variety of gas heating process, environmental monitoring and experimental research gas flow measurement.
High stability: Due to the use of advanced sensor technology and calculation methods, precision gas mass flowmeters have high stability and reliability, and can maintain measurement accuracy for a long time.
3. Application field
Chemical field: In the chemical production process, the flow of various gases needs to be precisely controlled to ensure the stability of the production process and product quality. Precision gas mass flowmeters can meet this demand and provide high precision gas flow measurement.
Biomedical field: In the biomedical field, precise control of gas flow is required to ensure the accuracy of experimental results. Precision gas mass flowmeter can provide high precision gas flow measurement to meet the needs of biomedical experiments.
Environmental monitoring: In environmental monitoring, it is necessary to accurately measure gas flow such as exhaust gas from coal-fired power plants and exhaust gas emissions from waste gas treatment equipment. Precision gas mass flowmeters can provide accurate measurement results, providing strong support for environmental monitoring.
Four, the key indicators of precision gas mass flowmeters and their influencing factors can be summarized as follows:
Key indicator
Measuring range:
The measuring range refers to the range between the maximum flow rate and the minimum flow rate that the flowmeter can measure. Choosing the right measuring range is one of the key factors to ensure that the flowmeter can accurately measure the required flow rate.
Accuracy level:
The accuracy class refers to the accuracy of the measured value of the flowmeter, usually expressed as a percentage. The higher the accuracy level, the more accurate the measurement results of the flowmeter. When choosing the accuracy level, it is necessary to make a trade-off according to actual needs and budget, while taking into account factors such as the repeatability and stability of the flowmeter.
Medium temperature:
Medium temperature refers to the temperature range of the fluid being measured. Selecting the appropriate medium temperature is one of the key factors to ensure that the flowmeter will not be damaged or affect the measurement accuracy due to overheating or undercooling under normal working conditions.
Medium pressure:
Medium pressure refers to the pressure range of the measured flow body. Selecting the appropriate medium pressure is one of the key factors to ensure that the flow meter will not be damaged or affect the measurement accuracy due to overpressure or underpressure in the normal working state.
Response time:
Response time refers to the response speed of the flowmeter to the change of the flow being measured. Choosing the appropriate response time is one of the key factors to ensure that the flowmeter can quickly and accurately track the changes of the measured flow body.
Output signal:
The output signal refers to the type and range of electrical signals output by the flowmeter. Choosing the right output signal is one of the key factors to ensure that the flow meter can communicate reliably with the control system or other instruments.
Explosion-proof grade:
For some explosive and flammable media, it is necessary to choose a flowmeter with a higher explosion-proof level to ensure the safety of the measurement process.
Influencing factor
Pipeline design:
The diameter of the pipeline will directly affect the flow rate and distribution of gas, thus affecting the measurement accuracy of the flowmeter. Proper piping design is an important factor in ensuring measurement accuracy.
Measuring medium:
Different gas media have different physical states and thermal properties, such as relative humidity, pressure, temperature and viscosity, which will affect the accuracy of gas flow measurement. Therefore, during the measurement process, it is necessary to maintain a stable state of the gas medium.
Temperature effect:
The change of gas temperature will affect the density and volume of the gas, which will affect the measurement accuracy of the flowmeter. During use, changes in ambient temperature need to be considered, and temperature compensation may be required for the flowmeter.
Pressure effect:
The change in gas pressure also affects the physical properties of the gas, such as density and viscosity, which in turn affects the measurement accuracy of the flowmeter. Therefore, the pressure of the gas needs to be adjusted according to the actual situation.
Instrument calibration:
The accuracy of flowmeters depends on how well they are calibrated. Before installation and during operation, the flow meter needs to be calibrated periodically to ensure the accuracy of its measurement results.
Impurities and moisture in gases:
Impurities and moisture in the gas may affect the measurement accuracy of the flowmeter. For example, impurities can make the probe of the flow meter stick, reducing the sensitivity of the sensor; The moisture may form condensate, covering the sensor surface and affecting the stability of the measurement data.
In summary, the key indicators of precision gas mass flowmeters include measurement range, accuracy level, medium temperature, medium pressure, response time, output signal and explosion-proof level. At the same time, its measurement accuracy is affected by many factors such as pipeline design, measurement medium, temperature effect, pressure effect, instrument calibration, and impurities and moisture in the gas. In the process of use, these factors need to be considered comprehensively to ensure the accuracy and reliability of the measurement results.
If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.
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