Rotameter Different Gas Conversion
2024-07-10
When the rotameter measures different gases, due to the different physical properties of the gas (such as density, pressure, temperature, etc.), it is necessary to carry out the corresponding conversion to get the accurate flow value. The following is a specific description of the conversion of different gases of the rotameter:
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Conversion principle
In the conversion of gas rotameter, it mainly involves the adjustment of gas density, pressure, temperature and other parameters. Usually, the actual measured flow value needs to be converted to a flow value in a standard state (such as standard cubic meters per hour, Nm³/h) for comparison and calculation.
Conversion formula
Conversion formulas are usually based on the gas equation of state and the principles of fluid mechanics, and one commonly used conversion formula is as follows:
Q1 = Q2 × SQR((p2 × T1) / (p1 × T2)) × SQR(B1 / B2)
Q1: The actual flow rate under working condition is converted to the flow rate under standard condition (Nm³/h)
Q2: The actual flow rate under the inspection state is converted to the flow rate under the standard state (Nm³/h).
p1: Absolute pressure under test (usually one atmosphere, i.e. 10333mmH2O)
p2: Absolute pressure under working condition (mmH2O)
T1: Absolute temperature under test (usually 293K)
T2: Absolute operating temperature (K)
B1: Test medium density under standard state (kg/Nm³, generally air density)
B2: Density of measured medium under standard state (kg/Nm³)
SQR: indicates the square root
Conversion procedure
Determine the parameters: First, it is necessary to determine the parameters of gas pressure, temperature and density under the working state and the inspection state.
Substitute the above parameters into the conversion formula to calculate the value of Q1.
Result verification: The conversion results are verified to ensure the accuracy and reliability of the calculation.
Matters needing attention
Unit consistency: When converting, ensure that the units of all parameters are consistent, otherwise it will affect the accuracy of the calculation results.
Parameter selection: To choose the appropriate conversion formula and method to ensure the reliability and efficiency of the calculation.
Result verification: To verify the conversion results, compare the calculated flow rate and the actual measured flow rate is consistent.
Common gas measurement range and accuracy
Air: The measurement range can reach 0.04 ~ 120m/s, the measurement accuracy is generally ±1 ~ 3%.
Oxygen: The measurement range is generally 0.3 ~ 200m/s, and the measurement accuracy is also high.
Nitrogen: The measurement range is generally 0.1 ~ 60m/s, and the measurement accuracy is relatively high.
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.
In the conversion of gas rotameter, it mainly involves the adjustment of gas density, pressure, temperature and other parameters. Usually, the actual measured flow value needs to be converted to a flow value in a standard state (such as standard cubic meters per hour, Nm³/h) for comparison and calculation.
Conversion formula
Conversion formulas are usually based on the gas equation of state and the principles of fluid mechanics, and one commonly used conversion formula is as follows:
Q1 = Q2 × SQR((p2 × T1) / (p1 × T2)) × SQR(B1 / B2)
Q1: The actual flow rate under working condition is converted to the flow rate under standard condition (Nm³/h)
Q2: The actual flow rate under the inspection state is converted to the flow rate under the standard state (Nm³/h).
p1: Absolute pressure under test (usually one atmosphere, i.e. 10333mmH2O)
p2: Absolute pressure under working condition (mmH2O)
T1: Absolute temperature under test (usually 293K)
T2: Absolute operating temperature (K)
B1: Test medium density under standard state (kg/Nm³, generally air density)
B2: Density of measured medium under standard state (kg/Nm³)
SQR: indicates the square root
Conversion procedure
Determine the parameters: First, it is necessary to determine the parameters of gas pressure, temperature and density under the working state and the inspection state.
Substitute the above parameters into the conversion formula to calculate the value of Q1.
Result verification: The conversion results are verified to ensure the accuracy and reliability of the calculation.
Matters needing attention
Unit consistency: When converting, ensure that the units of all parameters are consistent, otherwise it will affect the accuracy of the calculation results.
Parameter selection: To choose the appropriate conversion formula and method to ensure the reliability and efficiency of the calculation.
Result verification: To verify the conversion results, compare the calculated flow rate and the actual measured flow rate is consistent.
Common gas measurement range and accuracy
Air: The measurement range can reach 0.04 ~ 120m/s, the measurement accuracy is generally ±1 ~ 3%.
Oxygen: The measurement range is generally 0.3 ~ 200m/s, and the measurement accuracy is also high.
Nitrogen: The measurement range is generally 0.1 ~ 60m/s, and the measurement accuracy is relatively high.
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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