A basic question regarding the selection of flowmeters

The unit for vortex flow meters is m3/h, which is the unit under operating conditions; for rotameters, it is air in Nm3/h (under standard conditions), which is the unit under standard conditions

I’m choosing the diameter now; I know the flow rate under standard conditions, but I’m not sure whether it’s necessary to adjust for different operating conditions

Generally, the selection of vortex flowmeters and rotameters requires calculations to be performed using specialized software. Such data tables can generally only be used as a reference; however, for actual operating conditions and the medium involved, it is best to use specialized software provided by the manufacturer for calculations, or to provide the data to the manufacturer so that they can carry out the calculations for you.

I’m choosing the diameter now; I know the flow rate under standard conditions, but I’m not sure whether it’s necessary to adjust for different operating conditions

I’m choosing the diameter now; I know the flow rate under standard conditions, but I’m not sure whether it’s necessary to adjust for different operating conditions

I’m choosing the diameter now; I know the flow rate under standard conditions, but I’m not sure whether it’s necessary to adjust for different operating conditions

There is no need to change operating conditions; providing more detailed data from the instrument specification sheet will suffice for the manufacturer.

It depends on whether you choose it yourself or the manufacturer does. You need to select the model yourself (for gas flow meters). The standard-condition flow rate of the medium must be calculated based on the medium’s operating pressure and temperature as well as its density (or composition), and converted into the flow rate under actual operating conditions. Once this value is known, you can choose the appropriate model from the table showing the measurement range of the flow meter for those operating conditions ； If it is the manufacturer who makes the selection, you need to provide them with the data mentioned earlier (the calculation methods are actually the same; it’s just that the manufacturer carries out the calculations). Of course, this refers to the selection of flowmeter models. When it comes to choosing the type of flowmeter, you need to take into account the properties of the medium, such as its viscosity, the presence of impurities, and whether the instantaneous flow rate fluctuates (in terms of range and amplitude), etc. Then, make a reasonable choice by considering the characteristics of different types of flowmeters.

It depends on whether you choose it yourself or the manufacturer does. You need to select the model yourself (for gas flow meters). The standard-condition flow rate of the medium must be calculated based on the medium’s operating pressure and temperature as well as its density (or composition), and converted into the flow rate under actual operating conditions. Once this value is known, you can choose the appropriate model from the table showing the measurement range of the flow meter for those operating conditions ； If it is the manufacturer who makes the selection, you need to provide them with the data mentioned earlier (the calculation methods are actually the same; it’s just that the manufacturer carries out the calculations). Of course, this refers to the selection of flowmeter models. When it comes to choosing the type of flowmeter, you need to take into account the properties of the medium, such as its viscosity, the presence of impurities, and whether the instantaneous flow rate fluctuates (in terms of range and amplitude), etc. Then, make a reasonable choice by considering the characteristics of different types of flowmeters.