The flowmeter is nothing but an instrument that is able to measure linear as well as non-linear and mass flow rate of gases or liquids. When it concerns selecting a proper flowmeter you would at the very outset need to understand the type of application that it is being used for, and so it pays to invest your time and make a concerted effort in making a complete evaluation of the processed fluid's nature and how the meter is to be installed.

You need to answers the following questions before choosing your flowmeter. What is the nature of the fluid being measured? Are you going to measure air, water or some of substance? When using the flowmeter you need to determine whether there is need for rate measurement or totalization? Is the fluid being measured clean or not, also has to be determined?

Local Display or Electronic Signals

Other questions that need to be answered with regard to selecting a flowmeter are determining whether a local display is required on the instrument or are electronic signals enough. In addition, you need to establish the minimum as well as maximum rate of flow, minimum and maximum process pressure as well as minimum and maximum temperature of the process.

In addition, determine whether the fluid is chemically compatible with wetted parts of the flowmeter and find out what size pipe should be used in case the application is process oriented. Lastly, you will also need to be concerned with the piping as well as area where the flowmeter can best be located.

Comparing it in terms of performance with a point sensor that to can provide similar performance is another aspect to deciding on using a flowmeter. As a rule of thumb, given that you need to choose between point sensors and flowmeters, the latter is the better option because the former cannot look to the complete flow and it is also only effective when inserted to a certain depth where flow velocity is neither too high nor too low.

So, before you specify your flow meter, it is recommended to check whether to use mass units or volumetric units to obtain the most useful flow information. In the case of compressible materials that do not have constant density, volumetric flow is not very useful. In such cases, it may be better to use mass flow meters that are insensitive to density and pressure as well as variations in viscosity