Following are the steps which need to be followed in the process of the flow sensor selection:
- First of all, determine if the flowrate information should be continuous or totalized. Also decide, whether this information is required locally or remotely. In case, remotely needed then establish the type of transmission preferred. Transmission can be analog, digital and shared. If the transmission is shared type then ascertain the minimum needed data-update frequency.
- After finding answers to all the above questions, two main evaluations are done. First evaluation is related to properties and flow characteristics of the process fluid, and another one is of the piping which will accommodate the flowmeter.
- Now, the next step is to decide the essential meter range by identifying minimum and maximum flows (mass or volumetric) to be measured.
- Once this is done, the requisite accuracy of flow measurement is determined.
In general accuracy is specified in
- percentage of actual reading (AR)
- in percentage of calibrated span (CS)
- in percentage of full scale (FS) units
- The accuracy requirements should be discretely stated at minimum, normal, and maximum flowrates. Without judging these requirements, our meter’s performance can not reach the acceptable level over its full range.