Storage, transportation, and loading system
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Our company has always used Emerson’s batch controllers DL8000+, mass flow meters, and related equipment to carry out automatic filling； But at that time, there were no specialized programs, nor was there a comprehensive system on the PC for tasks such as loading, generating invoices, and keeping records; after loading, weight measurement was still done using a scale ； A 120-ton scale has an accuracy of 20 KG, while if our Emerson mass flow meters are combined with a complete loading system, the accuracy will be much lower than that value. Looking at other large enterprises, they generally use batch and retail controllers along with mass flow meters as part of the loading system, while scale weights are used only for unloading or during random inspections ； Since my company has never experienced this before, I plan to present this viewpoint to my management. I would appreciate it if experts could point out the advantages and disadvantages; professional articles would be even better. Thank you very much
Loading is loading; the final measurement is based on what is shown on the scale. If it is changed to use a batch controller and a mass flow meter as the external measuring devices, calibration becomes very complicated. It needs to be taken offline for verification every year.
Flow meters are used for dynamic measurement, while load cells are used for static measurement. The DL8000 comes with a matching loading management system; it can be purchased directly from EMERSON, or domestic manufacturers can be approached to develop one； As for the calibration issue mentioned above, the scale also needs to be inspected by a professional every year ； If a dedicated calibration procedure opening is added at the loading station, it is possible to avoid using a flow meter and instead carry out actual flow calibration by connecting a mobile volumetric tank vehicle
Precision and error are two distinct concepts; error refers to the difference between the actual value and the theoretical value； Precision is used for measurement, representing the smallest unit of measurement ； Precision is not proportional to error; for example, a precision of 0.001 may result in an error of either 0.006 or 0.020 ； An error with a precision of 0.01 is at least 0.01. Therefore, without considering the issue of precision, what really needs to be considered is the issue of error. A high-quality mass flow meter will measure several other parameters to provide a basis for its own calibration, and its error is much smaller than that of a scale.