To review --- the performance of a level measurement system is quantified by means of its accuracy statements. The reader must understand not only which parameter is being described, but also the manner in which the statement is expressed. In level measurement, parameters are commonly described in terms of a(n): absolute (fixed) distance error percentage of the empty distance … [Read more...] about Level Gauge Performance (Part 3 of 3)
A percentage of measured distance statement describes a parameter that is in error by a constant percentage of the actual distance measurement. In the measurement of a 1000 mm high vessel (100% level located 100 mm below the sensor) measured with an accuracy of 1 percent of measured distance, the absolute error can be calculated as: An absolute (fixed) distance error statement … [Read more...] about Level Gauge Performance (Part 2 of 3)
The purpose of installing a level measurement system is to measure level accurately in a reliable manner. Whereas issues dealing with physical properties, process parameters, electronic features, and interconnections are often considered extensively, the quantification of the expected measurement quality of the installed level measurement system can be virtually neglected. … [Read more...] about Level Gauge Performance (Part 1 of 3)
Many of my articles focus on performance statements for flowmeters. It is interesting how another twist can come along just when the subject seems to be getting "old". Whereas reference flowmeter performance can generally be expressed as one of four parameters, reference level gauge performance is generally expressed as one of six parameters. This was not so bad. Even more … [Read more...] about Can You Believe Performance Statements For Level Gauges?