Voices: Plant InSites

Grasp the Nuances of Level Measurement

The differences in the way devices work can profoundly affect readings

By Andrew Sloley, Contributing Editor
Aug 24, 2018

To truly understand what your process is doing, you must understand how you are measuring its performance. Process instruments provide readings on a variety of physical characteristics, including integer measurements (e.g., batches run, items made, bales processed), continuous measurements (e.g., temperature, pressure, flow, level) and discrete measurements (e.g., weight of product in a container). In all cases, the accuracy of the measurement depends upon the device used. Potential production and safety problems from inaccurate measurements and how the device responds to unusual process events also varies with the type of instrument. To illustrate these points, let’s look at three common methods for measuring liquid level: differential pressure devices, displacers and floats.

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