Limitations of differential pressure
Differential pressure is a proven level measurement method, but it does have its drawbacks. For starters, installation requires stopping the process and draining the vessel where the measurement is made. This can be a costly or time-consuming process, especially if there are multiple vessels requiring this type of measurement. Additionally, the impulse lines and capillary lines used in differential pressure measurements are susceptible to outside influences. If these lines are in high traffic areas, they’re at risk of being crushed, and if outside of a climate controlled area, lines can heat up or chill, causing a change in material density and a level measurement error. Fortunately, there is a workaround for these common issues.