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Comment Automation & Control

Pressure measurement considerations

By Chemical Engineering |

Pressure measurement in the chemical process industries (CPI) is crucial to many unit operations, and selecting the most effective pressure sensors for a given situation can be complicated by a range of factors. An initial key to selection is establishing an accurate understanding of exactly what is meant when the term “pressure” is used, since there are different types. Other critical considerations include the following: media compatibility, environment, process control, electrical isolation and output signal. Pressure types Pressure measurements can be affected by what type of pressure sensing equipment is used, and understanding the different types of pressure is a prerequisite for selecting sensors or gages for your application. Accuracy can suffer if pressure types are misunderstood. Differences in pressure types have everything to do with the reference point for a given pressure measurement. Here are definitions for five common pressure types: Gage pressure — Gage pressure, the type that most people first imagine when thinking of measuring pressure, covers a positive pressure range. Its zero (reference) point is set at ambient pressure, and it is unaffected by changes in barometric pressure because the sensor…
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