Pressure-Based Level Measurements Keep Getting Better and Better

While Radar and Ultrasonics Are Getting Most of the Attention, Automation Vendors Are Quietly Improving Their Pressure-Based Level Measurement Instrumentation

By Paul Miller

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“Reliable measurements enable our plant to operate within limits, improving the safety and reliability of the plant, while maximizing profit,” says Greg Breaux, instrumentation specialist at the Motiva Enterprises Norco Refinery, located just outside New Orleans.

“DP [differential pressure] technology is perhaps the most simple and reliable technology for measuring level as well as flow. It is usually the right technology in applications where the specific gravity of the process does not change more than the desired accuracy of the measurement,” said Breaux. “DP technology is simple to understand, and simple to design and install. The basic technology has been around so long that everyone understands it, even when you add the new advancements, such as remote seal diaphragms, Foundation Fieldbus, etc.”

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