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What is a square root extractor?
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Engr. Shafiul Bari
Shafiul Bari is a seasoned Marine Engineer with extensive experience in ship design, maintenance, and marine propulsion systems. With a deep technical knowledge of ship engineering and a passion for advancing maritime technology, Shafiul shares practical insights and expert advice to help marine professionals and enthusiasts better understand the complexities of ship systems. Through his website, he aims to bridge the gap between technical theory and real-world application, fostering a community of informed and skilled maritime engineers.
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The square root extractor is an electronic (or pneumatic) device that takes the square root of the signal from the flow transmitter and outputs a corresponding linear flow signal.
Purpose of its use
The square root extractor is used to convert the measured differential pressure into flow rate. signal is found to vary as the square of the measured flow rate, Q, based on eqn (*) and the basic flow rate equation Q = A (flow area) x V (velocity)
That is, Q2 α ∆P, where Q α √∆P.
Hence, a square root extractor is required on the ∆P signal in order to measure Q.
Why it is not used in level/temperature transmitter.
Because the relationship between the variables are linear so no need of an square root extractor.
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