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Unformatted text preview: FLOW SENSOR FLOW SENSOR h i t t f t i t d t i ¡ The important factor is to determine the flow rate of a fluid or the total flow of fluid that flows through a point at a certain time. ¡ A very important sensor in process industry. ¡ Consists of many types: i. Differential pressure flow meter. ii. Turbine flow meter. i agnetic flow meter Dr. Abdirahman CHAPTER 4 Page 95 of 111 iii. Magnetic flow meter. . DIFFERENTIAL PRESSURE FLOW . DIFFERENTIAL PRESSURE FLOW 1. DIFFERENTIAL PRESSURE FLOW 1. DIFFERENTIAL PRESSURE FLOW METER METER ¡ The basic principle used is to measure the pressure change of fluid flow through an obstruction by using a differential pressure transducer. ¡ The flow rate of fluid after the obstruction will increase but the pressure will reduce. The relation between both factors are: here, flow rate Δ P K q = where, q : flow rate K : constant Δ P : pressure change Dr. Abdirahman CHAPTER 4 Page 96 of 111 ¡ This meter is popular because there are no moving parts. Therefore this meter is reliable and easy to maintain. he disadvantage of this meter is the obstruction ¡ The disadvantage of this meter is the obstruction used will cause constant pressure loss and a pump has to be used to increase the pressure. Therefore e pattern of pressure change in the pipe needs to the pattern of pressure change in the pipe needs to be known. ¡ The sensed pressure difference has to be sent to the differential pressure transmitter or “D/P cell” to change the pressure to proportionate output current signal which is (420 mA)....
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This note was uploaded on 05/09/2010 for the course CHE 3022 taught by Professor Abdirahman during the Fall '07 term at National Central University.
 Fall '07
 Abdirahman

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