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Unformatted text preview: FLOW SENSOR FLOW SENSOR h i t t f t i t d t i ยก 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. ยก A very important sensor in process industry. ยก 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 ยก The basic principle used is to measure the pressure change of fluid flow through an obstruction by using a differential pressure transducer. ยก The flow rate of fluid after the obstruction will increase but the pressure will reduce. The relation between both factors are: here, flow rate ฮ P K q = where, q : flow rate K : constant ฮ P : pressure change Dr. Abdirahman CHAPTER 4 Page 96 of 111 ยก 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 ยก 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. ยก The sensed pressure difference has to be sent to the differential pressure transmitter or โD/P cellโ to change the pressure to proportionate output current signal which is (420 mA)....
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 Fall '07
 Abdirahman
 Fluid Dynamics, Dr. Abdirahman

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