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Pertemuan 8 Sistem pengukuran zat alir

Pertemuan 8 Sistem pengukuran zat alir. Matakuliah : H0262 / Pengukuran dan Instrumentasi Tahun : 2005 Versi : 00 / 01. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Mahasiswa dapat menjelaskan sistem pengukuran zat alir. Outline Materi.

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Pertemuan 8 Sistem pengukuran zat alir

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  1. Pertemuan 8Sistem pengukuran zat alir Matakuliah : H0262 / Pengukuran dan Instrumentasi Tahun : 2005 Versi : 00 / 01

  2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • Mahasiswa dapat menjelaskan sistem pengukuran zat alir

  3. Outline Materi • Materi 1 : Pengukuran kecepatan • Materi 2 : Pengukuran volume aliran • Materi 3 : Sistem flowmeter dan karakteristik • Materi 4 : Turbin flowmeter • Materi 5 : Vortex flowmeter • Materi 6 : Vortex flowmeter • Materi 7 : Electromagnetic flowmeter • Materi 8 : Doppler flowmeter

  4. SISTEM PENGUKURAN ZAT ALIR Pengukuran kecepatan . 2 ( 1 - S ) v =    P S 2  -1/  V= { [ (1+ ) -1 ] }  -1 PS  = ratio dari spesifik panas pada temperatur konstan

  5. Gb 8.1 Pitotstatic tube.

  6. Pengukuran volume aliran. • Asumsi pada perhitungan teoritis : • frictionless rendah • tidak ada panas yang hilang • conservation total energy E1 = P1 / 1 + ½ V12 + gz! E 2 = P2 /2 + ½ V22 + gz2

  7. 4. Incompressible fluid 1 = 2=  . 5. Horisontal pipe . z1 = z2 ½ ( V22 – V12 ) = 1/P ( P1 – P2) … modifikasi persamaan 3

  8. 6. Conservation volume aliran Q1 = Q 2 = Q dimana Q1 = A 1 v 1 Q2 = A 2 v 2 A2 QTH =  [ 2(P1-P2) /] [1- ( A2/A1)2] QACT = CD E A  [ 2 (P1 – P2) /  ]

  9. CD = koefisien discharge E = kecepatan m= ratio aliran : d2 / D 2 A = aliran area cross section =  d2 /4 .

  10. Sistem Flowmeter dan karakteristik . • no moving parts • permanent pressure loss • device non linear • clean fluid • typical Flowmeter terdiri dari differential pressure sensing elemen. • considerable . Tabel 8.1.

  11. Varaiabel area Flowmeter. Q = CD A2(x)  [2(P1-P2) / ] A2(x) =1/4  ( D2-d2) P1-P2 = t (  - ) g Q 2 CD d tan [ t(-)g/ ]x

  12. Varaiabel area Flowmeter. Gb 8.2 variabel area Flowmeter.

  13. Turbin Flowmeter. Gb 8.3 Turbin Flowmeter. E = bmk Q sin (mkQt) .

  14. Vortex Flowmeter. Gb 8.4 Vortex Flowmeter.

  15. Vortex Flowmeter. f 1 4S = Q  D3 d/D [ 1-4hd/D ]

  16. Vortex system detection : • capacitance diafragma • thermal sensor • strain gauge • ultrasonik • Measurement flowrate pada situasi sulit. • Flow laminar atau transitional ( Re < 104 ). • Fluid high korosive atau toxid. • dirty fluid.

  17. Electromagnetic Flowmeter. Gb 8.5 Elektromagnet flowmeter.

  18. Electromagnetic Flowmeter. E = 4BQ / D dan I= 4kQ/kFD.

  19. Doppler Flowmeter. Gb8.6 Doppler flowmeter.

  20. Doppler Flowmeter. 1 R () = lim 0T X(t-)y(t) dt T T Sin wc( -) R() = R( -) = A (-) dimana R ( ) akan max pada saat  =  dan >> 2 / wc atau  >> 1/fC.

  21. << CLOSING>>

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