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AI - Ultrasonic Flowmeter Project

The OcARI Gen-AI Ultrasonic Flowmeter. »


وَلَوْ اَنَّ مَا فِى الْاَرْضِ مِنْ شَجَرَةٍ اَقْلَامٌ وَّالْبَحْرُ يَمُدُّهٗ مِنْۢ بَعْدِهٖ سَبْعَةُ اَبْحُرٍ مَّا نَفِدَتْ كَلِمٰتُ اللّٰهِۗ اِنَّ اللّٰهَ عَزِيْزٌ حَكِيْمٌ ۝٢٧

Seandainya pohon-pohon di bumi menjadi pena dan lautan (menjadi tinta) ditambah tujuh lautan lagi setelah (kering)-nya, niscaya tidak akan pernah habis kalimatullah (ditulis dengannya). Sesungguhnya Allah Mahaperkasa lagi Mahabijaksana. (QS. Luqman: 27).



Ultrasonic Flowmeter [UF]

1. Konsep UF

Ultrasonic flowmeter adalah perangkat yang mengukur kecepatan fluida (cairan atau gas) di dalam pipa menggunakan teknologi ultrasonik. Berbeda dengan alat ukur aliran mekanis konvensional, perangkat ini tidak memiliki bagian yang bergerak, sehingga meminimalkan kebutuhan perawatan dan mencegah terjadinya penurunan tekanan dalam sistem.

Teknologi ini banyak digunakan di berbagai sektor industri, seperti pengelolaan air, minyak dan gas, pengolahan kimia, serta sistem HVAC [Heating, Ventilation, and Air Conditioning].


2. Cara Kerja

Alat ukur laju aliran ultrasonik pada dasarnya menggunakan dua metode berbeda untuk menghitung laju aliran fluida.

Pemasangan metode Z Metode pemasangan Z umum digunakan pada pipa dengan diameter lebih dari 100 mm, juga dikenal sebagai metode langsung.

Pemasangan Metode V (V-method atau reflective mode) Metode V lebih umum digunakan untuk pemasangan sensor. Umumnya direkomendasikan untuk digunakan pada pipa dengan diameter 20~300 mm, juga dikenal sebagai metode reflektif. Pengukuran kecepatan aliran fluida dalam pipa menggunakan metode V (V-method atau reflective mode) pada ultrasonic flow meter dilakukan dengan memanfaatkan selisih waktu rambat (transit-time) gelombang ultrasonik yang dipantulkan sekali di dinding pipa.

Prinsip Kerja dan Rumus Dasar

Dua transduser dipasang di sisi yang sama pada permukaan pipa dan membentuk lintasan suara menyerupai huruf "V". Gelombang dikirim searah aliran (tab) dan berlawanan arah aliran (tba).

Rumus umum untuk menghitung kecepatan rata-rata aliran fluida (v) adalah.

v = (L ⁄ (2 · D · tan(θ)) · (Δt ⁄ (tab · tba))

Atau disederhanakan berdasarkan geometri lintasan suara dan sudut datang:

v = (L ⁄ (2 · cos(θ)) · ((tba - tab)) ⁄ (tab · tba))

v = Kecepatan rata-rata aliran fluida (m/s).

L = Panjang lintasan akustik gelombang ultrasonik (m).

θ Sudut antara jalur suara dan sumbu/arah aliran pipa.

tab Waktu tempuh sinyal searah aliran (downstream).

tba Waktu tempuh sinyal berlawanan arah aliran (upstream).

Δt Selisih waktu rambat (tba - tab).

Langkah Penghitungan & Pengaturan Alat

Input Parameter Pipa: Input Parameter Pipa:.

Jarak Antar Transduser: Alat akan otomatis menghitung jarak pasang (sensor spacing) yang tepat untuk metode V..

Dua transduser dipasang di sisi yang sama pada permukaan pipa dan membentuk lintasan suara menyerupai huruf "V". Gelombang dikirim searah aliran (tab) dan berlawanan arah aliran (tba).

2.1. Transit-Time Method

Transit-time meters measure the time difference (Δt) between upstream and downstream ultrasonic pulses traveling across a known path length (L) at angle θ. Flow velocity (V) is derived from Δt, L, and sound speed (c) in the fluid: V = (c² × Δt) / (2L cos θ). This is the dominant method for custody transfer and energy billing applications—and where ROI calculations matter most.

1. The Process. Two transducers send sound waves back and forth across the pipe, one upstream and one downstream.

2. The Principle. Sound traveling with the fluid flow moves faster than sound traveling against it. The meter measures this microscopic time difference to calculate velocity.

3. Best For. Clean, clear liquids (e.g., clean water, oils, chemicals) with minimal bubbles or suspended solids.

2.2. Doppler Effect Method

Doppler meters rely on frequency shift (Δf) of reflected waves from suspended particles: V = (c × Δf) / (2f₀ cos θ), where f₀ is the transmitted frequency. Accuracy degrades rapidly below 100 ppm particle concentration—and introduces ±12% uncertainty in water treatment plants with seasonal turbidity shifts.

1. The Process. A transducer projects an ultrasonic beam into the fluid at a known angle.

2. The Principle. The sound wave reflects off particles or aerated bubbles moving with the fluid, shifting the sound frequency. The meter measures this frequency shift to calculate velocity.

3. Best For. Dirty, slurry, or aerated liquids (e.g., wastewater, sewage, crude oil).

3. Key Design Configurations

Depending on your installation constraints and budget, you can choose between two main structural types:.

Clamp-On (Non-Invasive):

Transducers strap directly onto the outside of the pipe.

Zero downtime required for installation.

Ideal for retrofitting existing systems and preventing contamination.

Inline (Invasive / Spool-Piece):

The meter is built into a pipe section and spliced directly into the pipeline.

It provides higher accuracy because sensor geometry is factory-calibrated.

It Requires shutting down the pipeline for initial installation.

4. Major Advantages & Limitations

Depending on your installation constraints and budget, you can choose between two main structural types:.

Benefits:

No Moving Parts Reduces wear, tear, and long-term maintenance costs.

Obstructionless Design Causes zero pressure drops or energy loss in the pipeline.

Bi-Directional Capable of measuring flow in both forward and reverse directions.

Chemical Compatibility Clamp-on models never touch aggressive or corrosive process fluids.

Trade-offs:

Pipe Wall Dependency Thick, corroded, or lined pipes can block or distort the acoustic signals of clamp-on models.

Fluid Constraints Transit-time models fail if the fluid becomes too dirty; Doppler models fail if the fluid is perfectly clean.

Flow Profile Reliance Requires a fully developed flow profile, demanding long stretches of straight pipe before and after the meter.


PROJECT INFORMATION

No.Purchase Order [PO] Project

No.Pipe

Diameter [mm]

Time [second]

AgtSeptember 2026Okt
MinSenSelRabKamJumSab
303112345
6789101112
13141516171819
20212223242526
27282930123
45678910

Qubic Air [mm3]






Pemegang Saham


1.Allah Subhanahu wa ta'ala

[40% : モスクの建設と布教活動]


2.Nabi Muhammad Rasulullah

[35% : 孤児と貧困者]


3.Ocean & Aerospace Research Institute

[25% : 会社]

PRESIDENT

Prof. H. Jaswar Koto


SECRETARY

Dr. M. Dalil


TREASURER

Dr. Dodi Sofyan Arief