Flowmeter Calibration

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School

University of Illinois, Urbana Champaign *

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Course

335

Subject

Aerospace Engineering

Date

Apr 3, 2024

Type

docx

Pages

4

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Calibration of a Flow Meter Instructible Krishna Ramasubramanian - ABH pr16@illinois.edu 9/6/2022 Bill of Materials (BoM): - Pipe Flow Apparatus with Water Supply - Orifice plate - Water holding tank for discharge o Balance beam o Weight markers o Balance pan o Cursor - Stopwatch - Stool - Team Members Step 1 - Background This experiment aims to determine the flow coefficients as functions of the flow rate in terms of the Reynolds number of bulk-flow measuring instruments that rely on observations of pressure change, such as Venturi meters and orifice-plate meters. Then, the experimentally discovered coefficients are contrasted with the remaining 2 devices. Furthermore, a paddlewheel flowmeter will be used downstream of the orifice plate measurement and the venturi effect measurement. There is also a manometer in conjunction with a piezometric differential measurement. In this process of calibration, we will utilize the results of the 3 means of flow measurements in order to calibrate the output signal for monitoring and control. Step 2 – Setup
The flow apparatus already is set in place inside the fluid mechanics lab. The differential manometer and the transducer are required to be at specific flow rates based on differential pressures, and Q is proportional to pressure difference’s heights squared. Next, we also need to have a tank with a drain valve at the end of the valve discharge, a scale for the tank, and a timer. There needs to be a person checking if the pressure differential in the manometer is the correct value based on the flow rate % we want. Then, another team member needs to open and close the valve based on the mass of water in the flow tank. Step 3 - Measurement Calibrating this flowmeter, there are 9 flow rates that we want to get as data points. Starting from the max flow rate, we take 9 different % values that are descending, 90% flow rate, 80%, and so on until 20%. Each of these flow rates correspond to the pressure differential at the start squared. We do this in 2 setups – one with the orifice plate, the other with the venturi effect flow meter. At the discharge tank, we take the time the time it takes to fill the tank to 400 lbs after the discharge valve is closed. Using these data points of the 2 different setups, cross verifying it with the amount of time it takes for the flow to fill up the tank, we correlate it with the different voltage values we get it from the paddle flow meter. The slope we get is the constant correlates with the flow that causes the flow meter to generate electricity.
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