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4 years ago in Fluid Mechanics , Instrumentation , Physics By Reeta Khanna
How is the pressure scale coefficient determined in an inclined manometer?
I'm calibrating sensitive pressure sensors in my fluid dynamics lab and using an inclined manometer for low-pressure differentials. I need a clear, practical method to determine its scale coefficient accurately for precise readings.
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By Prajwal Sharma Answered 3 years ago
When working with low-pressure differentials in HVAC or aerodynamic testing, I've found the inclined manometer's coefficient hinges on its geometry. The scale coefficient (k) is given by k = ρ * g * sin(θ), where ρ is fluid density, g is gravity, and θ is the incline angle. I would recommend carefully measuring the angle with a digital level, as a small error here magnifies the reading error. In practice, I've seen that tilting the manometer amplifies the liquid's travel distance for a given pressure, making small changes far easier to read accurately than in a U-tube design.
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