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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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