Experimental of Pressure Measurement Using a Variable - Angle Inclined Manometer

Abstract

Accurate measurement of small pressure differences presents a significant engineering challenge due to the resolution limits of standard vertical manometers. This study designs, constructs, and systematically evaluates a variable-angle inclined manometer to measure small hydrostatic gauge pressures and analyse the direct impact of the inclination angle (θ) on scale sensitivity and fluid displacement. Using colored water (ρ=1000〖" kg/m" 〗^3) as the working fluid, a constant pressure source was introduced across tilt angles ranging from 15^∘ to 90^∘. The experimental findings confirm that decreasing the inclination angle significantly amplifies the observed fluid displacement (L) along the incline, thereby elevating instrument resolution. At θ=15^∘, the displacement length reached a maximum of 6.0 cm, providing a sensitivity amplification factor of 3.86 relative to the vertical reference. The experimental data successfully validated the law, displaying an average calculated pressure of 151.4 Pa with minor deviations stemming from capillary action and parallax effects. This research highlights the practical application of geometric optimization to enhance the operating performance of fluid monitoring instrumentation.