Construction of manometer

A manometer can be built by filling a clear plastic tube with a coloured liquid to allow the fluid level to be easily observed. The tube is then bent into a U-shape and fixed in an upright position. The levels of the fluid in the two vertical columns should be the same or equal, as they are currently exposed to the same pressure. This level is therefore marked and identified as the zero point of the manometer. The manometer is placed against a measured scale to allow any difference in the height of the two columns. This height differential can be used directly to make relative comparisons between different test pressures. This type of manometer can also be used to calculate the absolute pressure when the density of the liquid in the manometer is known.Calculation The pressure exerted by a column of fluid can be given by the equation P = h.ρ.g this equation, P is the calculated pressure, h is the height of the fluid, g is the force of gravity and ρis density of the water. Because the manometer is measuring a pressure differential rather than an absolute pressure, we use the substitution P = Pa - P0. In this substitution, Pa is the test pressure and P0 is the reference pressure. Formula; Pressure=F/A, Volume=h.A, ρ=m/v orifice diameter=2.1cm or 0.021m Pressure of fluid= P= h. ρ.g radius=D/2 N= (kg.m)/s2 Force of gravity= 9.81m/s2 Density of water=1000kg/m3 Measurement At 3230 1: butterfly position-1.82kΩ 2: Pressure gauge reading-3Kpa 3: Temperature at -240˚C 4: Pressure different at P1and P2=19.62N/m2or 0.01962 Kpa Manometer reading Density of water=1000kg/m3 Force of gravity= 9.81m/s2 Height (h) =2mm or 0.002m N= (kg.m)/s2 Pressure of fluid= P= h.ρ.g P=0.002m×1000kg/m3×9.81m/s2 P=19.62kg/ms2 N=kg/ms2 P=19.62kg/ms2× N/kg.m/s2 P=19.62N/m2or 0.01962kpa