First, convert the non-metric measurements to metric ones. Then, convert the manometer reading to standard units of pressure. Use the standard formula p = d * h * 9.8 where “p” is the pressure in pascals, “d” is the density of the liquid in the tube in kilograms per cubic meter, “h” is the doubled height difference in meters from step 1 and 9.8 is the downward force of gravity, 9.8 ...
Figure 6. The pressure reading is always the difference between fluid heights, regardless of the tube sizes. With both manometer legs open to the atmosphere, the fluid levels are the same (A). With an equal positive pressure applied to one leg of each manometer, the fluid levels differ, but the distance between the fluid heights is the same.
An aneroid manometer is a device used by medical professionals to measure blood pressure, which is the force exerted on the walls of the arteries as the heart pumps blood around the body. The aneroid manometer is one of three main types of sphygmomanometer; both aneroid manometers and mercury manometers must be read manually and are used pretty much the same way, while the third, a digital ...
Inclining the indicating tube has opened up the scale to permit more precise reading of the pressure. To improve and expand readability, certain Dwyer U-type and well-type manometers are available with a .826 sp. gr. red oil indicating fluid, and scales compensated to read pressure directly in inches of water.
Gas Laws: Pressure. Page 1 of 5. Gas Laws Pressure Concepts Pressure ( P ) is the ratio of the force ( F ) exerted upon a surface to the surface area ( A ). P=F/A A manometer is an device employed to measure pressure. There are a variety of manometer designs. A simple, common design is to seal a length of glass tubing and bend the glass tube into a U-shape.
How to Read a Manometer. Updated April 25, 2017. By Erin Watson-Price. A manometer is used to measure the pressure difference between two gases, often atmosphere and the gas being tested. A typical manometer consists of a U-shaped tube filled with either mercury or liquid. The long sides of the tube have a measuring scale marked off in millimeters.
The open manometers are used to read pressure differences with air as one leg. You can do positive or negative pressure differences with the same set-up. Just read the level of both columns and subtract the to get the difference in mm or inches.
Convert the manometer reading through to pressure in This really is provided by the conventional formula P(B) — P(A) = dhg where d may be the density water in kilos per cubic meter (1,000 kg/m^3), h may be the height differential in meters and g may be the acceleration of gravity in meters per second squared (9.8 m/s^2).