Liquid manometers, because of inherent accuracy and simplicity, have applications in every industry and laboratory. They are unique in being both basic pressure measurement instruments and standards for calibration of other instruments. Despite their simplicity and wide useage, their principle of operation, the advantages of various types and the basic accuracy factors associated with them are not known by all.
The manometer has many advantages in this age of technology. Containing no mechanical moving parts, needing nothing but the simplest of measurements, the primary standard manometer is readily available at modest cost. The principle of the manometer has not changed since its inception, however great strides have been made in its arrangement and the application of the instrument to various industrial measurement requirements. Whereas formerly the manometer was considered a laboratory instrument, today we find the manometer commonly used to measure pressures ranging from as high as 600 inches of mercury to space vacuums.
The manometer utilizes the hydrostatic (standing liquid) balance principle wherein a pressure is measured by the height of the liquid it will support. For example, the weight of a column of mercury at 0 deg C that is one inch high and one inch in cross sectional area is .4892 pounds. Thus we can say that a column of mercury one inch high imposes a force of .4892 pounds per square inch or .4892 PSI.
Transcat offers calibration services for manometers throughout our network of nationwide accredited calibration laboratories. No matter your process, application, or manometer type, we can ensure that your measurements are reliable and accurate.