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What are Manometers?

12/9/2013 1:04:27 PM | by Anonymous


Manometers are devices for measuring pressure and could be atmospheric pressure by liquid or gas. The types of pressure manometer devices can include mercurial manometers and digital manometers. The mercury manometer is made using the length of glass tubing. It is sealed at the end and mercury is then placed into the tube such that there will be no air remains at the sealed end of the tube. The tubes is bent into U shape with the sealed end at the top of the branch U and open the end at the top of the other branch U.


The mercury can move along in the tube and there should be no air allowed therefore it can produce the downward pressure on the mercury. However, the open end tube can be exposed to the gas or air by the pressure of which it is to be measured. The only difference is the height of mercury in two sides of the manometer which can provide the measurement and enable the pressure of the gas to be determined. The measuring pressure was used in the early days of the physics research; the pressure is specified in units of ‘millimeters of mercury’. The measurement is 1mm hg and it refers to the pressure that can result in the difference of one millimeter in a mercury manometer tube.


In addition, the manometers can be used to pressure the speed at a stream of air that is flowing. The open end of a gas manometer can be placed into an area of airflow to determine the speed of the moving air as well as measuring the pressure changes.


There are many techniques that have developed for measurement of the vacuum and pressure. They are used to measure pressures that are called as pressure or vacuum gauges. These manometers are instruments that use the liquid to measure pressure though the term is used to mean any pressure measuring instrument.


Vacuum gauge is to measure the pressure in the vacuum and is further divided into two subcategories such as high and low vacuum. Sometimes, it is also known as ultra high vacuum. This applicable pressure range has many techniques which are used to measure vacuums and has an overlap hence combining these several different types of gauge to measure the system pressure continuously from 10mbar down to 10−11 mbar.


In some cases, these measurements are made to vacuum or to other specific reference when distinguishing between these zero references. For example, absolute pressure is a zero referenced against a prefect vacuum and is equal to a gauge pressure plus atmospheric pressure whereas the gauge pressure is zero referenced against ambient air pressure and is equal to absolute pressure minus atmospheric pressure.


Zero reference is usually used to imply by context and words that are added only when clarification is needed. The blood and tire pressure are gauge pressures from convention while the atmospheric pressures, vacuum and altimeter pressures must be absolute.


The most common used is in the industrial processing systems as the differential pressures. The differential gauge has two inlet ports and each is connected to one of the volumes whereby the pressure needs to be motivated. When a gauge performs the mathematical operation of subtraction through mechanical means to obviate the operator to control the system and watch the separate gauges and determine the difference in readings.

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