Pressure and vacuum calibration system

Physical magnitude that measures how a force is applied in a perpendicular direction and distributed uniformly on a surface. It is calculated as the quotient between the applied force and the corresponding area.

The unit for pressure in the International System is the Pascal (Pa), defined as the pressure applied by a 1N force on a 1 m² area.

A weighing tool is a measuring instrument that is used to determine the mass of a body, using the action of gravity on said body.

On the basis of the functioning mode, we distinguish:

• Absolute pressure: pressure measured from vacuum
• Atmospherical pressure: pressure exerted by the atmosphere on the Earth's surface. In absolute pressure, atmospheric pressure has a value of 101325 Pa
• Relative pressure: pressure measured with reference to the atmospheric pressure. That is, in relative pressure, the atmospheric pressure has a value of 0 Pa.
• Diferencial pressure: difference in pressure among two systems
• Vacuum: pressure that is less than atmospheric pressure.

• Manometers: instrument that measures pressure
• Vacuum gauges: instruments that measure vacuum
• Manovacuum meter: instruments that allow to measure pressure and vacuum
• Barometer: instruments that measure atmospheric pressure

Calibration consists of comparing the values indicated by the measuring instrument that is to be calibrated with the values of the pattern masses that are used in specific conditions and with a defined method, that takes into consideration the influence of the different factors that affect the reading of the equipment that is to be calibrated. The calibration is carried out in a controlled and documented way.

The calibration ensures the reliability of the measurements of the calibrated equipments and to warrant the adequate functioning in the facilities and processes where they are used, contributing to increase quality.

The result of the calibration is collected in a Calibration Certificate, where the correction values to be applied in different considered calibration points will be indicated, as well as the uncertainty of those measures.