Knowledge – Pressure Measurement – Pressure species

It often occurs in the selection of pressure sensors or gauges to the question what is the difference between absolute pressure and relative pressure.

For relative pressure measurement of differential pressure and the ambient pressure is always measured. In the pressure measurement to determine the relative pressure and differential pressure is the most widespread. The relative pressure is often measured for the determination of the hydraulic pressure or the air pressure in closed systems. If the gauge pressure greater than the ambient pressure is often talk of overpressure. If the pressure is less than the ambient pressure is called the pressure measurement of negative pressure or vacuum.
The absolute pressure refers to the pressure measurement technology always at the absolute zero, also called absolute vacuum. A widespread absolute pressure measurement is the measurement of the ambient pressure by means of a barometer.