Absolute pressure sensors are used for pressure measurement against a reference pressure of 0 bar (vacuum). This can be used e.g. to determine the pressure in a closed system independent of the atmospheric pressure. They are suitable for measuring the negative pressure relative to the external pressure. In particular, it is possible to measure the ambient pressure against the vacuum, which is used for the barometric pressure measurement.
The range of AMSYS absolute pressure sensors extends from simple OEM sensors without amplification to high-precision amplified transmitters with adjusted standard output values.