Pressure / Vacuum

ifm efector's pressure sensors, vacuum sensors, and pressure switches measure relative pressure. ifm sensors are equipped with a vent that measures atmospheric pressure. The electronics evaluate pressure or vacuum applied to the measuring cell. With relative pressure sensors, when there is no system pressure or vacuum, the sensor registers a pressure reading of 0. When pressure is applied, the sensor registers a positive pressure. When a vacuum is pulled, the sensor registers a negative pressure.