Sensor with a cleaning device

A sensor comprising:

• a sensor housing defining an interior and including a housing window;
• a sensor unit disposed in the sensor housing and configured to emit a sensor signal through the housing window and to receive a detection signal through the housing window;
• a cleaning unit including a cleaning element, a shaft and a drive,
• wherein the cleaning element is attached to the shaft such that the cleaning element selectively contacts the housing window from an exterior direction,
• wherein the shaft extends through a wall of the sensor housing, connected to the cleaning element exterior of the sensor housing and to the drive in the housing interior, and wherein the shaft is operable to rotate about an axis of the shaft and to translate within the sensor housing, and
• wherein the drive is connected to the shaft and is configured to cause the shaft to rotate about the axis and the cleaning element to move across the housing window;
• and
• a pressing unit configured to exert an adjustable contact pressure on the cleaning element such that the cleaning element is pressed against the housing window with the contact pressure,
• wherein the pressing unit comprises a magnetic module disposed within the sensor housing and including a magnetic field generator and a magnetic counterpart, wherein the magnetic field generator is configured to generate an adjustable magnetic field, and wherein either the magnetic field generator or the magnetic counterpart is connected to the translating shaft of the cleaning unit, and moves therewith, such that the contact pressure of the cleaning element is adjustable via the adjustable magnetic field acting on the magnetic counterpart.