Liquid application device for use as e.g. color applying equipment such as paint spraying gun, has sensor device comprising sensor, which receives test radiation transmitted to surface, and evaluation mechanism evaluating sensor signal

摘要

The device (40) has a sensor device (10) comprising a sensor (20), which receives test radiation (30) transmitted to a surface (50), and an evaluation mechanism (22) for evaluating a sensor signal of the sensor, where the sensor device is detachably arranged at the application device. The evaluation mechanism is arranged far away from the sensor, where the sensor is designed as a reflection light barrier and arranged at the application device. An indicator (24) indicates a condition of the surface based on the sensor signal.