Flexibility Redefined – The All-Round Solution in Each Housing. For the first time, state-of-the-art product design combines several photoelectric families of sensors with innovative technologies in one housing design. The R100, R101, and R103 series differ only in mounting method and housing design. Once you determine how you would like to mount the sensor, you can freely select the required functions according to the task. This all-round solution provides a unique flexibility and opens up a variety of possible applications.