The SpaceMaster series of Thru Beam standards photoelectric sensors is a wide selection of self-contained photoelectric sensors,which are housed in a cylindrical (tubular) housing with different dimensions.These series offers a selection of operation modes, which includes a beam (separate transmitter and receiver),has a diffuse proximity, retro-reflective, and fiber sensor.The transmitter models present in this series,includes a test input that may be used for either disabling or enabling the transmitting power,that are temporarily used for testing purposes or multiplexing applications. These DC models are protected against in a reverse polarity of supplies,it controls the input and output signals.