Linear Beam Detector can automatically carry out system adjustment, compensation of variation of ambient data, and judgment of fire and fault through the fixed algorithm, and indicate these states by LED and signal output terminals. With a new and reasonable design, attractive appearance, flexible adjustment, and alignment method, it’s easy to install and adjust. The sensitivity of the detector can be set through a handheld programmer in the field, decreasing the demand for cleanliness of field conditions, and enlarging application areas.