SICK GSE6-N1221 Photoelectric sensors. SICK GSE6-N1221 is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1064675. The official technical record specifies Functional principle: Through-beam photoelectric sensor; Sensing range max.: 0 m ... 14.5 m; Sensing range: 0 m ... 10.6 m; Polarisation filter: No; Light source: LED 1); Type of light: Infrared light. The linked SICK data sheet is specific to GSE6-N1221.