SICK VL18L-3P344 Photoelectric sensors. SICK VL18L-3P344 is a photoelectric sensors in the V18 family. SICK identifies this exact configuration as manufacturer article 6027597. The official technical record specifies Functional principle: Photoelectric retro-reflective sensor; Housing design (light emission): Cylindrical, straight; Sensing range max.: 0 m ... 25 m; Sensing range: 0.1 m ... 35 m 1); Type of light: Visible red light; Light source: Laser. The linked SICK data sheet is specific to VL18L-3P344.