Safety light grids Safety light grids use a transmitter and receiver to create beams of light surrounding a hazardous industrial area.Safety light grids are used to prevent accidents by deteciting the presence of objects or people within a protected hazardous area. Safety light grids are used where hazardous areas must be secured. They are optoelectronic safety devices consisting of one transmitter and one receiver. They conform to the safety requirements of type 2 / SIL 1 or type 4 / SIL 3. Typical applications include access prevention or hazardous area monitoring of robot cells and production lines. For food and beverage applications, units with protective tubes and high protection ratings are offered. Active / passive systems substantially reduce wiring complexity.