Safety gratings are also safety light curtains (also known as safety protectors, punch protectors, infrared safety devices, etc.). In modern factories, people work with machines on potentially hazardous machinery such as stamping machines, shearing equipment, metal cutting equipment, automated assembly lines, automated welding lines, mechanical transfer handling equipment, hazardous areas (toxic, High pressure, high temperature, etc.), it is easy to cause personal injury to workers.

Of course, there are some differences in the application fields. If used in the field of measurement, people often refer to safety gratings as safety light curtains or measuring light curtains or detecting light curtains.

If used for dimensional or volumetric measurements, measuring light curtains is an important part of the measurement system.
Generally used to measure the volume, it is necessary to use three sets of light curtains to measure the length, width and height respectively, and then calculate the volume through software. Among them, other components include a line, a weighing device, and the like as needed.

Measuring light curtains, usually equipped with a controller, with software to allow, the measured data can be displayed by industrial computer or directly print out data.