Inductive proximity switch, has supplementing coil connected firmly with screen, where supplementing coil develops compensation field, which is proportional to transmission field, which is produced by transmitting coil

摘要

The switch has a spool carrier (7) including a transmitting coil (1) and a receiving coil (3). Electrically conducting screen (5) is arranged at a distance to the spool carrier. A supplementing coil (4) is connected firmly with the screen. The supplementing coil develops a compensation field, which is proportional to a transmission field, which is produced by the transmitting coil. The supplementing coil is connected in a receiving coil circuit.