Inductive couplers for discrete sensors

Inductive couplers power sensors on a workpiece
Inductive couplers power sensors on a workpiece

Quickly connect up to eight sensors without physical contact

When quick or frequent wiring changes need to be made, inductive couplers can provide a fast and error-free way to connect multiple discrete PNP sensors. Balluff offers two versions to meet your specific application needs. The version in an M18 cylindrical housing can connect to up to four sensors, while the version in a Q40 cuboid housing can connect up to eight sensors. These IP67-rated couplers transmit power and signals across a small air gap.

An inductive coil in the base and remote units sends and receives the magnetic signals. A single base unit can be used with multiple remote units, so you can create several wiring setups on the remote-unit side and interchange them as needed. Balluff’s passive junction boxes make this wiring a simple task. To connect to the base unit, simply place the base in front of the remote. Perfect alignment isn’t necessary, and their orientation can be changed. They begin communicating once they are in close proximity, at which point LEDs on the base and remote will switch on to indicate that a connection is active. Magnetic mounts for the Q40 models protect the couplers and keep them aligned and at the optimal distance.

This is a smart retrofit to replace electromechanical or hardwired connections on existing machines. A slip ring or rotary connector will eventually wear out, but an inductive coupler avoids mechanical failure, since the base and remote don’t come in contact. Changing a die or mold often requires disconnecting and reconnecting cables, where it’s easy to bend a pin in the connector or put other stresses on the connector, eventually causing it to fail. With inductive couplers, you mount the remote coupler at the same position on each die or mold, and then swap as needed. Give your machines a productivity boost by changing out wired connectors for non-contact ones.


  • Two form factors
  • 18 mm cylindrical (M18) housing for up to four sensors
  • 40 mm cuboid (Q40) housing for up to eight sensors
  • IP67 protection for harsh environments
  • Internal temperature monitoring
  • LEDs visualize operating status on base and remote