Applications

Features

• Measurement is based on coil impedance detection.
• Resists temperatures up to 150℃ as standard
• Insensitive to temperature changes
• Offers fail-safe switch
• Low voltage operation
• Detection made at the end of the detector
• Wide sensitivity adjustment range

Principle of Operation

• When the detector is not covered by the material
  • The electromagnet vibrates at its operating frequency when an alternating current is applied.
  • Back electromotive force on the electromagnet becomes the largest due to change in magnetic field from the magnet
  • The sensor determines the detector is not covered by the material.
• When the detector is covered by the material
  • Applying alternating current does not cause the electromagnet to vibrate at its operating frequency.
  • No back electromotive force occurs because the magnet is stationary.
  • The sensor determines the detector is covered by the material.