Level Sensing Series - PWG™

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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

Littelfuse Pulsed WaveGuide™ (PWG™) sensor technology, patent pending1, is a cost effective linear position sensing technology that is capable of producing a highly versatile, robust and accurate distance measurement solution.

The Pulsed WaveGuide Sensor package contains signal conditioning electronics and a screened wave guide transmission line - the sensing element. When used in conjunction with a suitable permanent magnet, the signal transmitted along the wave guide is reflected at the magnet position. The time of flight between start of transmission and the reflected signal is directly proportional to the distance between the start point of the wave guide and the magnet position.

In order to minimize power consumption, the measurement frequency can be optimized. In addition, the measurement mode can also be set to burst mode and poll mode. In burst mode the system enters a sleep state and awakes to report position at preset intervals; in poll mode the sensor reports position upon demand from an ECU.



  • Linear actuator position sensing
  • Liquid level sensing, SCR
  • Valve position sensing
  • Clutch and brake cylinder piston position
  • Vehicle suspension height sensing
  • Robotic applications
  • Industrial positioning applications
automotive-sensor-customLittelfuse vehicle sensors are designed for customer-specific applications and packaging. To learn more, contact Littelfuse.

  • Contactless linear position sensor

  • Robust, simple, cost effective design

  • Works with Ferrite magnet 4mT (40Gauss)

  • Sensor stroke lengths up to 340mm

  • Longer designs feasible upon request

  • Accuracy without correction < 2%

  • Low current consumption < 20mA

  • Operating temperature range: -40°C up to +145°C


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