Water in Fuel Sensor Series - Resistance

External overview image
Roll Over to Zoom
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.

The purpose of the sensor is to detect the presence of water in diesel fuel. The sensor is mounted inside of the fuel filter and has two main output signal stages, low level and high level, which identify the presence and absence of water. The output signal level is changed when water reaches a defined water level in the fuel filter.



  • Diesel filters
  • Fuel tank systems
automotive-sensor-customLittelfuse vehicle sensors are designed for customer-specific applications and packaging. To learn more, contact Littelfuse.

  • Suitable for low pressure and high-pressure systems
  • Operating temperature range: -40°C to +135°C

  • Resistance measurement for fluid applications

  • Robust, simple, cost effective design

  • Works with different fluid parameters

  • Wide voltage supply range: 5 V to 36 V

  • DC or AC measurement method can be used

  • Integrated self-test

  • Choice of connectors and terminals

To request product environmental information, please complete the Product Environmental Information Request Form.