Water in Fuel Sensor Series - Resistance

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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

Access specifications, certifications, check availability and order parts below

Catalog #Supply Voltage (V)Operating Temperature (°C)Switching Resistance in Water (kohms)Switching Resistance in Fuel (kohms)Self Test Duration (sec)Switch Delay (sec)
Water in Fuel12 or 24 Battery-40 to +12519035032
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