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Apparatus for detecting water in fuel

  • US 4,638,305 A
  • Filed: 03/22/1985
  • Issued: 01/20/1987
  • Est. Priority Date: 03/22/1985
  • Status: Expired due to Fees
First Claim
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1. Apparatus for detecting water in a fuel container wherein the fuel has a tendency to deposit an insulating coating on surfaces it contacts, comprisinga conductive probe for location in a conductive fuel container at a level to contact water that may collect in the container, so that the probe when contacting the water in the absence of an insulating coating, will be resistively coupled to the container and when contacting the water while covered with an insulating coating will be capacitively coupled to the container, anda detection circuit coupled to the probe and having means responsive to low probe resistance or high probe capacitance for generating an output signal indicative of water contact with the probe.

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