Corrosion monitor

A method for detecting corrosion on a chassis of a device, comprising:

• receiving, by a constant current source mounted on a printed circuit board, a power supply;
• outputting, by the constant current source, a substantially constant current to a first standoff, the first standoff separating the printed circuit board from the chassis;
• receiving, by a corrosion sensor mounted on the printed circuit board, a first input voltage from a second standoff, the second standoff separating the printed circuit board from the chassis;
• receiving, by the corrosion sensor, a second input voltage from a third standoff, the third standoff separating the printed circuit board from the chassis;
• outputting, by the corrosion sensor, a signal proportional to a resistance of the chassis based upon the first input voltage and the second input voltage to a processor mounted on the printed circuit board;
• and
• determining, by the processor, a corrosion level of the chassis by comparing the signal proportional to the resistance of the chassis to reference data stored in a memory communicatively coupled to the processor.

A corrosion detection system for an electronics assembly comprising:

• a metal chassis configured to support an electronics device;
• a corrosion monitor including:
• an insulated substrate;
• a plurality of standoffs extending between the insulated substrate and the metal chassis;
• a constant current circuit supported on the insulated substrate and electrically coupled to a first standoff for outputting a constant current to the metal chassis;
• a corrosion sensor supported on the insulated substrate and having a first input electrically coupled to a second standoff, a second input electrically coupled to a third standoff, and an output configured to output a signal proportional to a resistance of the metal chassis based upon a voltage induced by the constant current circuit at the first input and the second input;
• and
• a processor in communication with the corrosion monitor and configured to receive the signal proportional to the resistance of the chassis of the device from the corrosion monitor, determine a corrosion level of the chassis of the device by comparing the signal proportional to the resistance of the chassis from the corrosion monitor to the reference data stored in a memory associated with the processor, and output a signal based on the corrosion level.