ECS equipment reliability through wetting current

An analog to digital converter (ADC) circuit comprising:

• an analog input terminal configured to receive a signal from a sensor;
• a current driver output terminal connected to a switch,
• wherein the switch comprises electromechanical switch contacts, and
• wherein the switch is configured to indicate a position of a temperature control valve;
• a current driver circuit configured to provide a first current at the current driver output terminal, wherein the switch is configured to combine the first current and a second current such that the combined first current and the second current provide a wetting current for the switch.

A method for supplying wetting current to a switch, the method comprising:

• receiving, by the switch, a mechanical input,
• wherein the mechanical input causes electromechanical contacts of the switch to close,
• wherein a temperature control valve provides the mechanical input, and
• wherein the switch provides an indication of the position of the temperature control valve;
• receiving, by the switch, a first current from processing circuitry;
• receiving, by the switch, a second current from an analog to digital converter (ADC) circuit, wherein a combined first current and second current provides a wetting current to the electromechanical contacts of the switch.