Patent ID: 11940297
Assignee: ACLARA TECHNOLOGIES LLC
Field: Measurement (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 14:
15. A contaminant detecting device comprising:
a resistive voltage divider, the resistive voltage divider comprising a constant resistor electrically connected in series with a variable resistor and a voltage source thereacross, the variable resistor comprising a serpentine structure comprising a plurality of detective fingers formed from conductive material separated by a non-conductive substance, wherein an overall resistance of the variable resistor when the serpentine structure is in contact with a contaminant is less than an overall resistance of the variable resistor when the serpentine structure is not in contact with the contaminant such that when contacted with the contaminant the overall resistance of the variable resistor decreases, thus decreasing an output voltage of the resistive voltage divider.