Patent ID: 6930493

Claim:
A system for monitoring the concentration of a detergent in a detergent solution used for decontamination of an article, the system comprising: sensing means responsive to changes in the concentration of the detergent in the detergent solution to produce an output signal indicative of a measured detergent concentration, said sensing means including a capacitor having first and second electrical conductors exposed to the detergent solution, wherein said detergent solution comprises a dielectric therebetween, said capacitor having an electrical property that varies according to the concentration of the detergent in the detergent solution; a memory for storing a set of data including (a) measured values associated with the electrical property of the capacitor and (b) corresponding detergent concentration values indicative of the concentration of the detergent in the detergent solution; processing means for receiving the output signal from the sensing means and determining the concentration of the detergent in the detergent solution by accessing the set of data stored in the memory.