A process for preparing fluorochemical monoisocyanates comprises reacting at least one fluorochemical alcohol represented by the formula CnF2n+1SO2NCH3mOH, wherein n=2 to 5, and m=2 to 4, with 4,4\u2032-diphenylmethane diisocyanate in a solvent in which the resulting fluorochemical monoisocyanate is not soluble; wherein the molar ratio of fluorochemical alcohol:MDI is from about 1:1 to about 1:2. The MIM capacitor includes two terminals that extend to a plurality of interdigitated fingers separated by an insulator. The control system further includes a moisture sensor outputting a sensor signal during the dry operation, or a photo coupler outputting voltage pulses when the motor is in operation during the dry operation. The collet, in use, locks the leading end of the hasp of the seal into the body. The CPU determines whether a fault has occurred in the relay based on the control signal sent to the relay and the detection of the relay fault detection circuit.