first mounting the dispenser controller 32 to a solid surface typically the pump s 34 associated with the system are integrated with the controller 32 a first fluid supply line 38 is installed between a pump 34 and a respective fluid reservoir 36 a second supply line 38 is installed between each pump 34 and the washing machine 40 next each sensor 10 is connected to the controller 32 by means of the cable assembly 20 if a quick connector 26 is provided the cable assembly 20 may simply plugged in to a mating female connector on the controller 32 one sensor 10 is used for each relevant electrically operated valve or motor 42 in the washing machine a typical ware wash application will require two sensors laundry dispensers may require multiple sensors each sensor 10 is connected to the exterior housing of its associated electrically operated device advantageously the sensor need not be hard wired into the electrically operated device simply mounting the sensor 10 to the exterior housing of the device in particular adjacent the electrical coils of the solenoid or motor suffices in a preferred embodiment the sensor 10 is strapped to the housing of the electrically operated device with a hook and loop fastener however many other surface mounting arrangements for example releasable adhesives are perfectly suitable all of the controllable machine components on these washing machines operate on electromagnetic principles and therefore produce flux fields practical considerations of the design of these devices dictate that some.