pump 68 is controlled by microprocessor 20 through lead 86 in operation the process starts when power is supplied to the electrodes 24 and 26 the microprocessor 20 checks all sensor inputs such as the temperature sensor 38 water level sensor 44 water level sensor 60 pressure sensor 62 etc if the pressure within expansion chamber 58 is within its specified range the reactor will not be activated further if the water level and temperatures are within the preferred operating range the pump 68 will not be activated microprocessor 20 continuously checks the signals from the sensors and initiates a response when any signal indicates need if the pressure is below the specified range as sensed by the sensor 62 microprocessor 20 initiates the servo drive 36 to move carbon electrode 26 toward or away from carbon electrode 24 to achieve the optimum for the most efficient operation monitoring the feedback from the reactor power sensor 22 this operation continues until the signal from the pressure sensor 62 indicates that the pressure is within the operating range the signals from the water level sensors 42 and 60 and the temperature sensor 38 is monitored continuously the pump 68 functions to add water to the system or circulate water through the cooler 78 the direction of the pump operation determines the function water level takes precedence over temperature if the water levels falls below the required point as indicated by the combined logic of the two level sensors 42 and 60 pump 68 is operated in the reverse mode and moves water from the external water supply through the directional check vale 80 to.