in fig9 the device 1 is designed to allow the end user to interface with a scada system via remote communication the plc may be programmed to open the chlorine sensor system sampling solenoid valve 59 on a timed basis or based on prior readings or by a remote operator when the chlorine sensor 51 signals indicate to the plc that chlorine levels have fallen below a predetermined threshold the plc opens the main valve 33 until chlorine levels reach a desired value or a maximum flush time has been reached if the plc detects that voltage levels in the batteries 75 have fallen below a set level it opens the main valve 33 to run the turbine until the batteries are fully charged then continues for a set period to trickle charge the batteries while throwing most of the turbine 39 s output to the dissipaters 55 if the temperature sensors 10 are of a type which sends temperature information rather than a simple under temperature reading when the plc detects that the temperature has fallen below a predetermined value illustratively 37 u00b0 f 3 u00b0 c it opens the main valve 33 to run the turbine 53 and connects the turbine to operate the fan heater 83 it will be noted that the turbine may simultaneously charge the batteries 75 and generate heat through the dissipaters 55 when the temperature sensors 10 detect that the temperature within the enclosure has reached a set point illustratively 45 u00b0 47 u00b0 f 7 8 u00b0 c the main valve 33 is closed because the valve 33 is controlled by a latching bistable solenoid 39 it should determine the state of.