The sensor suite includes pH, ORP and temperature for each tank, and a DO sensor, which may be plugged into the MCU500 control unit or used stand alone, to provide on-line monitoring and spot checking of any tank. The suite of sensors and controls includes those that are applicable to the site in general, and are not a function of the number of tanks.
Controls consist of pump, heater, aerator and feeder controls.
Each configuration of four tanks uses one MCU500 and an expander box. The MCU 500 is the system controller, and comes complete with 18 dual channel signal interface modules installed. The expander houses a general purpose signal connection block for wiring out to the sensors, level detectors and other functions. The expander also contains a relay module for controlling up to 16 relays, a 1200 to 19200 baud modem, a 12 VDC power supply for providing power to external sensors and line amplifiers, fan, and a fiberglass watertight NEMA 4 enclosure with see-through front panel. It performs alarm monitoring and controls system functions using simple on-off control logic to more complex setpoint functions.