“Cascade control” Master loop as level and Slave loop as flow because Slave loop has faster development than the level. Slave loop will receive CO % value from Master loop to be Remote set point for Flow Indicator Controller (FIC). FIC value will transfer from Flow Valve to flow process, which have Recorder for record Flow’s PV % value from Flow Indicator Transmitter (FIP). Then, will continue send the value to Controller and send the feedback to control the value as needed. Later on, the value from Slave loop (flow) was sent to adjust the level value in Master loop to control the water level in tank OZ. Which have Level Transmitter as the sensor to measure the value and send the data to Level Indicator Controller for control the level of tank OZ as needed again.