The growing level of mechanization and automation in the manufacturing sector today has led to increased focus of players towards the efficiency of plant and hence the production processes. Thus it becomes vital to stop unscheduled outages of machines and optimize its performance. Condition monitoring is a process that provides information about the health of a machine by well-timed monitoring of machine condition. High availability of machines is the most significant lever for increasing productivity of a manufacturing unit, therefore it becomes necessary to identify potential sources of errors beforehand. The condition monitoring system intends to predict the mechanical wear and failure of a machine and facilitates preventive maintenance, reduce repair time and hence down time of a machine. Vibration, temperature and noise measurements are the key indicators used in machine condition monitoring. Condition monitoring system acts as an important tool particularly for difficult to reach plant and machines that can only be reached under specific condition such wind turbine and oil & gas plants, so the condition of machine is monitored regularly using online machine condition monitoring system. Other type of condition monitoring systems available are route-based monitoring, portable machine diagnostics, factory assurance test and online machine protection.