Methods of level measurement are:
Continuous level method: In this method, continuous level sensors are employed which determine liquid level within a given range instead of at a single point. These sensors usually indicate the correct amount of substance in the specified area. These sensors are extra sophisticated and capable enough to perform level monitoring for the complete system. Via this method an analog output is generated which directly correlates to the level in the container.
Point level method: In this method, point level sensors are used which can only detect whether the substance level is above or below the sensing point. This method is typically used to deal with fluid levels which are exceptionally high or low.