In industries, Liquid levels are measured either directly or indirectly. In direct method level can be measured by using indicators such as dipsticks, floats, and gauge glasses. Where as in indirect method, it is measured using static or differential pressure instruments. Normally Direct measurements are used only for local indication, meanwhile Indirect measurements are used to provide both remote indication and a control signal.
Direct method
Direct methods are used only for monitoring or getting indications locally. Even though in industries, it is used for various reasons on many types of substances. There are different types of instruments for this purposes. Some of them are discussed below.
