There are many different level sensing technologies to choose from on the market today, some very simple, easy to use and cost effective, others more complex and very expensive.
One way or another they all do a similar job which can be broken down into two basic categories; sensors that are for point level detection, in other words they can determine whether liquid is present or absent. And sensors that are for continuous level detection of liquid levels – otherwise known as sensors that can tell you the exact level of liquid present.
It depends entirely on what your application requirements are. Some applications may benefit more from knowing exactly how much liquid is present, where as others may only need to know if there is a liquid present or not.
We will begin by distinguishing between both types of sensor technologies.
What is a point level sensor?
Point level sensors are devices that can detect the presence or absence of almost any liquid media. Generally, these sensors are used for processes where high or low levels need to be detected. Typically, the most common applications that require a point level sensor fall into two categories; leak detection – preventing expensive damage to equipment or service interruption or level measurement – preventing overspill or run dry situations. The technology works like a switch to drive an action when the tank or vessel level reaches above or below a certain threshold.
Examples of liquid level sensors that can work as point level sensors:
What is a continuous level sensor?
Continuous level sensors provide a constant measurement of liquid and deliver precise and accurate levels of the liquid within the tank/vessel at anytime. Typical applications that require a continuous level sensor are processes where it is vital to know the liquid level or where high accuracy is essential, such as process control or inventory control and management.
Examples of liquid level sensors that can work as continuous level sensors:
It is important to make sure you consider the range of factors that could influence the type of technology you choose. Environmental factors such as temperature, pressure, chemical compatibility, range of measurement and output will determine the type of technology suitable for your application.