What are Level Switches?
A level switch (often called a level sensor) is a device often installed in certain tanks, containers and vessels to trigger an alarm when the solid or liquid in the storage device reaches a certain level. Using a PNP/NPNM output or a relay it can also start of stop the discharging of a material or a fluid if connected to some type of solid state or programmable logic controller.
Are Level Switches Used for Monitoring Intermediate Levels in a Tank?
No! Level switches are not designed to measure continuous level, however, many continuous level devices also have options to act as level switches. If this is the case, then why opt for a level switch? The reason to buy a level switch is often economic reasons. A level switch often costs less than a level transmitter. In addition, a level switch is often much easier to understand and install.
What are some different types of level switches popular in the industry? Some of the most common types which are widely used are:
Rotating Paddle Level Switches
Capacitance Type Level Switches
Vibrating  Fork Level Switches
Float Level Switches
Conductive Type Level Switches
Ultrasonic Type Level Switches
Pressure Based Switches
The following educational video gives a brief description of each type. Of course, there are other types of
level switches in use for special applications in a process that requires. The selection of level switch types is often based on the existing technology in use. If the existing type of level switch has been found to be reliable over extended periods with little maintenance required it is common for operators to keep using the same type of switch.
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