Level switch, also known as water level switch, level sensor, as the name implies, is used to control the level of the switch. From the form is mainly divided into contact type and non-contact type. Capacitive level switches are commonly used in non-contact type, and the floating ball level switch is the most widely used. Electrode type liquid level switch, electronic liquid level switch, capacitive liquid level switch can also be implemented by contact method.
What are level switches and level meters?
Factories, plants, various facilities, rivers and utility tanks all need to monitor and control the level and remaining volume of liquid, powdered or granular materials. Level switches and level gauges detect and measure materials such as liquids, powders and granular materials in tanks, vessels and pipelines.
The switch captures the electrical difference between empty and full material to detect the liquid level. When the material is empty, the electrical state of the detection electrode and ground electrode is: resistance (Ro) is infinity and capacitance (Co) is the specific capacitance value, determined by the installation state.
What is a liquid level switch?
Liquid level switch is a sensor that detects the presence of liquid, powder or granular material at a specific location. (Also called a liquid level sensor.) For example, when liquid is supplied to a tank, it can overflow. To prevent spillage, the level switch is installed near the top of the tank. When the liquid comes in contact with the level switch, it outputs a signal to prevent the liquid from spilling out of the tank. (Detecting whether the tank is full of material is called full detection or upper limit detection.) On the other hand, a level switch is used to prevent the tank from emptying completely when the level drops as the liquid is discharged. This is referred to as an empty detection or lower limit detection.
What is a level meter?
Unlike level switches, level meters these devices continuously measure the volume of liquid, powder or granular materials. (This is also referred to as a continuous level meter, liquid level meter, or powder meter.) While a level switch can detect the presence of material at a point, a level meter outputs a reading of the total liquid volume in the tank, usually from 0 to 100%. Therefore, a level meter can monitor and control volume in greater detail than a level switch. Level meters typically output readings at small currents of 4 to 20mA. (4mA for 0%, 20mA for 100%, and 12mA for 50%.).