The liquid level switch (also known as the liquid level controller) is an automatic instrument used to detect the position of liquid or bulk materials (such as powder, granules) and trigger the switch signal. It is mainly used for liquid level monitoring and equipment protection in industrial processes. The following are its core functions and classification characteristics:
1. Core function
Limit position alarm
Detect the high/low liquid level of liquid in containers such as storage tanks and pipelines, trigger relay signals (such as normally open/normally closed contacts), link the alarm system or control the start and stop of pumps/valves to prevent overflow or idling.
Example: Automatically start water replenishment when the water tank is short of water, and close the feed valve when the oil tank is full of liquid.
Equipment protection: Avoid dry burning (boiler), overload (pump) or material blockage (conveyor) to extend equipment life.
Process automation is integrated with PLC and DCS systems to achieve unattended liquid level control.
Typical applications:
Chemical tank overflow alarm
Food and beverage filling line liquid level control
Dry run protection of sewage treatment pumps