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Level Sensors and Their Use in Businesses

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When you want to measure the amount of fluid flowing in a closed or open system, the easiest way is to use a level sensor. The sensor is either connected to an output device that transmits the reading results to a monitoring device or the sensor transmits wireless reading results to the monitoring device. The sensors are continuous level sensors that accurately measure fluid levels to a specific limit or point level sensors that show if the fluid level is high or low.


Types of level sensors include ultrasonic level sensors, capacitance or radio wave level sensors, optical level sensors and microwave optical sensors. Each type serves different purposes and measure the level of different types of liquids. Sensors are useful because they can determine liquid levels in locations that are dangerous and inaccessible for human beings. Ultrasonic level sensors use sound waves to determine liquid levels while capacitance sensors use radio waves to detect the level of liquids. The difference between ultrasound and radio waves is that radio waves can travel when no medium is present while ultrasound waves can travel only when there is a medium.

Ultrasonic Level Sensors

Ultrasonic level sensors use sound waves to detect liquid levels. Audio waves from 20 to 200 kHz are produced to detect liquid levels especially sticky liquids or bulky material. They are compact and user friendly. Chemical processing industries, food and beverage industries and industries that use fine grain solids.

Capacitance Level Sensors

Capacitance level sensors are used to detect the level of liquids that are aqueous and slurries. They use electromagnetic radio waves to detect levels. They have no oscillating or moving parts and are easy to use. They require calibration. They are used in water treatment industries, chemical industries and battery manufacturing industries.

Optical Level Sensors

Optical level sensors detect liquids, the interface between two liquids that do not mix, poised materials and sediments in liquids. An IR LED casts a beam of infrared light and the transmission changes according to the measurements taken or determinations made by the sensor. Some sensors use lasers that work even when the environment is dusty to detect levels and sediments. They are used for measuring tank levels and leak detection.

Microwave Optical Sensors

These level sensors are very accurate and do not require calibration. They are expensive compared to other level sensors. They offer options for multiple outputs. They can determine liquid levels in dusty or moist environments. Microwave Optical Sensors are used where the temperatures of the system differ. They are good for high- and low-level sensing. Industries that use the sensors effectively are chemical industries, food and beverage industries, medical equipment industries and marine equipment industries.

Level sensors help to monitor and regulate liquid levels. Different types of level sensors effectively determine the level of different types of liquids. These sensors are compact and user friendly and have replaced the use of additional heavy equipment to detect the level of liquids in an industrial setting.