Liquid level sensors are mostly used for detecting interfaces or liquid levels between liquids like water and oil or solid and liquids. These sensors can be defined as a transducer, sensor, or an integrated system with control and instrumentation capabilities.
Depending on the application, you can choose between point level and continuous sensing. The point level sensors usually turn off the system or trigger an alarm depending on a specific limit. There are some applications that depend upon continuous liquid level monitoring. It can use different methods including vibration, ultrasound and pressure for continuous liquid level monitoring.
Different types of liquid level sensors
The differential and pressure membrane liquid level sensors determine the pressure or changes in pressure in a vessel like a storage or holding tank. There are sonic / ultrasonic liquid level sensors that determine the length of time taken for a reflected sound wave to return back to the transducer.
Tuning / vibrating fork liquid level sensors utilise a piezoelectric crystal or other type of technology for vibrating a probe. They also continuously monitor the absence, presence, decrease or increase of that vibration.
In some applications, it is essential to determine the liquid level without having any direct contact with the media. Applications that include highly corrosive liquid use non-contact meter technologies like sonic / ultrasonic liquid level sensors or/and microwave / radar liquid level sensors may be the most favourable options.
When it comes to choosing ultrasonic liquid level sensors, you need to consider the temperature, surface properties and media types.
