What type of level sensor has a pressure transducer connected to contained air via a tube?

A diaphragm element type of level sensor operates by using a pressure transducer that is connected to a gas, typically air, contained in a tube. This design allows the sensor to measure the pressure exerted by the liquid column above the sensor, with the pressure transducer converting the pressure reading into an electrical signal that correlates to the level of the liquid.

The mechanism relies on the principle that as the level of the liquid changes, the pressure exerted on the diaphragm changes correspondingly. This setup is particularly beneficial in applications where non-contact measurement is essential or where contact with the liquid could damage the sensor or affect its accuracy.

In contrast, other types of level sensors function based on different principles: hydrostatic level sensors measure the pressure directly from the liquid column rather than using contained air; radar level sensors utilize microwave radar waves to determine level; and magnetostrictive sensors rely on magnetic fields to provide precise measurements. Each type of sensor serves distinct purposes and is chosen based on the application requirements, such as the physical properties of the liquid being measured, the environmental conditions, and the required accuracy.