Main Categories And Working Principles Of Level Meters

Level meters can be divided into two main categories based on measurement principles: contact type and non-contact type:

Contact Level Meters (directly in contact with the liquid)
Buoyancy Type: Such as magnetic flap level meters and float level meters, using a float to rise and fall with the liquid level to drive an indicator or sensor.

Hydrostatic Type: Measures the pressure at the bottom of the liquid to calculate the liquid level height (P = ρgh).

Capacitance/Resistance Type: Electrodes or probes are immersed in the liquid, and capacitance/resistance values change with the liquid level.

Communicating Vessel Type: Such as glass tube/plate level meters, directly reading the level based on the communicating vessel principle.

Non-Contact Level Meters (no contact with the liquid):
Ultrasonic Type: Emits ultrasonic pulses and calculates distance through echo time difference (temperature compensation required).

Radar Type: Emits microwaves (such as 24GHz, 80GHz) and uses time-of-flight measurement, suitable for high temperature, high pressure, dusty and other complex conditions.

External Measurement Type: Uses sonar or vibration analysis to measure from the outside wall of the container, completely not contacting the medium, suitable for toxic, flammable, or explosive liquids.