Level Measurement Transmitter Types & Principles

A level measurement transmitter or sensor is an instrument used to determine the level of liquid or bulk solid at a particular time. The level transmitter provides an electrical output proportional to the level of a liquid, or bulk solid in a confined space.

There are two main classifications of level transmitters:
Point level transmitter and Continuous level transmitter.

Point level transmitters are designed to indicate whether the liquid has reached a specific point, while continuous levels are used to render precise liquid level measurements.

Types of level transmitters include:

1. Hydrostatic level transmitter:

Measures the hydrostatic pressure which is proportional to the measured liquid height.

2. Magnetic level transmitter:

Creates a compacting magnetic field to generate a signal corresponding to liquid level.

3. Capacitance level transmitter:

Measures the change in capacitance that occurs as the tank level changes.

4. Ultrasonic level transmitter:

Measures the time between sound energy transmitted from the sensor, to the surface of the measured material and the echo returning to the sensor.

5. Guided microwave level transmitter:

Uses the principle of Time Domain Reflectometry (TDR).

6. Radar Level transmitter:

Measures the distance by measuring the time of flight of a travelling wave.

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