Level transmitter is a device that senses the level of the material and converts it into an electrical signal that can be transmitted to a remote monitoring or control system. Then, the level measurement system can use this signal to accurately measure and control the level of the material in the container, and take appropriate actions as needed.
Guided Wave Radar Level Measurement
Guided-wave radar (GWR) is a method of measuring levels that involves using a probe to guide high-frequency electromagnetic waves from a transmitter to the material being measured.
This technique is based on time domain reflectometry (TDR), where a low-energy electromagnetic pulse is transmitted along the probe. When the pulse reaches the surface of the medium being measured, it is reflected up the probe and analyzed by circuitry to determine the fluid level. The sensor can provide a continuous measurement reading via an analog output, or the values can be converted into switching output signals that can be positioned freely.
Ultrasonic Level Measurement
Ultrasonic level devices determine the distance from a high-placed transmitter to the surface of a material in a process using sound waves that bounce back. These waves have a frequency beyond what humans can hear, so they are known as ultrasonic.
The time it takes for the sound pulse to travel to the surface and return determines the distance, which is then translated into the process level by the transmitter’s electronics. These devices can provide output signals for either the amount of material in the vessel (fillage) or the remaining empty space at the top of the vessel (ullage).