Radar liquid level transmitters for liquid level measurement. As the name suggests, these liquid level transmitters use radar technology for liquid level detection. These transmitters operate based on electromagnetic waves in the 10 GHz range at the microwave X-band bandwidth. Due to the non-contact level measurement, these level transmitters have found their place in industries such as mining, boiler technology, papermaking and pulp industry. How do these transmitters work and why are they important in various industries?
Solid state oscillator:
The solid-state oscillator is used as an electromagnetic signal transmitter. The solid-state oscillator emits electromagnetic waves in the direction of the fluid surface to measure the depth or level of the fluid without any physical contact.
The radar antenna in this system is used as a transducer between the empty space in the fluid container and the electromagnetic signal source or receiver. The antenna receives the process signal and transmits it to the receiver.
Receiver and signal processor system:
The receiver is a hardware microprocessor, which converts the received signal into a reading. The signal processor converts computer data into digital readings.
The working principle of radar type level transmitter is the function of time domain reflectometer (TDR). This is also known as the principle of time-of-flight (TOF) radar measurement. Since these transmitters themselves are used as level sensors, it can be said that electromagnetic signals are sent from the sensors. The solid-state oscillator installed in the radar level sensor set oscillates electromagnetic waves to the surface of the fluid. The distance can be measured using the oscillator as a reference point and the fluid surface as a target. Once the electromagnetic wave hits the surface of the fluid, the surface itself will reflect the pulsation signal to the radar antenna. The antenna sends the signal to the receiver. When the receiver collects the signal reflected by the return pulse, the time required for the reflection is calculated. The calculation of the level time is performed by the signal processor. Once the signal processor converts the reflection time into the travel distance according to the time domain reflectometry, the distance is the depth of the fluid.
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