Radar level meter

Working principle

Radar measurement is based on the Frequency Modulated Continuous Wave (FMCW) principle. The radar emits electromagnetic waves from the top of the tank. After the waves are reflected by the medium, they are received by the radar. The frequency difference δf between the received signal and the transmitted signal is proportional to the distance R to the medium surface:

R = C * δf / (2 * K)

where:

• C = speed of light
• δf = frequency difference
• K = frequency modulation slope

Since the speed of light C and the modulation slope K are known, by estimating the frequency difference δf, the distance R from the radar installation position to the material surface can be obtained. Then, by subtracting the empty height (the distance from the radar to the material surface) from the known total height H of the tank, the material level height is derived.

Product Features

• Non-contact measurement: the sensor does not come into direct contact with the medium, avoiding corrosion and wear caused by the medium.
• Millimeter-wave radar: measurement accuracy up to ±3 mm, minimum blind zone of 0.15 m.
• 5 GHz operating bandwidth provides higher measurement resolution and accuracy.
• Minimum antenna beam angle of 3° reduces interference from the installation environment, making installation more convenient.
• Chinese display interface with easy-to-understand menu options for faster human-machine interaction.
• Supports mobile phone Bluetooth debugging, making on-site debugging safer and more convenient.