80G Radar Level Meter Continuous Frequency Modulation Wave Ultrasonic Level Measurement

80G FM Radar Level Meter

Measuring principle
A radar signal is emitted via an antenna, reflected from the product surface and received after a time t. The radar principle used is FMCW (Frequency Modulated Continuous Wave).
The FMCW-radar transmits a high frequency signal whose frequency increases linearly during the measurement phase (called the frequency sweep). The signal is emitted, reflected on the measuring surface and received with a time delay, t. Delay time, t=2d/c, where d is the distance to the product surface and c is the speed of light in the gas above the product.
For further signal processing the difference Δf is calculated from the actual transmitted frequency and the received frequency. The difference is directly proportional to the distance.
A large frequency difference corresponds to a large distance and vice versa. The frequency difference Δf is transformed via a Fast Fourier Transform (FFT) into a frequency spectrum and then the distance is calculated from the spectrum. The level results from the difference between the tank height and the measured distance.

1. Transmitter
2. Mixer
3. Antenna
4. Distance to product surface, where change in frequency is proportional to distance
5. Differential time delay, Δt
6. Differential frequency, Δf
7. Frequency transmitted
8. Frequency received
9. Frequency
10. Time

Radar – The Advantages at a Glance
Little or no maintenance

–Non-contact

–No moving parts

–No recalibration
Use in many installations

–Unaffected by the process conditions

–High accuracy

–Long measuring range 100 m

–High pressure (> 2000 psi)

–High temperatures (>800 °F)

–High reliability (SIL 2 & 3)

Technical parameter

Product Size (unit: mm)

Field application