Measurement principle
Lead wave radar is based on the principle of time travel measurement instruments, radar wave speed, operation time can through the electronic
Components are converted to level signal. Probe a high frequency pulse and along the cable transmission, when pulse meet material surface reflection
Come back is instrument in the receiver receive, and will distance signal into level signal.
input
The reflection of the pulse signal along the cable transmission to instrument electronic circuit part, microprocessor to signal processing, the identify microwave pulse in the material surface produced by the echo. Correct echo
Signal recognition by intelligent software, distance material surface distance D and pulse time stroke T is proportional to the:
D = C × T / 2
The C for the speed of light
Because the distance of empty cans E known, the level L for:
L = E - D
output
Through the input air tank height E (= zero), full tank height F (= full scale) and some application parameters to set, application parameters will automatically make instrument to adapt to the measurement environment. Corresponding to the four - 20 ma output.