The Measurement Principle:
Guided wave radar is a measuring instrument based on the principle of time travel, the radar waves travel at the speed of light, and the running time can be through the electronic components are converted into level signals.
Probe a high-frequency pulse and along with the cable or rod probe propagation, when pulse meets the material surface is reflected back by the receiver instrument within the receiving and the distance signal into a signal.
Part of pulse signal reflection along with the cable or rod probe conduction to the instrument of electronic circuit, a microprocessor to signal to process, to identify the microwave pulses are generated on the material surface echo. Echo recognition is completed by the pulse software, from the material surface distance between D and T pulse is proportional to the time travel:
D=C×T/2
Where C is the speed of light
Because the air tank is a known distance E, L
L=E-D
By entering the empty tank height E (= zero), the full height of F (= full scale) and some application parameters to set parameters, application will automatically make the instrument to measure the environment. In 4 – 20mA with the corresponding output.
Measuring Range:
Explain:
H—- Measurement range
L—- The empty tank distance
B—- The top of the blind
E—-Probe into the minimum distance of the tank wall
Installation radar to meet the requirements:
1. Vertical installation, the installation port is not too small.
2. Installation location below there can not have obstacles, otherwise the cable will be mismeasured when encountering obstacles.
3. Installation location away from the inlet and outlet ports.