For some industrial factories, some equipment must be used. For example, many factories now use cable waveguide radar level gauges. What are the characteristics of cable waveguide radar level gauges? What is the measuring principle?Cable waveguide radar level gaugeThe intelligent cable waveguide radar level gauge is a radar level gauge based on the principle of time domain reflection. The electromagnetic pulse of the radar level gauge propagates along the wire rope or probe at the speed of light. When it encounters the surface of the measured medium, the radar level gauge Part of the pulse is reflected and becomes an echo. The distance between the same transmitting device and the surface of the measured medium is proportional to the propagation time of the pulse, and the liquid level is calculated.Cable waveguide radar level gaugeFeatures of cable waveguide radar level gaugeIt can measure any medium with a dielectric constant above 1.4. It is generally used for the measurement of media with a viscosity of 500 cst and difficult to adhere to. The range of the rod radar can reach 6 meters. It has a strong ability to inhibit steam and foam, and does not affect the measurement. The double probe type measurement method is adopted for liquid materials with small dielectric constant, which can ensure good and accurate measurement accuracy.
Measuring principle1) The product is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components. The detector sends out high-frequency pulses and propagates along the cable. The pulses are reflected when they hit the surface of the material and are received by the receiver in the instrument, which converts the distance signal into a level signal.2) Input) The reflected pulse signal is transmitted to the electronic circuit part of the instrument along the cable, and the microprocessor processes the signal to identify the echo generated by the microwave pulse on the surface of the material. The correct echo signal identification is performed by intelligent software. The distance d from the surface of the material is proportional to the time travel t of the pulse: D=CT/2 where c is the speed of light, and the distance e of the empty tank is known, so the level is l For: L=ED.3. Output: empty tank height e (=zero point), full tank height f )=full scale) and some application parameters for input setting, the application parameters automatically adapt the meter to the measurement environment. Support 4-20mA output.Cable waveguide radar level gaugeInstallation location of intelligent cable waveguide radar level gaugeKeep away from the discharge port and supply port as much as possible. Regarding metal cans and plastic cans, the entire microwave oven does not touch the wall. In the case of metal tanks, do not install the level gauge in the center of the tank. It is recommended to install at 1/4 of the diameter of the silo. The distance between the cable probe or the rod probe and the tank wall is more than 30cm. The bottom of the detector is about 30 mm from the bottom of the tank. The distance between the detector and the obstacle in the fuel tank is more than 200mm. When the bottom of the container is tapered, the sensor can be installed in the upper center of the tank and can measure to the bottom of the tank.Cable waveguide radar level gauge is one of the common equipment in industry, we need a lot of knowledge. You can directly consult and understand on the website such as Huikeda Instruments.
Post time: 21-09-21