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RF Admittance Level Switch is a common level measurement switch with wide application, mainly used for the level measurement of plastic, feed, grain, rubber, medicine, sand, food, cement, paint, clothing, pulp and other materials. When it comes to RF Admittance level switch, many people will question: What is the difference between RF Admittance level switch and radar level meter?
First, the working principle of the two is different
1, radar level meter is based on the principle of time domain reflection (TDR: Time Domain Reflectometry), the microwave pulse from the end of the antenna to transmit out. When the emitted pulse touches the surface of the measured medium, part of the energy is reflected back and received by the same antenna. Through the principle of time extension technology, the distance between the transmitting device and the surface of the measured medium is proportional to the propagation time of the pulse in between, and the time interval between the transmitting and receiving pulses is calculated, so as to further deduce the distance from the antenna to the surface of the measured medium.
2、The working principle of RF conductivity level switch is to realize level measurement and control by sensing the change of electrical resistance (capacitive resistance and impedance) between the probe and the tank body. Its internal electronic unit, from the probe measuring pole and the no-load tank reactance together to form a balanced bridge circuit and generate a stable oscillation signal. When the measured medium covers the probe measurement pole, it causes the reactance between the probe measurement pole and the tank to change, resulting in the bridge circuit being unbalanced and stopping the oscillation signal, which is detected by the back-end circuit to output an alarm signal.
The oscillation signal as RF signal applied to the probe measuring pole at the same time, but also after 1:1 voltage follower sent to the probe's protection pole, measuring pole and protection pole RF signal with equal potential, the same phase, the same frequency and isolated from each other. When the probe has hanging material, there is no potential difference between the measuring pole and the protection pole to form electrical isolation to ensure that the signal change of the protection pole does not affect the detection, so that the change of reactance on the probe measuring pole can only be determined by the material between the probe measuring pole and the tank, so that the hanging material on the probe will not affect the normal detection.
Second, the technical advantages of the two are different
1, the technical advantages of radar level meter.
Radar level meter for liquid, particles and slurry continuous level measurement, measurement is not affected by media changes, temperature changes, inert gas and steam, dust, foam, etc.. The highest accuracy of the radar level meter is 3MM, the maximum range of 100 meters, the highest temperature resistance of 250 degrees, the highest pressure resistance of 40 bar.
2、Technical advantages of RF Admittance Switch.
Due to the use of a series of innovative design and advanced technology, the count for the radio frequency conductivity switch has a unique advantage.
(1) strong applicability: in the measurement of fly ash, solid particles, adhesive materials have a wide range of applications.
2）Easy to use: external two-color LED indicator, rotatable head design can realize the best orientation of LED, convenient for remote observation.
(3) High reliability: the product has passed the third-party reliability testing certification, high sensitivity, strong resistance to hanging material, with high reliability and stability; modular design, easy installation and maintenance.
(4) Strong impact resistance: the probe comes with a stainless steel protection sleeve outside, with strong impact resistance, which can effectively reduce the damage to the probe caused by material impact.
5) High temperature resistant design: the process temperature can reach up to 450℃, industry leading.
Third, the application occasions of the two are different
1, radar level meter meter is suitable for building materials, chemical industry, water conservancy, electric power, environmental protection, cement, food, medicine and other industries, for the measurement of liquid media such as water, industrial wastewater, hydrochloric acid, nitric acid, sulfuric acid, acid and alkaline liquids, cement slurry, lime slurry and various food slurry and various solid media such as chemical raw materials, construction materials, alumina, ore, limestone, coal carbon, cement, grain, etc..
2, RF conductor switch is widely used, measuring materials mainly fly ash, solid particles, liquid, adhesive materials, mainly used in metallurgy, environmental protection, chemical industry, electric power, cement and other industries of large tanks and silo measurement, especially suitable for power plant dust collector ash level control, ash storage level and other control.
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