Rf Admittance Level Switch By Shanghai Aead Technology Co. Ltd.

RF Admittance Level Switch is composed of two parts: Detection and transmitting. The detection part is composed of probe, protective casing and sensor. The transmitting part is composed of oscillator, demodulator, amplifier, voltage and electricity conversion, dial gauge and outer casing. The oscillator generates 100KHz radio-frequency voltage, which will be applied on an electrical bridge composed of inductor and capacitance and used to compensate the distributed capacitance on coaxial-cable. It is the capacitance formed between the sensor and the material to be measured. On the initial stage, change the variable capacitance to balance the electric bridge, the voltage transmitted to demodulator will be zero. When the material level within the container rises, the capacity will increase and the electrical bridge will lose balance, then the voltage transmitted to the demodulator will not be zero, which will be in direct proportion to unbalancedness of electrical bridge. The material level changes will give rise to signal variations, after processing of demodulator and amplifier, it will be changed to 4~20mADC linear current to the measured material level, which will be transmitted to control room for centralized control and record, achieving the automatic control of technological process.