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RF Admittance Level Switch

The design of Cape-11 RF Admittance Level Switch is based on absorbing excellent designs and techniques from pioneers, while combining with Jiwei’s independent innovative technology and processes,making Jiwei products perfect enough to rival international famous brands. Cape-11 has high reliability and strong versatility, it is used to detect the level of fly ash, solid granular and adhesive materials. 


Cape-11 RF Admittance Level Switch series use probe to sense the change of capacitive reactance and impedance between the probe and the vessel while detecting the material level. Within the electronic unit, the measurement electrode and the reactance of empty vessel together form a balanced bridge circuit and generate a stable oscillation signal. When the level rises and measured medium covers the measurement electrode, the reactance between measurement electrode and vessel wall changes, which causes imbalance of the bridge circuit, and stops generating the oscillation signal. This change will be detected by the post-circuit, and then output an alarm signal. Meanwhile, the oscillation signal works as a radio frequency signal that is applied to measurement electrode but also goes through the 1: 1 voltage-follower and then sends to shield pole. The RF signals of measurement electrode and shield pole have the same electric potential, phase, and frequency, but they are isolated and independent to each other. When a material adhere to the probe, there is no electric potential difference between measurement electrode and shield pole, so the form of electrical isolation ensures the signal change of shield pole has no effect on the detection, thus the reactance change of measurement electrode can only decided by the measured material between measurement electrode and vessel, which make hanging of the probe has no effect on the detection.


In development, Cape-11 Admittance Level Switch series absorb the advantages of similar products from other international rival brands and combine Jiwei’s independent innovative technology and testing standards together. We believe details determine the quality; so we strictly control the production processes and quality inspections to ensure Jiwei products have superior quality and reliability. Comparing to the rival brands’ products, Cape-11 Admittance Level Switch series have the following advantages: 

● Strong versatility, it can be widely used in the measurement of fly ash, solid granular and adhesive materials.

● Has external dual color LED indicator, by rotating the header relatively to the process fitting makes LED indicator convenient for remote observation.

 Modular design with high reliability. Easy installation, no calibration required.

● Passed through reliable tests and received certifications by the third party.

● Has strong impact resistance, outer layer is covered with stainless steel protective tube.

● Process temperature can reach up to 250℃, which is industry-leading.


Cape-11 RF Admittance Level Switch series include four models: Standard Type, Guard Type, Rope Type and Ultra-high Temperature Type: 


Cape-11A Standard Type:
Suitable to measure dust, coal ash and so on. Has strong versatility, the installation and maintenance are simple. 


Cape-11P Guard Type: 
Based on the same techniques as the Standard Type, Cape-11P has an extra stainless steel protective tube, which is able to minimize the impact of heavy materials. 


Cape-11R Rope Type:
Suitable to measure large tanks and silos. Vertical installation, effectively avoid side impact of coarse material. 


Cape-11H Ultra-high Temperature Type: 
The probe uses high temperature ceramic material, process temperature can reach up to 450℃, which is industry-leading. 

  • Cape-11A Standard Type
    Cape-11A Standard Type

    ● Excellent versatility, it can be widely used in the measurement of fly ash, solid granular and adhesive materials.

    ● Has external dual color LED indicator, by rotating the header relatively to the process fitting makes LED indicator convenient for remote observation.

    ● Modular design with high reliability. Easy installation, no calibration required.

    ● Passed through reliable tests and received certifications by the third party.

    ● Superior quality but cheaper price.


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  • Cape-11P Guard Type
    Cape-11P Guard Type

     Cape-11P has an external stainless steel protective tube to minimize the impact of heavy materials. 

     Heavy ash hopper in ash conveying system at power plant   

     Alumina powder silo and CDQ (Coke Dry Quenching) charge warehouse at smelting plant 

     Raw materials warehouse and cement silo at cement plant



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  • Cape-11R Rope Type
    Cape-11R Rope Type

    The lowest measurable dielectric constant is 1.6, and the process temperature is up to 250 ℃, It is typically applied in level measurements with large range, such as:

     Coal bunker at power plant

     Cement silo at cement plant


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  • Cape-11H Ultra-high Temperature Type
    Cape-11H Ultra-high Temperature Type

    The lowest measurable dielectric constant is 1.6, and the process temperature reaches up to 450 ℃. It is typically applied in level control with the working temperature up to 450 ℃, such as:

     Hoppers of Coal economizer at power plant

     Sintered ash silo at smelting plant

    ● Level control of cement material in grate cooler at cement plant

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