Catalog excerpts
RF Admittance Level Switch RF Admittance Level Switch Cape-11 RF Admittance Level Switch is a level measurement instrument mainly designed for powdery coal ashes, solid granules and adhesive materials. It possesses merits and benefits of other similar products in the market. Besides, Jiwei has developed innovative techniques and manufactured technologies to make Cape-11 more competitive and has higher reliability as well as stronger flexibility. In Cape-11 RF Admittance Level Switch series products, a probe is designed to detect the change of capacitance and impedance between probe and vessel wall to fulfill material level measurement and control. In its electronic unit, reactance between measurement electrode and the wall of an empty vessel constitute a balanced bridge circuit which outputs a stable oscillation signal. As medium level rises, measured medium covers measurement electrode, reactance between electrode and the wall of vessel changes. It causes imbalance of bridge circuit and stops the oscillation as a result. A post-circuit is designed to detect the change of output signal from bridge circuit and generate an alarm signal. In addition, oscillation signal at radio frequency is not only applied to the measurement electrode but also applied to a shield pole through a 1: 1 voltage-follower, so measurement electrode and shield pole have the same electric potential, phase, and frequency, but these two electrodes are insulated from each other. Even if there is medium build up on probe, because there is no electric potential difference between measurement electrode and shield pole, and the reactance change on shield pole has no effect on the detection of post-circuit. Therefore, only reactance change on measurement electrode induced by the filled medium between measurement electrode and the wall of vessel will be detected by post-circuit. It eliminates the effect of medium build up on level measurement. Jiwei has developed innovative techniques, focused on details of manufacturing process, introduced strict product process management and quality inspection to ensure Cape-11 works in super high reliability. Compared with other similar products in the market, Cape-11 series products have the following advantages: Strong flexibility, widely used for the level measurement of fly ash, solid granules and adhesive materials. With dual color LED indicator, the housing with electronics can be rotated during installation to make the orientation of LED easy for long distance observation. Modular design for high reliability, easy installation and maintenance. Strong impact resistance with a stainless-steel protective sleeve assembled. Industry leading design for high temperature endurance, process temperature can be up to 450℃. Cape-11 RF Admittance Level Switch series include 4 models (Standard, Guard, Rope and Ultra-high Temperature): Cape-11A Standard: Suitable for level measurement of dust and coal ash etc., flexible and easy for installation and maintenance. Cape-11P Guard: A stainless steel protective sleeve assembled on standard Cape-11 to enhance impact resistance of instrument for heavy materials. Cape-11R Rope: Suitable for large silos or bunkers, install vertically to effectively avoid material impact from side. Cape-11H Ultra-high Temperature: An advanced product in the field. The probe is made of high temperature ceramic, can tolerate high process temperature up to 450℃. www.jiweiauto.com Shenzhen Jiwei Automatio
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RF Admittance Level Switch Overview Cape-11A Standard RF Admittance Level Switch can measure capacitance as well as impedance between probe and vessel. It is suitable for dust and coal ashes level measurement. The probe is not susceptible to material buildup. It is flexible for various applications. Cape-11A is with modular design, easy for installation and maintenance. External LED light is ideal for long distance observation. ■ Excellent flexibility, widely used for the level measurement of fly ash, solid granules and adhesive materials. ■ With an external dual color LED indicator and...
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RF Admittance Level Switch Installation diagrams For vertical installation as Fig.1, RF Admittance Level Switch should be mounted at least 500mm apart from the vessel wall. The shield pole of RF Admittance Level Switch should protrude into the silo at least 50mm (Fig.2). For horizontal installation, mount Cape-11A approx.20°inclined to the vessel’s bottom to avoid medium buildup. To protect the probe from direct impact damage, a protection baffle should be installed above the probe body, and longer than intrusion depth (horizontal). Generally, protection baffle can be a convex shape...
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RF Admittance Level Switch Dimensional drawings Order information TC Thread G %"A TD Thread %" NPT TH Thread G 1"A TM Thread 1" NPT TE Thread G 1%"A Process fitting TF Thread 1%" NPT TG Thread G 1 /"A TN Thread 1/" NPT FA Flange DN50 PN16 FB Flange DN80 PN16 XX customized design Common length: 90 240 300 590 Shield length Or customized length (unit: mm) Intruding depth Common depth: 250 550 750 900 1000 1200 Customized depth, optional range: 250—2000 (unit: mm) Note: Shield length and Intruding depth are in three and four digits respectively in mm. For example: The shield length is 90mm,...
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RF Admittance Level Switch Overview Cape-11P Guard RF Admittance Level Switch is assembled with a stainless-steel protective sleeve on the basis of standard model to withstand the impact of heavy materials. Cape-11P is aimed to measure the level of fly ash, solid granules and adhesive materials. The design of electronic circuit can eliminate measurement error caused by material buildup or fouling on the probe and the inner wall of vessel, and effectively improve measurement accuracy and reliability. It is especially suitable for level control for dust collector and ash bunker at coal power...
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RF Admittance Level Switch ■ Ash hopper in ash conveying system at coal-fired power plant. Cape-11P is assembled with a stainless-steel protective sleeve, can effectively protect the instrument from impact damage. ■ Alumina powder silo at smelting plant and pre-chamber in CDQ (Coke Dry Quenching) unit at steel plant. ■ Raw meal silo and cement silo at cement plant. Notes: ■ For vertical installation as Fig.1, instrument should be mounted at least 500mm apart from the vessel wall. ■ The shield pole of RF Admittance Level Switch should protrude into the silo at least 50mm (Fig.2). ■ For...
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