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 station.
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 buildup 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 buildup on level measurement.
● Assembled with a stainless-steel protective sleeve, strong impact resistance.
● Widely used in level measurement for coal fly ash, solid granules and adhesive materials, particularly suitable for level control of fly ashes in dust collector and ash bunker at power station.
● With an external dual color LED indicator and housing with electronics can be rotated during installation to make orientation of the LED convenient for long distance observation.
● Modular design for high reliability, easy installation and maintenance.
● Passed third party reliability tests and received certifications from the third party, guaranteed extremely high reliability.
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Medium
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Medium type
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Heavy solid powder, granules, adhesive materials
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Dielectric constant
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≥1.6
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Probe data
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Probe length
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750～2000mm
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Shield length
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90mm/240mm/300mm /590mm, or customize
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Protective sleeve length
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For probe length 750～1200mm：210mm/370mm
For probe length＞1200mm
: customize
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Probe diameter
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Φ10mm
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Materials
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External Housing
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Aluminum alloy
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Inner housing
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Plastic
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Probe metallic parts
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SUS304
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Probe insulation
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PTFE
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Protective sleeve
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SUS304
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Power supply
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AC
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85～264V AC
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DC
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18～30V DC
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Power consumption
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≤3W
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Switch delay
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When immersed
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1s
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When laid bare
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1s
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Signal output
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Relay
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DPDT, 8A/250V AC/30V DC
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Delay
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0～30s continuous adjustable.
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Operating conditions
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Process temperature
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-40～250℃
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Ambient temperature
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-40～70℃
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Storage and transport temperature
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-40～80℃
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Approvals
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Protection rating
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IP66
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● 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.
For more information, please Contact：sales@jiweimeter.com
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