• 详细信息

    1.0 Introduction
       1.1 System Description
    Radio frequency admittance level controller(controller for short as following)is a level control instrument designed and produced based on adopting international advanced technology and function of same kind products. It is composed of sensing probe, electronic control unit, and protection enclosureadopted tri-terminal coce-shield techniquecompletely eliminating the error action cause of material coating, temperature, pressure, media, etc. and increasing the stability of product. It may be widely applied in the field of metallurgy, chemical, petroleum, power, foodstuff, paper, coal, construction material, medication etc. for level, liquid level control and alarmand it may implement automatic control and automatic detecting of production process using with PLC programmable controller or DCS system.
       1.2 Theory of Operation
    DE serial RF admittance controller employs radio frequency admittance technique, controller is composed of two parts electronic circuitry and probeelectronic circuitry includes high-frequency vibrator, test circuitry, output circuit,  probe consists of a probe pole and a coverbetween both of them and between them and grounding vessel are insulation one anotherthe stable RF voltage is provided by high-frequency vibrator sent to the detecting pole, when the level touches detecting poleoutputs an unbalance voltage to drive relay action disposed by demodulator and amplifier.
    2.0 Specification
    2.1 Electronic Unit
       1PowerAlternative current 185-260V AC 2W
                    Direct current      15V-30V DC 2W
       2Signal Outputoutput of relay contacts
                    Capacity of ContactsAC 220V 5A; DC 24V 3A
     
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