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Magnetic Level Indicator

Flap-11 Magnetic Level Indicator series products are designed based on communicating tube and the principles of magnetic coupling function to achieve real-time level measurements. When the measured liquid’s level in the vessel changes, the magnetic float in communicating tube will go up and down, and the permanent magnet steel inside the magnetic float makes the magnetic flaps of the indicator outside the communicating tube turn by 180° which is driven by the magnetic coupling function. Usually the front and back surface of flaps are coated with two different colors respectively (normally red and white) to indicate the actual liquid level inside the vessel. When the level of vessel rises, the flaps turn from white to red, and when the level of vessel drops, the flaps turn from red to white, at the red and white junction, the actual level of vessel is indicated. According to different chemical properties of the measured medium, appropriate materials for the communicating tube should be applied. In order to achieve to the best accuracy of measurement, the magnetic float’s weight, volume and structure have to be satisfied with the density of measured liquid.


Flap-11 Magnetic Level Indicator series products absorb the advantages of similar products of other rival brands combining with Jiwei’s independent innovative technology and processes, meanwhile we have been focusing on process details; strictly control the production processes and quality inspections to ensure our products have extremely high quality and reliability. Compared to the similar products of other brands, Flap-11 Magnetic Level Indicator series products have the following advantages: 
 Indicator panel and magnetic flaps uses widened design,make visual distance and viewing angle increase greatly, the ruler and its figures are bolder and clearer.  
 Unique design of end cap of the indicator panels and glass adhesive sealing technology, ensure the level of ingress protection reach to IP66/67. 
 Accessory magnetic switches and transmitters have got double certifications of Explosion Proof and Intrinsically Safety. 
 Can be equipped with additional steam jacket, electric heating, thermal insulation and anti frost devices for applied to a variety of complex conditions. 


In order to adapt to measured liquids’ different density and chemical properties, Flap-11 series are divided into the following specific application models:


Flap-11S Economical Type: 

Uses 304 stainless steel material, which is economical and  practical, meets most industrial conditions and can be used in mildly corrosive liquid measurement. 


Flap-11A Standard Type: 

Made of strong anti-corrosive materials, such as 316L, is suitable  for most corrosive medium. 


Flap-11P Lined Type: 

Uses 304 stainless steel with PTFE-lined, can be applied to strong corrosive liquid. 


Flap-11C Plastic Type: 

Made of PP/PVC, suitable for low pressure and strong corrosive liquid. 
Meanwhile, Jiwei also developed SW-11 Magnetic Switch and Reed-11 Remote Transmitters which can externally mounted on the Magnetic Level Indicator to achieve automatic control and remote control. 


SW-11 Magnetic Switch: 

Using the power reed of international famous brands as its core components, and certificated with Flameproof Enclosures and Intrinsic Safety. Explosion-proof rating: Ex d IIC T6 Gb and Exia IIC T6 Ga, this is the highest level of similar products in peer industry. Also, its ingress protection grade reaches to IP66/67. 


Reed-11 Remote Transmitter: 

Core components employ the processing chips and reed of international famous brands. The guiding tube uses 316L, improves the level of corrosion resistance and its reliability. It also got certifications of Flameproof Enclosures and Intrinsic Safety. Explosion-proof rating: Ex d IIC T6 Gb and Exia IIC T6 Ga. Also, its ingress protection grade reaches to IP66/67.


  • Flap-11A Standard Type Magnetic Level Indicator
    Flap-11A Standard Type Magnetic Level Indicator

    Made of 316L stainless steel, suitable for the level measurements of corrosive liquids, it is typically applied in fields as follow:

    Wash tank and waste water tank of Ion-exchange membrane electrolysis apparatus.

    ● Make-up tank of compound phosphate at hydrogen peroxide plant.

    ● Industrial waste water, lye tank.


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  • Flap-11S Economical Type Magnetic Level Indicator
    Flap-11S Economical Type Magnetic Level Indicator

    Cost-effective, particularly suitable for measuring slightly corrosive liquids, it is typically applied in fields as follow:

     Hydrogenated tail gas condensate receiver tank and liquid alkali evaporator of hydrogen peroxide devices in chlor-lkali Industry.

    ● Water tank at electrolysis plant.

     Level monitoring of a variety of storage tanks of industrial equipment.


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  • Flap-11P Lined Type
    Flap-11P Lined Type

    Float tube is made of 304 stainless steel lined with PTFE, mainly used to measure strong corrosive liquid. It is typically applied in fields as follow:

     Salt water tanks, lye recycling, dechlorination tower, chlorate decomposition, high purity hydrochloric acid storage tank of ionic membrane electrolyzer.

     Ammonia tank.

     The liquid level of monomer tank at PVC production plant.


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  • Flap-11C Plastic Type
    Flap-11C Plastic Type

    Float tube is made of PP/PVC, suitable for level measurements of low pressure and corrosive liquid. It is typically applied in fields as follow:

     Regeneration tank, refrigerant tank, hydrochloric acid tank, alkali tank of membrane nitrate removal equipment at caustic soda plant .

     Waste water tank at sewage treatment plant.

    ● Raw materials tank at dyeing plant.


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  • SW-11 Magnetic Switch
    SW-11 Magnetic Switch


    SW-11 Magnetic Switch is externally mounted on Magnetic Level Indicator of Flap-11 series products to achieve automatic control and remote control.

    ● Use the power reed of international famous brands, which with capacity of heavy current and long service life.

    ● The guide tube is made of 316L material, with strong corrosion resistance.

    ● Has got double certifications of Explosion Proof and Intrinsically Safety.

    ● The ingress protection grade reaches to IP66/67.


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  • Reed-11 Remote Transmitter
    Reed-11 Remote Transmitter

    Reed-11 Remote Transmitters is externally mounted on the Magnetic Level Indicator of Flap-11 series products to achieve automatic control and remote control, it sends a 4-20mA signal to achieve real-time level measurement and monitoring.

     The plastic reed of international famous brands used, has long service life.

    ● Use the chips of international famous brands to complete voltage-current converting and to achieve 4~20mA output.

     Certificated with both Flame proof Enclosures and Intrinsic Safety.

     The protection rating reaches to IP66/67.

     The guide tube is made of 316L material with strong corrosion resistance.


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