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    Explosion-proof Limit Switch

    Explosion-proof imit Switch

        Use
        BXK▢----series explosion-proof limit switch is suitable for the easily combustible and explosive environment and the place of the explosion-proof grade II B and the temperature class T4 to act as limiting instrumental equipments, controlling the industrial automated process, adjusting valve, computerized process, industrial elevator and the posture of other equipments and transporting and positioning of vertical mineral well. It is mainly suitable for the combustible and explosive places in petrochemical, mineral well, metallurgy, textile, oxygen-making equipment, military industry, nuclear electric station etc. sections. Compared to other controlling switches, this product features with a high accuracy, stable performance, moisture an corrosion resisting, high sensitivity and wide usability. It is interchangeable with the one made in Yamatake company of Japan.
        This product has been appraised by the National Instrument & Meter Explosion-Proof Safety Supervising & Inspecting Station, Shenyang Machine Tool Electric Appliance Research Institute etc. departments to conform GB3836.1-83, GB3836.2-83, GB2900.35-83, GB4013.1-85 etc. standards for low-voltage electric appliances, with the explosion-proof mark as dIIBT4.
        Configuration
        Explosion-proof limit switch consists of explosion-proof wiring box, explosion-proof micro-switch, contacting input guide rod and rotating device and is divided into the following types according to the structure of it:
        1. Mono-input type 2. Direct-contacting type 3. V-forked type 4. Telescopic type 5. Rod type
    Upon the functions of it:
        1. Sole-switch 2. Dual-switch 3. Completely opening and closing various types by leftward and rightward rotating, all are able to automatically reset.
        This switch holds not only a good explosion-proof property but also water-proof, pressing and corrosion resisting etc. advantages.
        Main Technique Data
       Technical features List1、List2
     
    List 1
    Machine Capability (time)
    Life
    Insulated
    Resistance(MΩ)
    Allowable Motion(time/minute)
    Acceptable surface temperature
    (℃)
    Allowable load-free instantaneous current(A)
    Machine
    Electric
    AC
    DC
    A:≥500 B:≥300
    A:≥30 B:≥20
    ≥50
    100
    20
    ≤130
    50
     

     
    List 2
    Type
    Voltage rating
    Current rating
    Scalar
    Rotating angle of guide rod
    AC
    DC
    AC
    DC
    Open
    Close
    Switch on
    Utmost
    BXK——系列
    220
    125
    5
    0.8
    2
    2
    10
    45
    220
    0.4

        1. The limit switch acts in an angle about 9º and the driving rod can still go on rotating by about 36º in case of surpassing the ravel, i.e. after the contact is changed rotating.
        2. The direct-contacting type limit switch has a working travel about 7-10mm.
        3. The casing’s corrosion-proof grade IP54.
        4. Moisture-heat performance alternating test 55º.
        5. See Fig. 1-7 for the form of explosion-proof limit switch.

    Explosionr esistant imit Switch
    Explosionr esistant imit Switch
        Product Mode
    List 3
    Mode
    Type
    Referrence
    Remark
    Use Temperature≤120℃
    Use Temperature≤180℃
    Use Temperature≤120℃
    Type A Each one increasing
    ¥50
    BXK□—11□
    Sole-switch-Rod type
    ¥450
    600
    750
    BXK□—12□
    Sole-switch-forked type
    ¥470
    630
    780
    BXK□—13□
    Sole-switch,Direct-contacting type
    ¥460
    620
    770
    BXK□—14□
    Sole-switch,Telescopic type
    ¥470
    620
    770
    BXK□—15□
    Sole-switch,Mono-input type
    ¥450
    600
    750
    BXK□—21□
    Dual-switch-Rod type
    ¥900
    1050
    1200
    BXK□—22□
    Dual-switch-forked type
    ¥930
    1080
    1230
    BXK□—23□
    Dual-switch,Direct-contacting type
    ¥960
    1110
    1260
    BXK□—24□
    Dual-switch,Telescopic type
    ¥1000
    1150
    1300
    BXK□—25□
    Dual-switch,Mono-input type
    ¥900
    1050
    1200

    Meanings and Type of the products
    List 4
    B X K ▢ ―
       □   □   □
       ①   ②   ③
    B、X、K □
    Explosion-proof limit switch, ▢--A or B inside of the square block means the switch’s grade
    1
    Switch Function
    1、Turn off the switch    2、Dual-switch
    2
    Leader series
    1.rod type 2. forked type 3. direct-contacting type 4. telescopic type 5. mono-input type
    3
    Norm at the wire outlet
    A.M20 × 1.5  B. Tightly-pressed type  C.PF1/2"

        Installation
        Inside of the limit switch there are screws, four with the single switch, two are normal-open, two normal-close. Six with the dual-switch, divided into two groups, three of each, one of which and one of the rest two are normal-open or normal-close.
        Temperature
       1. Ambient air pressure 80-110Kpa, ambient temperature –20~ +60, maximum RH of air 90%.
        2. The explosion grade of combustible gas in the environment no more than category II B, the self-combustible temperature no lower than class T4. Installed in a place of dangerous gas of area I or II.
        3. The maximum surface temperature of the switch’s casing should be ≤130℃

        Notice
        1. Make note clearly on both model and title of the switch.
        2. Rate voltage and rotating mode of limit switch.
        3. Connecting mode at the wire outlet.
        4. At order, make note on the temperature at use for the temperature resisting type switch.
        5. Storage: place the limit switch in a dry, corrosion-free place.



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