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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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