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Intrinsic Safety Explosion-proof Junction Box GMA-JB4-Ex

GMA-JB4-Ex is an intrinsic safety explosion-proof junction box that supports connections for 4 analog or digital load cells in 4-wire. By adjusting the resistance value of the potentiometer, it compensates for angle deviations, effectively resolving inaccurate weight results caused by angle differences in weighing applications. Stainless steel housing with 5 explosion-proof cable glands (BDM-II G1/2)(Ex Marking: Ex db llC Gb, IP Rating: IP66), applicable cable outer diameter: φ5-12mm, delivers enhanced protection and superior anti-interference performance. Certified for intrinsic safety explosion-proof standards, it is ideal for deployment in hazardous environments.


Ex marking: Ex ia llC T4 GaI

IP Rating:lP65

ENQUIRE
  • Highly Integrated

    Highly Integrated

  • CE Approve

    CE Approve

  • Anti-Explosion

    Anti-Explosion

PRODUCT ENQUIRE


Four-wire Connection Method

  1. Internal wire terminals are identified as: 

      "+E"-- EXCITATION +

       "-E" -- EXCITATION -

       "+S"-- SIGNAL +

       "-S"-- SIGNAL -

       "GND"-- SHIELD

  2. When the load cell is six-wire, short-circuit the +excitation and +sense to EX+, short-circuit the -excitation and -sense to EX-. 

            

Adjustment Method

  1. Precision potentiometers W1~W4 can fine-tune the output signal of each load cell, which is used to adjust the four-angle deviation of the system.

 

Four-Angle Deviation Adjustment Method

  1.  Before adjustment, the four-channel potentiometer is gently rotated to the middle position;

  2.  Fine-tune the channel with a large deviation to the average value (close the other three channels when observing one channel);

  3.  Repeat step 2 until the millivolt signals of the four-channel are similar.

 

 

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