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KJT limit switch does not require trenching and wiring, which greatly reduces cable, labor costs and project cycles; simplifies engineering design and reduces the workload of designers (especially the direction of cables); cables cannot be laid arbitrarily due to natural terrain such as bridges, rivers, and mountains; a private data collection network can be quickly established according to the increase in detection points, and expansion is flexible and convenient; when a fault occurs, the detection points are relatively concentrated, eliminating the tedious tasks encountered in previous inspections along the line.