Working principle: this system is based on the principle that the bottom of the elevator moving car changes elasticity according to the load, and detects its displacement changes through the Hall sensor, so as to realize the elevator car overload detection method.Main features: 1. Non-contact inductive working mode, no mechanical movement itself, directly installed in the elevator original overload switch, without changing the elevator car structure;2. High strength induction magnet is used to maximize the anti-interference ability of the system;3. Electrical performance in accordance with the "International Electrotechnical Commission (IEC)" standard requirements;High positioning accuracy, small volume, easy installation and debugging.Simple structure and low price.