Grounding monitoring device and system for work

A device for monitoring at least a grounding mechanism for an operator at a work station, said device comprising:

• two cascading interfaces, each having at least a first terminal and a second terminal, said first terminals of said cascading interfaces being connected together, said second terminals of said cascading interfaces being connected together;
• a power unit electrically connected to said first terminals of said cascading interfaces, said power unit extracting electricity from said first terminals and producing at least an appropriate direct-current voltage;
• a first interface having at least a first terminal;
• a second interface having at least a first terminal connected to said second terminals of said cascading interfaces;
• and
• a microprocessor circuit driven by said direct-current voltage and connected to said first terminal of said first interface and said first terminal of said second interface, said microprocessor circuit having at least a comparison and amplification unit, a personnel detection unit, and a microprocessor unit;
• wherein said comparison and amplification unit measures a resistance between said first terminal of said first interface and said first terminal of said second interface, and compares said resistance with a first reference resistance;
• when said resistance measured is larger than said first reference resistance, said comparison and amplification unit produces an abnormal signal;
• said personnel detection unit having a wireless energy detection mechanism capable of sensing the presence and absence of an operator in a coverage area and producing corresponding triggering signals respectively;
• said microprocessor unit activates at least one of an audio alarm and a visual alarm after receiving said abnormal signal only when said microprocessor unit has received a triggering signal specifying the presence of an operator in said coverage area and has not received a triggering signal specifying the absence of an operator in said coverage area for a period of time.