Mobile device and method for monitoring a safety chain of an elevator

A mobile device for monitoring a safety chain of an elevator system, the safety chain including at least two members connected electrically in series, the mobile device comprising:

• a signal sender, a signal receiver, a timer and a processor;
• wherein when the mobile device is connected to an end of the safety chain, the signal sender selectively generates and feeds a first pulse signal into the safety chain;
• wherein the signal receiver is adapted to detect a second pulse signal coming out of the safety chain in response to the first pulse signal when the safety chain is electrically interrupted;
• wherein the timer is adapted to measure a time period between the feeding of the first pulse signal by the signal sender and the detecting of the second pulse signal by the signal receiver;
• and
• wherein the processor identifies one of the members associated with the measured time period as causing the electrical interruption of the safety chain.

A method for monitoring a safety chain of an elevator system, the safety chain including at least two members connected electrically in series, the method comprising the steps of:

• generating a first pulse signal and feeding the first pulse signal into the safety chain at an end of the safety chain;
• detecting a second pulse signal coming out of the safety chain at the end of the safety chain in response to the first pulse signal when the safety chain is electrically interrupted;
• measuring a time period between the feeding of the first pulse signal and the detecting of the second pulse signal;
• and
• identifying one of the members of the safety chain associated with the time period as causing the electrical interruption of the safety chain.