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Security device for monitoring integrity of closed objects

  • US 8,339,263 B2
  • Filed: 03/23/2007
  • Issued: 12/25/2012
  • Est. Priority Date: 03/29/2006
  • Status: Active Grant
First Claim
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1. A security device for monitoring changes in conditions of a closed object, the device comprisingat least one sensor arranged to sense changes in conditions of the closed object in successive time points and arranged to produce an alarm signal upon occurrence of such detected changes exceeding a specified limit value,an indication unit communicating with the sensor, said indication unit comprising at least a transmitter arranged to indicate outside the closed object a presence of said alarm signal by transmitting said alarm signal, whereinsaid at least one sensor is arranged to switch off said indication unit before indicating the presence of said alarm signal if the changes detected comply with a certain reference condition.

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