Underwater monitoring and communication system

  • US 5,392,771 A
  • Filed: 08/17/1992
  • Issued: 02/28/1995
  • Est. Priority Date: 10/19/1990
  • Status: Expired due to Term
First Claim
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1. A monitoring device for portable breathing apparatuses having:

  • a manometer which detects the pressure in one or more air supply pressure containers of the breathing apparatus by means of a pressure sensor and emits an electrical pressure signal which is representative of the pressure;

    a transmitter which receives the pressure signal emitted by the manometer and transmits a transmission signal corresponding to the pressure signal;

    a receiver which receives the transmission signal emitted by the transmitter;

    a display device which is coupled to the receiver and displays data as numbers or symbols which are derived at least partially from the transmission signal received by the receiver, wherein,the transmitter has a convertor device which encodes the electrical pressure signal to be transmitted by the transmitter in digital form, and a control device which automatically causes the transmission signals to be transmitted at predetermined time intervals,the transmitter has a signal generating device which generates and stores an identification signal which is characteristic of the transmitter and unambiguously identifies said transmitter,the control device causes said identification signal to be emitted at least once within each transmission interval,the receiver has a memory in which an identification comparison signal, which is assigned to that of the transmitter, is stored, and the receiver has a comparison device which tests whether the identification signal emitted by the transmitter matches the identification comparison signal stored in the receiver, andthe transmission signals received by the receiver are only passed on or further processed if the identification signal received from the transmitter and the identification comparison signal stored in the receiver are identical, wherein at least one of (1) the identification signal stored in the transmitter and (2) the identification comparison signal stored in the receiver is variable in order to match the identification signal of the transmitter and the identification comparison signal of the receiver with one another and that modification of the identification signal is always triggered by one of the transmitter and the receiver.

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