×

Centralized monitoring system for gas leakage

  • US 4,088,985 A
  • Filed: 08/23/1976
  • Issued: 05/09/1978
  • Est. Priority Date: 10/03/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. A centralized monitoring system for gas leakage comprising:

  • a plurality of gas leakage detectors disposed in an area, each generating an analog signal representing concentration of the gas at each sensing point, said plurality of gas leakage detectors being formed into a plurality of groups;

    a plurality of remote terminal units each connected to a corresponding one of said plurality of groups of gas leakage detectors, each said remote terminal units having a scanning analog-to-digital converter for scanning and converting the analog signals of said group of gas leakage detectors into digitally coded block data signals;

    a loop line having a pair of cables for connecting said plurality of remote terminal units in a loop; and

    a central monitoring station connected to said loop line for receiving said block data signals from each remote terminal unit together with an address code assigned to said remote terminal unit over said loop line on a time division basis in response to an instruction from the central monitoring station, said central monitoring station including a monitor unit for comparing the received block data signals with a predetermined monitoring level and for displaying the status of gas leakage.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×