US 4,483,631 A · Multiple thermocouple system for high temperature reactors

Abstract

A multiple thermocouple system for rapidly monitoring wall temperatures of a metal vessel and identifying those thermocouples having voltages and temperature readings above a predetermined level. In the system, a number of first metal insulated conductor wires are metal bonded to the metal vessel to provide hot first junctions, and a second conductor utilizes the vessel metal wall as a portion of the conductor together with an additional metal insulated conductor wire connected to the metal wall. The conductors of each thermocouple pair are connected to the terminals of a rapid switching device and subsequently connected by the switching device to a voltage measuring means, which can be a digital readout type millivoltmeter. If desired, the voltage output of each thermocouple pair can be compared by a computer with the voltage output from a conventional dual conductor reference thermocouple attached to the vessel wall to determine temperature deviations. Also, the voltage readout for those thermocouples showing temperature deviations exceeding a predetermined amount can be conveniently displayed on a cathode ray tube screen.

Claims12

Dependent claims

A thermocouple system for rapidly monitoring wall temperatures of a metal vessel, comprising:

(a) a thermocouple metal conductor wire attached at one end of a first junction point on a metal vessel and attached at the other end to a switching device arranged to connect said conductor wire to a voltage measuring means said first conductor wire being composed of a metal different from that of said vessel;
and
(b) a second thermocouple conductor wire spaced from said first thermocouple conductor wire and composed of a metal similar to that of said vessel and attached at one end to a second junction point on said vessel and attached at the other end to a common terminal of said switching device, said voltage measuring means being connected to said switching means sequentially for indicating a small electrical voltage generated in each thermocouple conductor pair consisting of said first conductor wire and said second conductor wire to indicate a voltage difference and corresponding wall temperature at said first junction point and means for processing said small electrical voltage indicated and for comparing said voltage with another voltage generated from a reference thermocouple means attached to a point on said metal vessel where the temperature is stable.

Dependencies are inferred from the claim text.

Multiple thermocouple system for high temperature reactors

Life of this patent

Multiple thermocouple system for high temperature reactors

Life of this patent

Abstract

Claims12