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Multi-wire mineral insulated cable thermocouple reference junction

  • US 4,624,582 A
  • Filed: 02/29/1984
  • Issued: 11/25/1986
  • Est. Priority Date: 02/29/1984
  • Status: Expired due to Fees
First Claim
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1. Cable means for making a transition from leads of a temperature measuring means to extension wires that conduct a signal indicative of the temperature measured by the temperature measuring means to signal processing electronics, comprising:

  • (a) a cable sheath;

    (b) a low resistance, electrically conductive liner means disposed coaxially within the sheath for defining a shielded region within the interior of the liner means and for shielding the interior region from electromagnetic radiation;

    (c) a pair of leads extending from a temperature measuring means to within the shielded region within the interior of the liner means;

    (d) a pair of extension wires extending from within the shielded region within the interior of the liner means to signal processing electronics;

    (e) a plurality of intermediate junctions disposed in the shielded region and formed at the juncture of the leads of the temperature measuring means and the extension wires;

    (f) thermally conductive, electrically insulating means for filling the shielded region at least through the region of the intermediate junctions and for conducting thermal energy from the conductive liner means throughout the thermally conductive, electrically insulating means in the region of the intermediate junctions such that no temperature gradient exists across the radius of the liner means; and

    (g) a compensating temperature measuring means having leads, the compensating temperature measuring means disposed within the sheath in the region of the intermediate junctions for measuring the temperature of the intermediate junctions and for generating a signal indicative of the temperature of the intermediate junctions, said signal impressed on the leads thereof, whereby the signal indicative of the temperature of the intermediate junctions generated by the compensating temperature means is available to compensate a signal indicative of the temperature measured by the temperature measuring means as conducted on the extension wires due to the thermoelectric effect of the intermediate junctions.

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