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Fluid temperature compensator circuit for a thermal gauge probe

  • US 4,220,039 A
  • Filed: 07/31/1979
  • Issued: 09/02/1980
  • Est. Priority Date: 07/31/1979
  • Status: Expired due to Term
First Claim
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1. In combination witha tubular thermal gauge probe having a heater connected with a source of electrical energy and disposed within one fluid entering closed end portion and having a first thermocouple disposed within the heater,a second thermocouple within said probe and connected in series with said first thermocouple in thermally insulated relation, one lead of said first thermocouple and one lead of said second thermocouple extending beyond the other end of said probe, the improvement comprising:

  • amplifying means connected with the source of electrical energy and said one lead of said first thermocouple;

    voltage divider means including a resistance thermal device interposed between said second thermocouple and said amplifying means for applying a constant value correctional voltage to said amplifying means as a function of fluid temperature; and

    ,voltage regulator means including a voltage regulator connecting the source of electrical energy with said heater, said one lead of said second thermocouple and said voltage divider means.

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