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Linear integrated sensing transmitter sensor

  • US 5,741,074 A
  • Filed: 06/06/1995
  • Issued: 04/21/1998
  • Est. Priority Date: 06/06/1995
  • Status: Expired due to Fees
First Claim
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1. A temperature sensor for measuring and reporting temperature, comprising:

  • an elongated tubular housing having a tip portion with a sealed end and a transition portion with a sealed end, said housing having an elongated cavity therethrough;

    a resistance temperature detector contained within said tip portion of said housing said resistance temperature detector having a resistance value which increases with increasing temperature;

    an elongated circuit board contained within said transition portion of said housing, said circuit board comprising a transmitter means for providing a current which is a linear function of the temperature sensed by said resistance temperature detector, said transmitter means including;

    excitation current means connected to said resistance temperature detector at a common junction for exhibiting an electrical characteristic in response thereto;

    converter means connected to said excitation current means and to said resistance temperature detector at said common junction for detecting a voltage at said common junction, said voltage at said common junction varying as the electrical characteristic of said resistance temperature detector varies, said converter means converting said voltage to a current;

    feedback means for connecting said converter means to said common junction and having a feedback current flowing therethrough, said feedback means being responsive to said current at the output of said converter means for adjusting said feedback current so as to adjust the voltage at said common junction and said excitation current applied to said resistance temperature detector, thereby maintaining across said resistance temperature detector a voltage which is a linear function of a condition sensed by said resistance temperature detector; and

    power supply means having a first terminal connected to said excitation current means and a second terminal connected to said resistance temperature detector for supplying power thereto.

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