An industrial plant has a requirement for a circuit that uses as input the temperature of a vessel and outputs a voltage proportional to be vessel?s temperature. The vessel?s temperature ranges from 0^oC to 5000^oC, and the corresponding output of the circuit should range from 0 to 12V. A RTD (resistive thermal device), which is a linear device whose resistance changes with temperature according to the plot in figure, is available. The problem then is to use this RTD to design a circuit that employs this device as an input and produces a 0-to 12-V signal at the output, where 0 V corresponds to 0oC and 12V corresponds to 500oC. An engineer familiar with this problem suggests the use of the circuit shown in figure b uses in this network needed to satisfy the design requirements.

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24 V Vo (0-12V) 600 Ta R1 500 400 +) 12 V 24 V RA RG 300 R3 RTD ER4 200 100 Rs 100 200 300 400 500 (b) Temperature in °c (a) Resistance in ohms