# IRWIN 9e 4_54 - Irwin Basic Engineering Circuit Analysis...

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Unformatted text preview: Irwin, Basic Engineering Circuit Analysis, 9/E 1 4.54 An industrial plant has a requirement for a circuit that uses as input the temperature of a vessel and outputs a voltage pro- portional to the vessel’s temperature. The vessel’s temperature ranges from 0°C to 500°C, and the corresponding output of the circuit should range from 0 to 12 V. A RTD (resistive thermal device), which is a linear device whose resistance changes with temperature according to the plot in Fig. P4j4a, is available. The problem then is to use this RTD to design a circuit that employs this device as an input and produces a O- to lZ—V signal at the output, where O V corresponds to 0°C and 12V corresponds to 500°C. An engineer familiar with this problem suggests the use of the circuit shown in Fig. P4.54b in which the RTD bridge circuit provides the input to a standard instrumentation ampliﬁer. Determine the component val— ues in this network needed to satisfy the design requirements. 500 400 Resistance in ohms 200 100 100 200 300 400 500 Temperaturehqo (b) Figure P454 (a) SOLUTION: Chapter 4: Operational Amplifiers Problem 4.54 Irwin, Basic Engineering Circuit Analysis, 9/E (lL’ V\>R : V'R‘ R‘lb (Em EfﬁgyI g. ILRRTD Rl‘l RKTD _____________________________—___——————————————————- Problem 4.54 Chapter 4: Operational Amplifiers Inuin, Basic Engineering Circuit Analysis, 9/E 3 \IQ’V : V|-VL + \l—V, < K6: RH) Q5 RH “‘1 KCLOJ v1 (Qs’RHWOdL) Chapter 4: Operational Amplifiers Problem 4.54 4 Inlvin, Basic Engineering Circuit Analysis, 9/E V0:— 24" ’DOTT ‘_,l(.‘L [1+ 19:- lDquT R4 _____________________________———————-— Problem 4.54 Chapter 4: Operational Amplifiers ...
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