Answer to Question #179476 in Electrical Engineering for Van

Question #179476

An industrial sensor used to measure temperature, the Rosemount 214C from Emerson, has a nominal resistance of 100 ohms at 0 𝑜C, with a temperature coefficient of resistance (alpha) equal to 3.85*10 -3 / oC. It is used to measure temperatures ranging from – 45 oC to 455 oC. An alarm is to be raised when the temperature rises above 400 oC – a red LED, with a cut-in voltage of 1.8 V is to light up to indicate this status. If the maximum current through the LED is to be 10 mA, while that through the RTD is limited to 100 A, design an appropriate circuit for this purpose, so that the output voltage will not be greater than 5 V. You are provided with + 15 V supplies and may assume that all components are ideal. 

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