Hi Expert How To Do This Question A And B 1 (118.49 KiB) Viewed 132 times
Hi Expert How To Do This Question A And B 2 (229.23 KiB) Viewed 132 times
Figure Q1 shows a temperature measurement circuit using an RTD. The opamp, A1 pumps a constant current, I, through the RTD. The voltage across the RTD is measured and translated into temperature reading. The parameters of the RTD are: R(T) = 1 kN at 0 °C, do = 0.00385 l°C and dissipation constant, Pp of 30 m WPC. The diode D1 is a silicon diode with a forward junction voltage of 0.7 V. The RTD is used for monitoring the water temperature in a tank from freezing point to boiling point. = а 10V RI 10k A1 RTD D1 R2 Figure Q1
(a) The temperature rise due to self-heating of the RTD has to be below 0.05 °C to reduce the error in the temperature/voltage reading. Determine the suitable value for the current, I, and the value of the resistor, R2. (b) Design the signal conditioning circuit so that the temperature measured by the RTD is translated linearly in which, at 0 °C, the output voltage is 0 V; and at 100 °C, the output voltage is 1.0 V. The temperature rise due self-heating of the RTD can be neglected in your calculations. Use opamps in designing the signal conditioning circuit. The signal conditioning circuit should not load the RTD and opamp A1. Sketch and label the complete circuit clearly.
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