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A thermopile is constructed with chromel-alumel materials. Five junctions are maintained at 400-C and five junctions are maintained at 100-C. The output of the thermopile is connected to a potentiometer. Answer the following questions: a) Draw the equivalent circuit and indicate all the given information. b) What is the voltage induced by the potentiometer? Given: Table 8.30 Temperature, °C <-150 <-100 <-50 -25 0 25 50 75 100 150 200 300 400 500 600 800 1000 1200 1500 1750 Thermal emf in absolute millivolts for commonly used thermocouple combinations, according to ITS(90) (Reference junction of 0 C)¹ Copper vs. Constantan (T) -4.648 -3.379 -1.819 -0.940 0 0.992 2.036 3.132 4.279 6.704 9.288 14.862 20.872 Chromel vs. Constantan (E) -7.279 -5,237 -2.787 -1.432 0 1.495 3.048 4.657 6.319 9.789 13.421 21.036 28.946 37.005 45.093 61,017 76.373 Iron vs. Constantan (h -6.500 -4.633 -2.431 -1.239 () 1.277 2.585 3.918 5.269 8.010 10.779 16.327 21.848 27.393 33.102 45.494 57.953 69.553 Chromel vs. Alumel (K) -4.913 -3.554 -1.889 -0.968 0 1,000 2.023 3.059 4.096 6.138 8.139 12.209 16.397 20.644 24.906 33.275 41.276 48.838 Platinum vs. Platinum-10% Rhodium (S) -0.236 -0.127 0 0.143 0.299 0.467 0.646 1.029 1.441 2.323 3.259 4.233 5.239 7.345 9.587 11.951 15.582 18.503 Nicosil vs. Nisil (N) -1.530 <-1.222 -0.698 0 0.402 0.836 1.297 1.785 2.826 3.943 6.348 8.919 11.603 14.370 20.094 26.046 32.144

A thermopile is constructed with chromel-alumel materials. Five junctions are maintained at 400-C and five junctions are maintained at 100-C. The output of the thermopile is connected to a potentiometer. Answer the following questions: a) Draw the equivalent circuit and indicate all the given information. b) What is the voltage induced by the potentiometer? Given: Table 8.30 Temperature, °C <-150 <-100 <-50 -25 0 25 50 75 100 150 200 300 400 500 600 800 1000 1200 1500 1750 Thermal emf in absolute millivolts for commonly used thermocouple combinations, according to ITS(90) (Reference junction of 0 C)¹ Copper vs. Constantan (T) -4.648 -3.379 -1.819 -0.940 0 0.992 2.036 3.132 4.279 6.704 9.288 14.862 20.872 Chromel vs. Constantan (E) -7.279 -5,237 -2.787 -1.432 0 1.495 3.048 4.657 6.319 9.789 13.421 21.036 28.946 37.005 45.093 61,017 76.373 Iron vs. Constantan (h -6.500 -4.633 -2.431 -1.239 () 1.277 2.585 3.918 5.269 8.010 10.779 16.327 21.848 27.393 33.102 45.494 57.953 69.553 Chromel vs. Alumel (K) -4.913 -3.554 -1.889 -0.968 0 1,000 2.023 3.059 4.096 6.138 8.139 12.209 16.397 20.644 24.906 33.275 41.276 48.838 Platinum vs. Platinum-10% Rhodium (S) -0.236 -0.127 0 0.143 0.299 0.467 0.646 1.029 1.441 2.323 3.259 4.233 5.239 7.345 9.587 11.951 15.582 18.503 Nicosil vs. Nisil (N) -1.530 <-1.222 -0.698 0 0.402 0.836 1.297 1.785 2.826 3.943 6.348 8.919 11.603 14.370 20.094 26.046 32.144

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Question 5.1: A thermopile is constructed with chromel-alumel materials. Five junctions are maintained at 400-C and five junctions are maintained at 100°C. The output of the thermopile is connected to a potentiometer. Answer the following questions: a) Draw the equivalent circuit and indicate all the given information. b) What is the voltage induced by the potentiometer? Given: Table 8.30 Temperature. °C -150 -100 <-50 <<-25 0 25 50 75 100 150 200 300 400 500 600 800 1000 1200 1500 1750 Thermal emf in absolute millivolts for commonly used thermocouple combinations, according to ITS(90) (Reference junction of 0 C)¹ Copper vs. Constantan (7) -4.648 -3.379 -1.819 -0.940 0 0.992 2.036 3.132 4.279 6.704 9.288 14.862 20.872 Chromel vs. Constantan (E) -7.279 -5.237 -2,787 -1.432 0 1.495 3.048 4.657 6.319 9.789 13.421 21.036 28.946 37.005 45.093 61,017 76.373 Iron vs. Constantan ( -6.500 -4.633 -2.431 -1.239 ( 1.277 2.585 3.918 5.269 8.010 10.779 16.327 21.848 27.393 33.102 45.494 57.953 69.553 Chromel vs. Alumel (K) -4.913 -3.554 -1.889 -0.968 0 1.000 2.023 3.059 4,096 6.138 8.139 12.209 16.397 20.644 24.906 33.275 41.276 48.838 Platinum vs. Platinum-10% Rhodium (S) -11.236 -0.127 0 0.143 0.299 0.467 0.646 1.029 1.441 2.323 3.259 4.233 5.239 7.345 9.587 11.951 15.582 18.503 Nicosil vs. Nisil (N) <-1.530 <-1.222 -0,698 -0.368 0 0.402 0.836 1.297 1.785 2.826 3.943 6.348 8.919 11.603 14.370 20.094 26.046 32.144
Transcribed Image Text:Question 5.1: A thermopile is constructed with chromel-alumel materials. Five junctions are maintained at 400-C and five junctions are maintained at 100°C. The output of the thermopile is connected to a potentiometer. Answer the following questions: a) Draw the equivalent circuit and indicate all the given information. b) What is the voltage induced by the potentiometer? Given: Table 8.30 Temperature. °C -150 -100 <-50 <<-25 0 25 50 75 100 150 200 300 400 500 600 800 1000 1200 1500 1750 Thermal emf in absolute millivolts for commonly used thermocouple combinations, according to ITS(90) (Reference junction of 0 C)¹ Copper vs. Constantan (7) -4.648 -3.379 -1.819 -0.940 0 0.992 2.036 3.132 4.279 6.704 9.288 14.862 20.872 Chromel vs. Constantan (E) -7.279 -5.237 -2,787 -1.432 0 1.495 3.048 4.657 6.319 9.789 13.421 21.036 28.946 37.005 45.093 61,017 76.373 Iron vs. Constantan ( -6.500 -4.633 -2.431 -1.239 ( 1.277 2.585 3.918 5.269 8.010 10.779 16.327 21.848 27.393 33.102 45.494 57.953 69.553 Chromel vs. Alumel (K) -4.913 -3.554 -1.889 -0.968 0 1.000 2.023 3.059 4,096 6.138 8.139 12.209 16.397 20.644 24.906 33.275 41.276 48.838 Platinum vs. Platinum-10% Rhodium (S) -11.236 -0.127 0 0.143 0.299 0.467 0.646 1.029 1.441 2.323 3.259 4.233 5.239 7.345 9.587 11.951 15.582 18.503 Nicosil vs. Nisil (N) <-1.530 <-1.222 -0,698 -0.368 0 0.402 0.836 1.297 1.785 2.826 3.943 6.348 8.919 11.603 14.370 20.094 26.046 32.144
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