Transcription of SOLUTIONS TO PROBLEMS FROM CHAPTER 2 - Engineering
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SOLUTIONS TO PROBLEMS FROM CHAPTER 2 - Engineering
SOLUTIONS TO PROBLEMS FROM CHAPTER 2 A K thermocouple produces a voltage which is measured by the potentiometer as 25mV. Determine the temperature T when the Reference Junction isothermal block is indicated by a thermistor as 0 oC. Use the Seebeck coefficient for 20oC. Solution At 0 oC., the two junctions produce each voltages of 0 V. For the Seebeck coefficient at 20 oC of 40 V/o C, the temperature at junction J is T = (25000 V) /( 40 V/o C) = 625 oC This temperature is much higher than 20 oC and, consequently, the result using the Seebeck coefficient for 20oC is approximate.
table or p(V) polynomial for K thermocouple. 2.2. A PC based data acquisition system is considered for a K type thermocouple. Two limit designs will have to be evaluated. Design a) a cheap and less accurate design with: -a 4-bit A/D converter; -a standard electronic reference junction block with a temperature uncertainty of ∀0.570 C at 00 C;
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