A thermocouple Type K is calibrated in lab condition at 50% relative humidity (RH) prior to...

 

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A thermocouple Type K is calibrated in lab condition at 50% relative humidity (RH) prior to outdoor operation. After 12-month in outdoor installation, the thermocouple is again tested at 75% RH. Both results are shown in the table below. TABLE Q1 Outdoor test (75% RH) Emt output, V (mv) Temperature, T (°C) 0 50 100 150 200 Lab condition (50% RH) Emf output, V (mv) 0.000 2.023 4.046 6.069 8.092 -0.200 2.037 4.274 6.511 8.748 (a) Does the thermocouple produce linear input-output relationship in outdoor test results? Explain why. (b) Calculate the thermocouple sensitivity, S50 obtained during calibration at 50% RH. [2 marks) (c) Calculate the thermocouple sensitivity, S75 obtained during outdoor test at 75% RH. [2 marks] (d) Determine zero drift coefficient from the results in Table Q1 [2 marks] [2 marks] A thermocouple Type K is calibrated in lab condition at 50% relative humidity (RH) prior to outdoor operation. After 12-month in outdoor installation, the thermocouple is again tested at 75% RH. Both results are shown in the table below. TABLE Q1 Outdoor test (75% RH) Emt output, V (mv) Temperature, T (°C) 0 50 100 150 200 Lab condition (50% RH) Emf output, V (mv) 0.000 2.023 4.046 6.069 8.092 -0.200 2.037 4.274 6.511 8.748 (a) Does the thermocouple produce linear input-output relationship in outdoor test results? Explain why. (b) Calculate the thermocouple sensitivity, S50 obtained during calibration at 50% RH. [2 marks) (c) Calculate the thermocouple sensitivity, S75 obtained during outdoor test at 75% RH. [2 marks] (d) Determine zero drift coefficient from the results in Table Q1 [2 marks] [2 marks]

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