DESEMPENHO DE DIFERENTES BITOLAS DE TERMOPAR EM UM PSICRÔMETRO ASPIRADO DE BAIXO CUSTO

Abstract

The objective of this work was to evaluate an aspirated psychrometer constructed under different thermocouple gauges. Were used three thermocouple copper-constantan gauge: 24 AWG (0.511 mm of diameter), 32 AWG (0.202 mm of diameter) and 40 AWG (0.080 mm of diameter). The thermocouples were placed into a single psychrometer and each one positioned side by side at a distance of approximately 30 mm each other. Hourly air temperature and humidity values obtained from each gauge were compared with the values obtained with a thermistor and capacitive hygrometer. The results showed that the thermocouple gauges used (24, 32 and 40 AWG) had high correlation and accuracy with values determined by the hygrometer (r2 > 0.97, RMSE P 3.91%).