ZHANG Li-li1, HE Xiao-lei2, LU Wei3. Research on error of Pt resistor temperature measurement system based on heat transfer equation[J]. 2012, 31(11): 36-39.
ZHANG Li-li1, HE Xiao-lei2, LU Wei3. Research on error of Pt resistor temperature measurement system based on heat transfer equation[J]. 2012, 31(11): 36-39. DOI: 10.13873/j.1000-97872012.11.012.
Aiming at phenomenon of Pt resistor self-heating effect
error of Pt resistor in temperature measurement is analyzed by theory and an experimental method is proposed to carry out study on system error.Temperature testing environment of Pt resistor is a air tank with limited space
the tank pressure is set 500~ 1 013 hPa
and the temperature of the reservoir is set-70~ 80 ℃.The fluid in the tank is regarded as mixture gas of N2 and O2 which flow naturally.The algorithm establishes a mathematical model by the analysis of the energy dissipation relationship in heat transfer process with the heat transfer theory
the heat flux distribution and mixed air thermophysical properties.By setting up math model
simulation operations are carried out by Matlab.Experimental results show that the error which exists in the measurement of Pt resistor-0.4~ 0.6 ℃ under the conditions of temperature
pressure and weak current that are mentioned above.