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|Title:||Effect of electric current on thermistor temperature error|
|Authors:||Massachusetts Institute of Technology. Dept. of Civil and Sanitary Engineering.|
United States. Army. Corps of Engineers. New England Division.
Rohsenow, Warren M.
|Publisher:||Arctic Construction and Frost Effects Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (Arctic Construction and Frost Effects Laboratory (U.S.)) ; no. 71.|
Summary: Thermistors used as temperature sensing devices develop internal heat by the passage of electrical current during measurements. A theoretical analysis of effect of internal heat generation is applied to one type of thermistor. Calculations of steady-state temperature rise over the ambient indicate that the magnitude of error for the thermistor located in soil, ice, light snow, medium snow, and heavy snow ranged from 6.5 x 10^-5 to 246 x 10^-5 °F, while the magnitude of error for the thermistor located in air ranged from 712 x 10^-5 to 1425 x 10^-5 °F, depending on the heat transfer coefficient. Calculations indicate that in most cases errors due to internal heating may be disregarded for ground and air temperature measurements.
|Appears in Collections:||Technical Report|
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|ACFEL-Technical-Report-71.pdf||1.71 MB||Adobe PDF|