NASA NTRS · 19700000608
Accurate, rapid, temperature and liquid-level sensor for cryogenic tanks
Abstract
Thermopiles measure ullage gas temperatures to within plus or minus 1.65 deg K between 20 and 300 deg K, and also serve as point liquid-level sensors. Thermopile technique measures smaller temperature differences by keeping the reference junctions inside the tank and near the temperature range of the measuring junction.
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De Witt, R. L., Stochl, R. J., Terbeek, H. G.. 1970-11-01. Accurate, rapid, temperature and liquid-level sensor for cryogenic tanks. https://ntrs.nasa.gov/citations/19700000608
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