Berg, R.
(2011),
Thermoelectric temperature control device for vapor pressure measurements, Review of Scientific Instruments, [online], https://doi.org/10.1063/1.3628668
(Accessed December 30, 2024)
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Thermoelectric temperature control device for vapor pressure measurements
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Abstract
The static method of measuring equilibrium vapor pressure requires locating the sample at the coldest part of the apparatus to avoid errors due to evaporation and recondensation elsewhere. This paper describes a device that can hold the sample 1 K below the temperature of the surrounding air without a liquid bath. It comprises a pair of thermoelectric elements and two thermometers attached to an insulated aluminum block. The device can operate as high as 200 °C while controlling the sample with a precision of 0.02 K; below 110 °C the precision is 2 mK. Also described is a method to measure the small temperature offset due to heat flow between the sample and the the surrounding aluminum block. The uncertainty due to the offset is small compared to the 6 mK uncertainty due to the thermometer.Citation
Review of Scientific Instruments
Volume
82
Pub Type
Journals
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Created August 31, 2011, Updated November 10, 2018