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Thermoelectric temperature control device for vapor pressure measurements

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1 Author(s)
Berg, Robert F. ; National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.3628668 

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 surrounding aluminum block. The uncertainty due to the offset is small compared to the 6 mK uncertainty due to the thermometer.

Published in:

Review of Scientific Instruments  (Volume:82 ,  Issue: 8 )

Date of Publication:

Aug 2011

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