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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > February  >
In the Laboratory
A Virtual Instrument Panel and Serial Interface for the Parr 1672 Thermometer
Gail Salter
Department of Chemistry, Lafayette College, Easton, PA 18042-1782

Kevin Range
Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431

Carl Salter
Department of Chemistry, Moravian College, Bethlehem, PA 18018

Cover
February 2005
Vol. 82 No. 2
p. 297
Abstract
A program written in Visual Basic 6.0 provides a virtual instrument panel and real-time interface for the Parr 1672 thermometer. The program permits computer control and data acquisition when the 1672 thermometer is used for a bomb calorimetry or solution calorimetry experiment. Details of the serial communication link between the 1672 and the remote computer are described. An unusual calorimetry experiment demonstrates the desirability of real-time display of thermometric data: when solid oxalic acid is mixed with a limited amount of NaOH the initial exothermic neutralization reaction is followed by a slower endothermic solution of the excess oxalic acid. The overall temperature change of the process is less than 0.001 °C even though the peak temperature increase is almost 0.3 °C. Without a graphical display of the thermogram this unusual temperature spike might be missed.
Supplement
A description of the Parr 1672 thermometer and its built-in routines, the essential elements of the virtual instrument panel program's interface to the 1672, and a description of its application in a typical solution calorimetry experiment are available.
*  Contents JCE2005p0297W.doc (Microsoft Word)
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*  Citation
 Salter, Gail; Range, Kevin; Salter, Carl. J. Chem. Educ. 2005 82 297.
*  Keywords
 Calorimetry; Laboratory Computing / Interfacing; Physical Chemistry; Thermodynamics
*  History
 Created:
Last Updated:		 January 4, 2005
January 14, 2005
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