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J.G. Van-de-Velde, J.D. Mitchell


A new precision-controlled cooling system in Differential Scanning Calorimetry (DSC)


Polimery 1993, No 6, 274


DOI: dx.doi.org/10.14314/polimery.1993.274

Summary

A system is described which introduces a cooling system based on a proportional liquid nitrogen control valve. This is driven directly from the 3-term PID output of the DSC controller which in turn is controlled directly by the Polymer Laboratories Limited software system. The proportioning valve adjusts the amount of liquid nitrogen required by the DSC as determined by the PID control algorithm. By varying the nitrogen flow according to demand, absolute repeatability is ensured from run to run and a considerable saving in liquid nitrogen is achieved. Thus the DSC performs identically in heating or cooling mode.


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