Abstract
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 P.I.D. output of the DSC controller which in turn is controlled directly from the Polymer Laboratories Limited software system. The proportioning valve adjusts the amount of liquid nitrogen required by the DSC as determined by the P.I.D. 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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