Liquid gas temperature control apparatus for and methods of depressing temperature to and maintaining it at a chosen depressed value

摘要: Apparatus and methods are disclosed for lowering the temperature within a chamber from higher actual value to set desired lower value, latter being stabilized by intermittently flowing liquid gas selectively through venting orifice, under control of microcomputer responding sensor chamber. In one embodiment (FIG. 2), (2) orifice (11B) is supplied with coolant separate solenoid valves (1,5) which both open allow maximum flow rate during initial cool-down settling down stage approach steady state follow operate much reduced in coordinated intermittent mode wherein valve (5) only when extra cooling momentarily required assist action (1) supplying