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US 3,943,774 AGranted
Precision temperature control
AssigneeGesellschaft fur Kernforschung m.b.H.
InventorHerwig Pollanz
Life of this patent
Estimating the term…
Abstract
A method and apparatus for accurately holding a sample at a temperature in the range below 0.degree.C by maintaining a constant temperature drop between an apparatus holding the sample and a coolant which is at a lower temperature, accompanied by inflow and outflow of small amounts of heat. The sample may be a measuring gas whose moisture content is to be set by establishing a given dew point temperature.
Claims10
Apparatus for giving a gas a predetermined moisture content at a dew point in a temperature range below 0.degree.C, comprising:
- a first insulated vessel;
- a cooling trap disposed in said first insulated vessel;
- a second insulated vessel in which the first insulated vessel is disposed;
- a mass of liquid coolant partially filling said second insulated vessel;
- level control means operatively arranged for maintaining said coolant above a predetermined level in said second vessel, said first insulated vessel being immersed with its lower end into the liquid coolant;
- means for causing such gas to flow through said cooling trap;
- and a first thermocouple disposed at the point of gas flow direction reversal in said cooling trap for measuring the dew point temperature of the gas.
4 more elements
Dependencies are inferred from the claim text.