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| Infrared Calibration | |
| Blackbody Sources Oberon Model 426 | |
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Gradient Free Furnace for Blackbody Fixed Points |
 From Databook 4 |
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 Data Sheet |
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Model 426 is for Aluminium, Silver, Gold or Copper. Heatpipes provide the ideal conditions for the creation and maintenance of slim ITS-90 cells. The furnace core is a specially-designed stress-free isothermal heat pipe, which provides a very low thermal gradient along the core working length. The furnace heater is of the non-inductive bird-cage design insulated by twin bore alumina tubes. The heatpipe is designed so that the inner wall is not subject to thermal expansion stresses from the outer wall before the heat pipe reaches conduction temperature. The working fluid is permanently and safely sealed within the plasma-arc welded enclosure. The range of the high temperature furnace is suitable for Aluminium, Silver, Gold or Copper Blackbody Fixed Point Cells. An advanced state of the art electronic control system controls the furnace temperature. The control may be self-calibrated using freeze-point cells as references. An over-temperature safety circuit is provided, using an on/off circuit driven by a second thermocouple. |
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