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Heat Pipe Metrology Furnaces
Isotech Heat Pipe Temperature Metrology Furnaces
Stress-Free Heat Pipes
  • Essentially Gradient Free
  • Heat pipe Operation from Indium to Copper
  • Simple Use - no zone offsets to adjust

Product Code: HEAT PIPES
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   Product Description
Heatpipes provide the ideal conditions for the creation and maintenance of freeze points from ITS-90.

1. The furnace core is an especially-designed stress-free isothermal heat pipe, which provides a very low thermal gradient along the core working length. The furnace heater is of the parallel-tube design used at NIST.

2. The heat pipe 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.

3. Three temperature ranges are available:
Low Temperature: 125C to 250C, 17702W, Water
High Temperature: 400C to 1000C, 17702P, Potassium
Very High Temperature: 500C to 1090C, 17702S, Sodium

Connections are provided for a water supply of 0.5 to 1 liter per minute to cool the top of the apparatus (not on 17702W). An ordinary garden hose may be used for water supply and waste connections. Use without cooling is not recommended above 700C.

4. An advanced proportional electronic control system controls the furnace temperature. The control may be self-calibrated using Freeze Point Cells as references. Two entirely independent over-temperature safety circuits are provided. The active safety is a second (off-on) control circuit driven by a second thermocouple. The passive safety is a fusible link in the main power supply.