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Metrology Furnace, Model 465, 3 Zone Temperature Control
Isotech Model 465 Metrology Furnace (200°C to 1200°C)
 
3 Zone Control System for Minimal Thermal Gradients for Half the Price of Heat Pipes.
200C to 1200C (2192F)
Ideal for Creating and Maintaining Fixed Points Cells, Indium to Copper
  • Wide Temperature Range: 200C to 1200C
  • Covers ITS-90 Fixed Points from tin to copper in one furnace
  • Long plateaus
  • Self-tuning controller optimizes each Fixed Point Cell performance
  • 3 zones controlled to compensate for end loss to give a perfect profile


Product Code: 465
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   Product Description    Specifications
 
This more recent addition to our long-established range of metrology furnaces offers an alternative for those who prefer 3-Zone furnaces to heat pipe technology. The three zones create a controlled volume of constant temperature within the furnace, in which High-Temperature Fixed Points such as aluminum, silver and copper can be frozen and melted. Because high-temperature thermometers can be easily contaminated by metallic vapors, great care has been taken to eliminate the use of metals throughout the calibration volume. The cell holder is made of alumina.

A ceramic equalizing block is available, composed of a closed-ended tube, alumina tubes to house the sensors being compared, and alumina powder to act as an equalizing medium

The sensor for the main controller is a mineral-insulated type N thermocouple, which has been found to be more stable than the type R thermocouple. In addition, two slave controllers compensate for any temperature gradient along the furnace by eliminating any temperature difference that they sense.

There is a cooling oil in the lid with connections to circulate tap water to keep the furnace lid cool, protecting the SPRT and reducing heat load into the lab. A flow of 0.5 to 1 liter per minute is required at temperatures above 700C

This 3-Zone Furnace can be used for the realizations of zinc, aluminium, silver, gold and copper points, or with an optional equalizing block used for annealing or comparison calibration.

Literature
3 Zone Metrology Furnace Manual
Model 465 Metrology Furnace Datasheet Model 465 Metrology Furnace Manual