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Whilst heat pipe furnaces offer the ideal environment to melt and freeze ITS-90 Fixed Points the temperature range is limited by fluid that flows inside the pipe. Three zone furnaces can offer wider operating ranges and still meet the requirements for “Optimal Realization of the Defining Points of the ITS-90…” CCT/2000-13. In place of a heat pipe the 17703 Medium Temperature furnace uses top and bottom guard heaters to minimise temperature gradients.

The Model 17703 Furnace can be used with Indium, Tin, Zinc and Aluminium Cells. The substantial furnace core is machined from aluminium bronze.

New Features

From our own ongoing experience and customer feedback we have updated the Isotech Furnace Range to deliver the same proven performance and advanced features but with a number of convenience upgrades to make your life easier.

The controllers have now been relocated to the top for easier operation, we now include an SPRT Stand and Cable Tidies to keep your standards safe and Accessory Pods to keep the
furnace tops free from clutter. Our furnaces are programmable to automatically melt and freeze cells and feature both USB and Ethernet interfaces with bright crystal clear displays.


Technical FeatureValue
Temperature Range50°C to 700°C
Uncertainty<1mK (with cells)
Control0.1°C Resolution
CommunicationsIncluded as standard
Power3kW, 108-130 or 208-240Vac, 50/60Hz
Core Size54.7mm x 420mm
DimensionsHeight 960mm, Width 600mm, Depth 690mm, Weight 115kg
Accessories420-02-18 – Aluminium Bronze Equalising Block, 824-01-00 Fan Assembly (to cool the thermometer handle), 411-01-11B Annealing Adaptor
How to orderITL-M-17703 Medium Temperature Furnace. Please specify the voltage required.


Medium Temperature Furnace

50°C to 700°C

The Medium Temperature Furnace is of a three-zone design. In addition to the main temperature controlled-zone, there are guard heaters at the top and bottom of the block. The furnace has been updated with additional features to make operation simpler and safer.

  • Wide Operating Range
  • Three Zone Control
  • Long Plateau Length

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