Fixed point temperature standard. (ITS-90)

Isotech did introduce a new type of ITS-90 Calibration Device.
These devices use a siphonic cell - a combined heat pipe and ITS-90 Fixed Point Cell. Additionally an immersion compensator provides an isothermal zone to compensate for stem conduction problems.
The result is an affordable calibration solution providing performance that previously has required large and expensive furnaces and cells.
These "ITS-90 Isothermal Towers" are available in four models covering the Indium 156°C, Tin 232°C, Zinc 419°C and Aluminium 660°C Fixed PointsDescription

The leading Primary Laboratories use large fixed point cells in deep calibration furnaces that utilize Heat Pipes to eliminate temperature gradients. This combination of cell and furnace gives the smallest of uncertainties. In Isothermal Towers the fixed point cell and heat pipe (or heat siphon) have been combined (patent applied for) to produce the ideal realizations for calibrating standard thermometers.
Thermometers can only be calibrated accurately if they are immersed sufficiently. In Isothermal Towers a heated block (Immersion Compensator, patent applied for) sits on top the heat siphon/cell to fully compensate for the immersion characteristics of the unit under test.

For detailed specifications please click ISOTower.
For more technical details and an evaluation report just click Technical article/evaluation report.