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Isotower ITS-90 Fixed Points
Isotech, Isotower ITS-90 Fixed Points
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New - New Concept in Primary Temperature Calibration !
ITS-90 Isothermal Fixed Point Towers

  • Large cell performance with slim cell price
  • 30 Hour Plateaus
  • Uniquely integrated device with know immersion characteristics
  • Simple & safe with no glass parts
  • Easily transportable - Perfect Audit Item
  • Lower your uncertainties and increase your confidence

Product Code: ISOTOWERS

   Product Description    Downloads

ITS-90 Fixed Point Cells

Isothermal Fixed Point Towers

The most accurately defined temperatures are those defining points (fixed points) of ITS-90. The leading Primary Laboratories use large fixed point cells in deep calibration furnaces that utilise 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 realisations 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.

Isothermal Towers have all been fully evaluated against the most detailed and demanding requirements ever written: CCT/2000-13. All Isothermal Towers; Indium, Tin, Zinc and Aluminium meet all the requirements of CCT/2000-13 allowing laboratories to realise the smallest uncertainties, at a fraction of the cost of conventional Metrology Furnaces with Primary Standard Cells

You can purchase three Isothermal Towers; Tin, Zinc and Aluminium for a similar price as one conventional cell and heat pipe apparatus!

Ease of use
Isothermal Towers are simple to use, and very robust. Operation is risk free, as a combined apparatus there is no need to handle a fragile cell. No need for specialist training courses. Isothermal Towers remove the mystery from fixed point calibration. Easily set to provide a melt or freeze of 24 hours or more, lending themselves for automatic calibration and providing your lab with an all day long plateau.

Perfect Audit Item
As an audit item, an accreditation authority can send the device to laboratories for intercomparison. Because the cell, apparatus and immersion compensator are a single entity, the performance is unambiguous unlike existing systems where cell and apparatus are often separated during intercomparison. Accreditation authorities love them.

Available to Hire
Additionally Isothermal Towers are available to hire from Isotech and a growing number of Isotech Distributors to allow laboratories to audit themselves by intercomparing their cells and standard thermometers to a UKAS calibrated Isothermal Tower.

ITS-90 Isothermal Towers are transportable by carrier; there are no fragile glass parts!

Model 490 491 492 493
ITS-90 Point Indium Tin Zinc Aluminium
Temperature 156.5985°C 231.928°C 419.527°C 660.323°C
Metal Purity 6N 6N 6N 6N
Plateau Duration Up to 30 hrs Up to 30 hrs Up to 30 hrs Up to 30 hrs
UKAS Uncertainty: Premium Service* ±0.7mK ±0.8mK ±1mK ±2mK
UKAS Uncertainty: Standard Service * ±2mK ±2mK ±2mK ±6mK
Heating Time 2 hrs 2 hrs 2 hrs 2 hrs
Pocket Diameter 8 mm 8 mm 8 mm 8 mm
Total Immersion Depth 290 mm 290 mm 290 mm 290 mm
Depth of metal surface to bottom of reentrant tube 180 mm 180 mm 180 mm 180 mm
PC Interface Supplied with PC Cable and Software Supplied with PC Cable and Software Supplied with PC Cable and Software Supplied with PC Cable and Software
Power 900 Watts 900 Watts 900 Watts 900 Watts
Voltage 110 vac or 230 Vac 50/60Hz 110 vac or 230 Vac 50/60Hz 110 vac or 230 Vac 50/60Hz 110 vac or 230 Vac 50/60Hz
Dimensions H 430 mm x W 310 mm x D 300 mm H 430 mm x W 310 mm x D 300 mm H 430 mm x W 310 mm x D 300 mm H 430 mm x W 310 mm x D 300 mm
Weight 15kg 15kg 15kg 15kg
* UKAS Calibration is Optional, Uncertainties apply to whole system

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