Product Description
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 the patented Isothermal Towers the fixed point cell and heat pipe (or heat siphon) have been combined 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.
The Isothermal Towers performance has 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!
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.
Tech Spec
| 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 hours | “ | “ | “ |
| UKAS Uncertainty: Primary Service | ±0.7mK | ±0.8mK | ±1mK | ±2mK |
| UKAS Uncertainty: Standard Service | ±2mK | ±2mK | ±2mK | ±6mK |
| Heating Time | 2 hours | “ | “ | “ |
| Pocket Diameter | 8mm | 8mm | 8mm | 8mm |
| Total Immersion Depth | 290mm | 290mm | 290mm | 290mm |
| Depth of metal surface to bottom of reentrant tube | 180mm | 180mm | 180mm | 180mm |
| Power | 900W | 900W | 900W | 900W |
| Voltage | 110Vac or 230Vac 50/60Hz | 110Vac or 230Vac 50/60Hz | 110Vac or 230Vac 50/60Hz | 110Vac or 230Vac 50/60Hz |
| Dimensions | Height 430mm, Width 310mm, Depth 300mm | Height 430mm, Width 310mm, Depth 300mm | Height 430mm, Width 310mm, Depth 300mm | Height 430mm, Width 310mm, Depth 300mm |
| Weight | 15kg | 15kg | 15kg | 15kg |
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Product Description
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 the patented Isothermal Towers the fixed point cell and heat pipe (or heat siphon) have been combined 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.
The Isothermal Towers performance has 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!
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.
Tech Spec
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 hours “ “ “ UKAS Uncertainty: Primary Service ±0.7mK ±0.8mK ±1mK ±2mK UKAS Uncertainty: Standard Service ±2mK ±2mK ±2mK ±6mK Heating Time 2 hours “ “ “ Pocket Diameter 8mm 8mm 8mm 8mm Total Immersion Depth 290mm 290mm 290mm 290mm Depth of metal surface to bottom of reentrant tube 180mm 180mm 180mm 180mm Power 900W 900W 900W 900W Voltage 110Vac or 230Vac 50/60Hz 110Vac or 230Vac 50/60Hz 110Vac or 230Vac 50/60Hz 110Vac or 230Vac 50/60Hz Dimensions Height 430mm, Width 310mm, Depth 300mm Height 430mm, Width 310mm, Depth 300mm Height 430mm, Width 310mm, Depth 300mm Height 430mm, Width 310mm, Depth 300mm Weight 15kg 15kg 15kg 15kg Downloads
