Trends in Temperature Calibration. David Southworth VP: Sales and Marketing Isothermal Technology Ltd, UK (Isotech) www.isotech.co.uk. Trends in Temperature Calibration. We see from Industry to Primary Metrology a demand for greater accuracy A demand for more confidence
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VP: Sales and Marketing
Isothermal Technology Ltd, UK (Isotech)
Many Nations rely on Isotech for their Primary Temperature Standards
But how are the reference thermometers calibrated?Introduction
A fixed point cell (an ingot of pure metal inside a specially shaped graphite crucible)
An apparatus or furnace to melt and freeze the ingot of metal uniformly
The thermometer must be sufficiently immersed so that the sensing element is at the cell’s temperatureIntroduction
The shorter, smaller and cheaper fixed points are approximations to those in National Laboratories and they seldom provide sufficient immersion for the thermometer being calibratedIntroduction
This is not very satisfactoryIntroduction
What if the cell and furnace become one and inseparable?
What if the immersion necessary is calculated and compensated?
Might we end up with a novel but improved solution to fixed point calibration?A New Approach
The key feature of the Siphonic Dewar is that it is gradient-free so a cell inside will melt and freeze uniformly
Next the cell fits snugly inside and is sealed in place surrounded by 1 atmosphere of pure argonNew Design (Patents Applied For)
The millisKanner allows for more channels
(273.16 K )
A Sealed Fixed Point Cell