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> Large ice point temperature calibration cell
Large ice point temperature calibration cell
Historically, the Ice Point bath temperature of 0.0 deg.C has been used for temperature calibration because it is theoretically simple to make and easy to use. At least that's how it used to be. As the metrology of temperature improved over generations, the errors in preparation and the non-reproducibility of results became a real conundrum. Better detectors, better bridges and readouts, and better water purification methods began to magnify the errors in the measurements. A good source of information about making an Ice Point calibration bath is the NIST publication TN 1411.
The problems and errors associated with making a good Ice Point bath can be reduced to smaller numbers by using the purest materials and following the procedures similar to those outlined in publications like the ASTM Standard Practice E563. Also, the way to get the best numbers from any Ice Point bath is to stir the bath. Error gradients in a un-stirred Ice Point bath can be up to 4 deg. C. Knowing all this, we can only come to one conclusion: an Ice Point bath is easy to make; an Ice Point bath that produces good numbers is almost impossible to make!
This closed-Cell environment means that the measurement is never at the risk of unknown contamination levels, thermal gradients, barometric pressure changes, or any of the other setbacks described in the existing literature. Used with a maintenance ice bath or refrigerated bath, the IPW Cell's mantle (just like in a TPW Cell) can last from days to months.
Specifications: overall height - 15"; diameter - 2.5"; ice mantle - 8.5"; thermometer well I.D. - 0.5"; thermometer well overall - 12.5". These are all nominal measurements.
