Primarily intended for the comparison of long-stem Standard Platinum Resistance Thermometers (SPRTs), the Model K22 cryostat provides the best uniformity, stability and the broadest operating range available.  The safe, stable and uniform environment allows users to compare up to seven long stem thermometers.  

System performance rivals fixed point cells in accuracy and precision along the range from -190 to +2 °C at a fraction of the cost. In addition, the ability to compare thermometers at temperatures between the fixed points provides an additional check on your calibrations. The system operates economically over the complete range from the Triple Point of Argon through the Triple Point of Water, using Liquid Nitrogen as an expendable coolant. Six peripheral thermowells are arranged off-axis at an angle of approximately 2.2° to allow the sensing end of the thermometer to be in close proximity to the center thermowell while still providing generous clearance for the termination end of the thermometer.

Interactive user interface on a sloping front panel provides convenient system control in a stand-alone configuration. Optional remote interfaces, (RS-232 or IEEE-488), allow users to integrate the K22 into an automated calibration system, dramatically increasing throughput and reducing the cost of primary-level calibrations.