7196B LN2 Comparison Calibrator





7196B LN2 Comparison Calibrator

The nominal boiling point of nitrogen is –196°C at one atmosphere of pressure. The defining triple point of argon is –189.3442°C. While there is a difference between the nominal boiling point of nitrogen and the argon triple point, the difference can be corrected for mathematically, and an uncertainty of less than 2 mK from the actual argon triple point is achievable.

Fluke Calibration’s LN2 Comparison Calibrators consist of a vacuum-sealed stainless steel Dewar Flask, a high-purity copper block, and a precision-fit lid. The dewar is filled with LN2 and the copper block is suspended in it; an SPRT is inserted into the block and a calibration is performed against your own calibrated SPRT. The 7196B-4 includes four 8-mm (0.32″) wells. The 7196B-13 includes five 8-mm (0.32″) wells and eight 6.35-mm (0.25″) wells.

Fluke Calibration’s LN2 Comparison Calibrators are neither expensive nor complicated to use. If you need supporting data or would like to discuss the theory of operation of an LN2 Comparison Calibrator, call Fluke Calibration today. (Or come to one of our calibration training courses and we’ll show you.)


Lowest-cost calibration to -196 °C

  • Low-cost calibrations to –196°C
  • Simple to use
  • Uncertainty less than 2 mK

If you need to do calibrations at the triple point of argon but don’t want the complexity and cost of using an argon triple point cell, Fluke Calibration’s Model 7196B LN2 Comparison Calibrators will solve your problems. And they do it for less than half the price of other argon triple point simulators.


TemperatureNominal –196°C depending on atmospheric pressure
Thermal Wells7196B-4: four 8 mm (0.32″) I.D. wells
7196B-13: five 8 mm (0.32″) I.D. wells, eight 6.35 mm (0.25″) I.D. wells
Both blocks: 275 mm immersion from top of lid to bottom of well, 150 mm immersion into copper block
Dimensions (outer diameter x height)168 mm x 406 mm (6.6 in O.D. x 16 in)
Temperature StabilityTypically better than 2 mK/20 min[1]
Temperature Uniformity<0.0004 °C
Volume5.47 liters (1.45 gallons)
[1] The equilibrium temperature will change with the atmospheric pressure (dT/dp » 0.085 mK/Pa). The actual temperature stability depends on atmospheric pressure stability.

Models and Accessories

Model NameDescription

LN2 Comparison Calibrator, 4 holes


LN2 Comparison Calibrator, 13 holes

Knowledge and Information

Product Manuals
Important : Refer to the User’s Guide Supplement for instructions on how to safely fill and use the 7196B.
application/pdf icon 7196 LN2 Comparator User’s Guide (115.2 KB)
application/pdf icon 7196 LN2 Comparator User’s Guide Supplement (466.63 KB)