Hart Scientific 7196-4 - LN2 Comparison Calibrator, 4 holes

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

Detaily
Špecifikácie

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, Hart’s Model 7196 LN₂ Comparison Calibrators will solve your problems. And they do it for less than half the price of other argon triple point simulators.

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.

Hart’s LN₂ Comparison Calibrators consist of a super-insulated glass dewar, 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 7196-4 includes four 8-mm (0.32") wells. The 7196-13 includes five 8-mm (0.32") wells and eight 6.35-mm (0.25") wells.

Hart’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 Hart Scientific today. (Or come to one of our training courses and we’ll show you.)

Specifications
Temperature	Nominal –196°C depending on atmospheric pressure
Thermal Wells	7196-4: four 8 mm (0.32”) I.D. wells 7196-13: 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	180 mm O.D. x 385 mm high
Temperature Uniformity	Typically better than 2 mK
Volume	3.5 liters of liquid nitrogen