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Cryogenically cooled temperature chambers use L-N2
or L-CO2
for cooling and are very fast. They have greater and more efficient cooling capacity than mechanically cooled chambers. Cryogenically cooled chambers also offer a wider temperature range than mechanically cooled chambers. When compared to mechanically cooled chambers, cryogenically cooled chambers are quieter and cooler runnining, due to their lack of compressor noise and heat, have a smaller footprint, and are more economical - both to purchase and to maintain.
Cryogenic cooling is the best choice for applications that require fast downward temperature transitions or very low temperatures, below the limits of mechanical refrigeration. If low temperatures are not held for long periods, cryogenic cooling can be very cost effective. Temperature chambers with cryogenic cooling are simple to use, easy to maintain, and inexpensive to repair.
If precision, speed, innovative design, and durable operation are of interest to you then Sigma Quality is the Ultimate Value.
The practical operating limits for cryogenic cooling are as follows:
Liquid Carbon Dioxide (L-CO2
) -65°C
Liquid Nitrogen (L-N2
) -170°C
Using L-CO2
and L-N2
below these temperatures will prove to be inefficient and can be a poor decision.
The sublimation temperature of L-CO2
is -69.9°C at 1 atm, but operation of a chamber at this temperature results in puddling of L-CO2
and dry ice formation that is both wasteful and a hazard to workers. L-N2
boils at -195.85°C but oxygen will liquefy and puddle at -182.95°C. Staying well away from this limit is imperative for safety.
As with mechanical refrigeration, it makes sense and improves efficiency to not use a coolant near the limits of its performance unless absolutely necessary. L-CO2
is inefficient at -65°C, but L-N2
is very efficient at this temperature and down to -170°C.
Why are Sigma Temperature Chambers Superior?
(What Sigma quality & engineering means to you)
Temperature Chamber options and accessories
How to Select
the Correct Size Chamber
Chambers vs Platforms
Cryogenic vs Mechanical Cooling
Controllers and failsafes
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