The Nitrogen Production and Liquefaction Unit (NPLU) is a significant addition to the Madeira Chemistry Research Centre (CQM). It was funded by Madeira Program 14-20 (ARDITI - M1420-01-0145-FEDER-000005 - CQM⁺) to improve the infrastructure and operational capacity of CQM in terms of its self-sufficiency in liquid nitrogen, which is essential for its research. The equipment was purchased from Stirling Cryogenics, an industry leader with over 65 years of experience.

The NPLU of CQM stands out for its exceptional efficiency, automation capabilities, robust design, and reliability. It utilises advanced gas separator technology to produce liquid nitrogen of unsurpassed purity, thereby minimising the presence of residual gases. However, it is essential to note that liquid nitrogen can be hazardous due to its colourless, odourless nature, and extreme cold. Therefore, it is crucial to follow strict safety protocols, including proper handling procedures and the use of appropriate safety equipment and personal protective gear, to mitigate the risks of burns. The NPLU is located in a protected and open space area that is under continuous surveillance to prevent asphyxiation and intrusion.