Nuclear Magnetic Resonance (NMR) spectroscopy is an analytical method based on the resonance phenomenon of non-zero spin quantum nuclei absorbing radio frequency energy corresponding to the energy difference between their split energy levels in an external low-temperature superconducting strong magnetic field.

The superconducting magnet is immersed in a liquid helium environment, and the outer layer of the liquid helium is liquid nitrogen. The role of liquid helium is to maintain the superconductivity of the magnet to provide the required magnetic field environment, and the purpose of liquid nitrogen is to add a "thermal insulation layer" between the liquid helium and the external environment to reduce the volatilization of the liquid helium.

Refill the NMR with liquid nitrogen.The YDZ liquid nitrogen tank can replenish liquid nitrogen for the required equipment through pressure, which is safe and easy to use.