TW-357 REV E
11
OPERATION
These instructions are for operators experienced with cryogenic equipment. Before operating the system,
become familiar with the safety precautions in this manual and in reference publications. Make certain all
applicable provisions set forth in the Installation Section have been followed before placing a system in
operation. Study this manual thoroughly. Know the location and function of all system components.
Initial Fill
The LABS cryostorage system using the KRYOS controller, comes preset from the factory. The liquid
nitrogen supply pressure at the inlet to the refrigerator should be in the range of 10 psig (0.7 bar/69 kPa) to 20
psig (1.4 bar/138 kPa) for optimum performance. Higher operating pressures will increase transfer losses and
create excessive turbulence of the liquid in the refrigerator which can generate false signals to the liquid level
controller causing the refrigerator to under fill. In “liquid phase” storage applications, excessive turbulence
can cause splashing which could result in personal injury.
WARNING: Maintain adequate ventilation to prevent asphyxiation hazard (see Safety Precautions).
WARNING: If the fill fails to stop for any reason, quickly close the liquid supply valve to prevent
overfilling until the cause of the problem can be determined.
