A system for delivering a cryogenic fluid to cool devices, such as electronic devices, in an open-cycle environment. The system comprises a dewar which stores a cold fluid, a cryogenic module for holding a device to be cooled and a cold fluid transfer line which delivers the cold fluid from the dewar to the device within the cryogenic module. The system further comprises an interlock mechanism to hold the transfer line and the dewar securely together and a coupling mechanism to allow the transfer line to securely engage the cryogenic module. The system also comprises a control subsystem which monitors and controls the flow of cold fluid from the dewar and through the transfer line.