The automatic liquid nitrogen ???lling system for GDA detectors

摘要

An indigenously developed automatic liquid nitrogen (LN2) ???lling system has been installed in gamma detector array (GDA) facility at Nuclear Science Centre. Electro-pneumatic valves are used for ???lling the liquid nitrogen into the high purity germanium detector cryostat. The temperature of the out-???owing gas/liquid from the cryostat is monitored using platinum resistor thermometer. The program allows for automatic ???lling at regular intervals with temperature monitoring from a remote terminal.