The CA5000-N from Hampshire Controls safeguards biological materials by delivering freezer backup for ultra-low temperature (ULT) storage. The system includes temperature monitoring, onsite and remote alarms, battery backup, and liquid nitrogen (LN2) for more than 48 hours of extended cold storage operation, providing the time to restore power, repair the freezer, or transfer the freezer’s contents. A manual LN2 injection from the CA5000-N will bring a freezer to ULT immediately without having to wait for a typical cooldown interval. Designed for easy programming, the system includes settings for alarm temperature conditions, alarm delay periods, and backup LN2 injection initiation conditions.