Liquid Nitrogen (LN2) Level Controller for Cryogenic Freezers

See the Manual for the LLC

Liquid Level Controller (LLC) Description

The LLC is a 24 volt, thermistor based liquid nitrogen level control for cryogenic freezers. It incorporates redundant high level and low level shielded sensors with continuous self diagnostics to monitor and control the liquid nitrogen level in the dewar. In addition to the basic control output, the LLC also has overfill and underfill outputs to connect to shutdown or tank switcher circuits. It features local audible and visual as well as remote alarms contacts. To conserve nitrogen, an automatic one-fill-all-fill circuit enables filling of all freezers on the system when one calls for liquid. The basic LLC includes the controller, a pair of 8' sensors (high and low), and an 8' output cable.

LN2 Level Controller

999.004	Basic LLC (No Gauge or Power Supply)
990.013	Level Gauge Option
412.002	24 vdc 1.25 A Power Supply
990.007	Replacement Low (White) Sensor 8'
990.008	Replacement High (Red) Sensor 8'
990.009	Output Cable Assembly 8'