The LN2 Distribution System at Arizona State University automatically dispenses liquid nitrogen (LN2) through controlled cryogenic valves. It restricts access to authorized customers, monitors system status, provides customers real-time information, and records dispensed LN2 volumes in an Access database for billing reports. The system utilizes an Electronics Control Module interfacing with components like valves, sensors and a barcode reader, controlled by a control application on a local computer. Physical components include a fill stand, card reader, display, and plumbing manifold. The LN2Control software autonomously controls dispensing while monitoring safety and recording all activity.

1. ARIZONA STATE UNIVERSITY
LN2 DISTRIBUTION SYSTEM
The LN2 Distribution System is designed for fully automated LN2 dispensing. The system restricts
access to only authorized customers, controls cryogenic valves to allow dispensing, monitors system
status and health, provides the customer with real-time information, and records the volume of LN2
dispensed. The records are saved in an Access database utilizing SQL for running customer billing
reports and account maintenance.
The system utilizes a custom designed Electronics Control Module (ECM) that physically interfaces
with all the system’s components (solenoid valves, temperature sensors, flow meters, barcode
reader, etc.) and includes a single-board computer that communicates with the system’s overall
control application, LN2Control, running on a local Windows computer.

2. There are numerous physical components in the system outside at the distribution station:
 Fill stand
 Account card reader
 Remote display
 Plumbing manifold (solenoid valves, temperature sensors, flowmeter, manual shutoff valves,
pressure relief valves, tank level gage, etc.)

3. The LN2Control software application allows for autonomous control of the dispensing process as well
as safety monitoring, manual control, troubleshooting, and recording of all system activity.
LN2Control – Main Screen