Monitoring and control of liquid nitrogen level of the ¹³C separation column using NI PXI-1031

Abstract

This paper is a step forward by making real time control system design to monitor and control process variables to ensure its smooth operation and desired reliability. Liquid nitrogen level in the condenser is a core component of isotopic separation process to obtain (¹³C), so is needed a special focus on monitoring and control. The goal of the work is to design a controller for the liquid nitrogen in the condenser of (¹³C) isotope separation column using NI-PXI 1031 (PCI eXtensions for Instrumentation) from National Instruments. The designed ON-OFF controller is implemented in LabVIEW and are discussed the advantages and disadvantages.

Operational model of the ¹³C isotope separation column

“…Because no (CO) gas is extracted from the column, it accumulates in the boiler. The start mode finish when the (CO) level has a desired set point in the boiler [12].…”

“…For this reason that between the two phases take place a contact, the ( 13 C) concentration rises in the liquid phase. After a certain period of time, which can be days or weeks, the concentration of ( 13 C) reaches the requested level [12].…”

“…The production (extraction mode) is the phase when from the bottom of the column (at the level of the boiler) ( 13 C) isotope enriched (CO) gas is extracted [12].…”