Application Note: Oxygen Measurement in Nitrogen Blanketing

Background
Storage, transportation and handling of flammable liquids and dust can create risk of explosion or fire.  Especially milling operations or centrifuges that separate solids from organic solvents, are vulnerable to this threat. The rotating equipment generates heat or may cause electrostatic discharge which is all that is needed to ignite an explosive mixture.

Nitrogen blanketing is therefore carried out to generate a non-combustible atmosphere with low oxygen contents. To achieve this, the centrifuge or tank is purged with a controlled stream of nitrogen to keep the oxygen level below the Limiting Oxygen Concentration (LOC) .

In order to prevent the oxygen concentration from exceeding the limiting oxygen concentration (LOC usually < 10%), the control loop initiates purging of the vessel when an upper intervention limit is exceeded.......

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