It is because of this feature, that the analyzer/sensor system can achieve savings in the amount of nitrogen used while at the same time providing an exact indication of the level of oxygen present.
On the other hand, the blanketing valve provides for a simpler set up, uses no consumable components, like the sensors, and its initial cost is lower than that of an analyzer. For non-critical vessels, where the initial cost is an issue and the amount of nitrogen used is not a concern, this may be the best option. However, for critical systems, where oxygen needs to be closely controlled, the best option is the analyzer/sensor combination.
Both system types offer valuable and important safety/quality enhancement to the vessel they are added to. Although both achieve the same general goal, each offers different advantages. Careful consideration is encouraged when selecting one method for a particular application.