ChemPharma - Product storage
In every production process, including that of the chemical-pharmaceutical industry, you start from raw materials. Intermediate products may be created and you will eventually have the final product. All these products, whether they are liquids or solids, have to be stored. This is done in tanks. To ensure the quality of the products and to avoid possible (dust) explosions, a nitrogen blanket is placed in the tank to avoid contact with oxygen.
In the past, the overpressure of the nitrogen blanket was measured to monitor inertia. It is of course better to measure the actual oxygen concentration.
Measure oxygen where it isn't
An oxygen analyser that can be used in stationary gas, requires little or no maintenance and responds immediately, is the best choice for this application. A Tunable Diode Laser (TDL) gas analyser is then ideal.
Simple oxygen sensors may also be used to monitor inertia. These sensors can be used especially in cases of high humidity or even condensing conditions.
The pressure in the tank or the differential pressure ensures that no air (with oxygen) is able to enter the tank. Of course, you do not know then how much oxygen there is in the tank and whether the pressure is indeed caused by nitrogen. Errors are therefore not excluded.