Storage
SCR systems are sensitive to potential chemical impurities in the urea solution, therefore the solvent is demineralized water. The solution is clear, non-toxic and safe to handle. However, it can corrode some metals and so must be stored and transported carefully.
DEF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system at a rate of 2% of diesel consumption volume (4-6% in Europe). This low dosing rate ensures long fluid refill intervals and minimises the tank's obtrusion into vehicle packaging space. An Electronic control unit adjusts the addition of fluid in accord with such parameters as engine operating temperature and speed.
Diesel Exhaust Fluid is offered to consumers through a variety of quantities by manufacturers ranging from containers of it for single or repeated small usage to bulk carriers for consumers that require a large amount DEF. It's recommended that it be stored in a cool, dry, and well-ventilated area that is out of direct sunlight.
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