Dales Super Store - DEF Injectors / Dosing Units

Diesel Exhaust Fluid (DEF) System - DEF Injectors / Dosing Units

Diesel Exhaust Fluid (DEF) injectors, integral components of Selective Catalytic Reduction (SCR) systems, are instrumental in reducing harmful nitrogen oxide (NOx) emissions from diesel engines.

Strategically positioned within the exhaust system, DEF injectors are typically located downstream of the Diesel Oxidation Catalyst (DOC) and upstream of the SCR catalyst. These electronically controlled injectors are precisely regulated by the Engine Control Unit (ECU), which relies on input from various sensors monitoring exhaust gas temperature, pressure, and NOx levels.

The primary function of DEF injectors is to deliver a precisely measured amount of DEF fluid into the exhaust stream. This fluid reacts with the NOx in the SCR catalyst, effectively converting it into harmless nitrogen, water (H2O), and carbon dioxide (CO2). NOx sensors located before and after the catalyst continuously monitor the NOx levels, ensuring optimal performance of the SCR system and compliance with emissions regulations.

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More About DEF Injectors / Dosing Units

DEF is a urea-based solution injected into the exhaust stream before it enters the SCR catalyst. DEF injectors precisely spray the DEF into the exhaust gases, enabling the conversion of harmful NOx emissions into harmless nitrogen and water vapor through a chemical reaction within the catalyst.

The injectors ensure accurate and efficient DEF delivery into the exhaust system, maintaining optimal conditions for the SCR catalyst to function effectively. Precise operation of the injectors is crucial to provide the correct amount of DEF in proportion to the exhaust gas flow, allowing for complete NOx reduction while minimizing DEF consumption.

Regular maintenance and cleaning of DEF injectors are essential to prevent blockages or malfunctions that could hinder the proper injection of DEF. Clogged or faulty injectors can lead to incomplete NOx conversion, increased emissions, and potential engine performance issues.