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šŸŒ How BlueD+ Works (AUS32 & AUS40)

BlueD+ (AUS32 and AUS40) is used in engines equipped with SCR – Selective Catalytic Reduction systems.
SCR is an advanced emission-control process designed to significantly reduce NOx (nitrogen oxide) emissions from diesel engines.

Whether it’s Euro 4/5/6 trucks on the road or marine engines at sea, the process works the same way:

šŸ”µ 1. Injection Into the Exhaust

BlueD+ fluid is not added to the engine or fuel.
Instead, it is injected into the hot exhaust stream before the SCR catalyst.

  • AUS32 → for trucks, buses, machinery with SCR

  • AUS40 → for marine engines & large industrial diesel systems with SCR

šŸ”µ 2. Conversion Into Ammonia

The heat of the exhaust breaks down the urea solution into ammonia (NHā‚ƒ).

  • AUS32 = 32.5% urea

  • AUS40 = 40% urea
    Higher urea concentration in AUS40 suits the higher exhaust flow of marine engines.

šŸ”µ 3. NOx Reduction Inside the SCR Catalyst

Inside the SCR catalyst, ammonia reacts with harmful NOx gases.

NOx + NHā‚ƒ → Nitrogen (Nā‚‚) + Water Vapour (Hā‚‚O)

These are harmless and naturally found in the earth’s atmosphere.

This chemical reaction results in:

  • Up to 90% NOx reduction

  • Cleaner emissions

  • Compliance with Euro 4, 5, 6 & IMO Tier III standards

šŸ”µ 4. Continuous Monitoring by Sensors

Modern SCR systems use:

  • NOx sensors

  • Temperature sensors

  • Pressure sensors

  • DEF dosing control modules

These ensure:

  • Correct injection amount

  • Maximum emission reduction

  • No ammonia slip

  • Engine protection

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