SCR (Selective Catalytic Reduction) Emission Control Systems
SCR Emission Control Systems
Selective Catalytic Reduction (SCR) is a proven and widely used technique for cutting harmful emissions from diesel engines. At SST Sensing, we provide liquid level switches specifically engineered for Diesel Exhaust Fluid (DEF) tanks, commonly known as AdBlue. These sensors are designed to trigger visual or audible alerts when DEF levels become critically low.
Our level switches deliver a dependable method for monitoring DEF in SCR systems. When fluid drops below a predefined threshold, our switches activate an alert system to notify the driver—supporting consistent compliance with emissions legislation.
SCR systems work by injecting DEF, an automotive-grade urea solution, into the exhaust stream of diesel-powered vehicles. As this mixture passes through a catalytic converter, it reacts with exhaust gases and converts harmful Nitrous Oxide (NOx) into harmless nitrogen, water vapour, and small amounts of carbon dioxide.
This process can reduce NOx emissions by as much as 90%, making SCR an essential emissions-reduction solution across numerous industries. It’s widely implemented in heavy-duty road vehicles, off-road machinery, and marine vessels including ferries, tugboats, and cargo ships.
The United States stands out as a frontrunner in SCR implementation. When the Environmental Protection Agency (EPA) introduced stringent diesel emissions regulations in 2010, fleet operators not only met compliance targets but also reported unexpected fuel economy gains of 3–5% in SCR-equipped trucks.
Given how critical DEF is to maintaining compliance, many diesel vehicles now feature systems that prevent engine start-up when DEF levels are too low—ensuring emissions limits are consistently met.
With global environmental policies becoming increasingly strict, cities are imposing greater restrictions on high-emission vehicles. This places even more emphasis on robust DEF level monitoring to ensure access, performance, and legal compliance.
