Purifilter (Passive Regeneration)

PurifilterTM from Engine Control Systems is an integrated diesel particulate filter and silencer, which efficiently removes particulate (PM) and gaseous pollutants, CO and HC. The filter particles (soot), are automatically burnt off (self regeneration) at exhaust temperatures from 280°C or higher.

PuriFilterTM is the first self regenerating particulate filter system based on Silicon Carbide (SiC), which offers superior thermal durability and extended service life. The advanced base and precious metal catalyst system not only lowers the balance point of the soot, but also provides an extremely high reduction of CO and HC.

When the exhaust passes through the micro-porous filter walls the soot particles in the exhaust are separated and collected. At the same time the catalytic coating oxidizes the gaseous pollutants of hydrocarbon (HC) and carbon monoxide (CO) to harmless carbon dioxide and water. The catalytic coating also lowers the ignition temperature of the soot to 280-380°C, depending on the composition of the soot and the conditions of the engine. The lowered ignition temperature starts an oxidation process that burns the collected soot automatically under normal operating conditions.
The filtration is so efficient that any debris passing through the engine combustion chamber will also be collected, (i.e. lube-oil ash, wear metals, intake air debris etc.)
This debris should be removed to prevent excessive build-up. The cleaning intervals will depend on the conditions of the engine and operating conditions.

Application
The PuriFilterTM is intended for permanent installation on vehicles and machines in heavy operation running regularly with exhaust temperatures reaching 280°C or higher. At lower temperatures the separated particles will be stored in the filter and increase back pressure. Idle periods should be kept to a minimum.

Exhaust temperature is dependent on a number of variables such as duty cycle, soot composition, make of engine etc. If a vehicles’s duty cycle is in question, data logging must be performed to ensure that PuriFilterTM will regenerate during the vehicle's current and normal operation

Efficiency
The PuriFilterTM effectively removes particulate (PM) and gaseous pollutants CO and HC from diesel exhaust and is also a silencer.
typical reduction*
Carbon monoxide (CO) 99%
Hydrocarbons (HC) 96%
Particulate (PM) 91%
Silencing >15 dB
*Tested according to ISO 8178
We recommend the use of Ultra - low -Sulpur Diesel (max 50ppm). Fuel containing higher levels of sulpur will reduce efficiency and shorten the maintenance intervals.