Breadcrumb
Micro Portable Emission Measurement Systems
CE-CERT has performed research with our gaseous and PM/PN micro PEMS system for a very compact emission measurement application. The research utilizes NTK-spark plugs engine OBD sensors for gaseous emission measurements and a new PM/PN developed sensor. The PEMS system is equipped with an electrochemical zirconium sensor for measuring oxides of nitrogen (NO) and oxygen (O2) and an air-to-fuel ratio (AFR) sensor. The gaseous data is measured as a concentration and is time aligned with estimated exhaust flow for total mass reporting. All time alignment and flow weighting is performed as part of the post processor systems for both PEMS.
mini pems
The PM/PN measurement utilized charged particles for mass and number concertation reporting. The principle is based on the Pegasor measurement system and has been correlated to the gravimetric PM and CPC PN measurement systems. This system is relatively accurate and shows signs of deviation when particle surface area changes. This system is good for identification or where particle properties are known and corrections can be made compared to more traditional methods.
Let us help you with your search