Proper dilution and conditioning of exhaust emissions is essential to obtain accurate size distribution and particle number measurements. The TSI Rotating Disk Thermodiluter is highly regarded in the field of particle emission measurement, especially for sampling, diluting and conditioning exhaust from diesel and spark-ignition engines. And, it is compatible with a wide variety of TSI particle sizers and counters, including SMPS systems, EEPS spectrometer, CPCs, and the EAD. Combine the Model 379020A Rotating Disk Thermodiluter with a Model 379030 Thermal Conditioner Air Supply and a Model 3790 EECPC for solid particle number (PN) concentration measurements that are fully compliant with the EURO 5 specifications.