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Engine Emissions Testing and Research

Engine EmissionsRegulators and researchers use TSI particle instruments for engine emissions research around the world. Our products help quantify and analyze particle emissions from light-duty and heavy-duty engines, for both on-road and stationary applications.

You’ll find TSI products used in the research and development of advanced internal combustion engines and after-treatment systems, like Diesel Particulate Filters (DPF) or Gasoline Particulate Filters (GPF). Our particle counters quantify the number concentration of aerosol particles. TSI particle sizers measure the size distribution of exhaust particles. 

Our instruments allow measurements at the tailpipe, from the Constant Volume Sampler (CVS), or from other partial flow samplers. TSI’s fast sizer spectrometers may also enable high time resolution mass measurements of engine exhaust particles.

Real-World Field Emissions Testing

TSI’s Nanoparticle Emission Tester 3795 (NPET) measures nanoparticles in combustion emissions. It is particularly useful for construction machinery, buses, and other vehicles under realistic use conditions. Free-measurement mode allows continuous measurements. Its test cycle is compliant with SR 941.242 and SR 747.201.3. These Swiss regulations apply to non-road mobile machinery and marine engines equipped with particulate filters, respectively.

The High-Concentration NPET 3795-HC measures upstream and downstream of Diesel or Gasoline Particle Filters, cold start emissions, or biomass combustion emissions. Its measurement capabilities go beyond the requirements of the Swiss regulations.

Customers use NPETs for driving tests, but they are also quick and effective tools to test after-treatment systems. As after-treatment systems age, small leaks from internal defects caused by thermal stress may occur well before warranty expiration. The NPET is sensitive enough to measure particle number as opposed to opacity. This means that it is capable of detecting elevated particle number concentrations caused by those small leaks. Enforcement agencies and shops using the NPET can easily identify high-polluting engines with defective after-treatment systems.

In addition to testing specific vehicles, agencies and researchers use TSI instruments for air quality studies in communities. By driving and deploying our counters and engine fast sizers, they can quantify particle concentrations and size distributions from emissions near streets, freeways, ports, and airports.

Engine Emissions Solutions


High-Concentration Emission Tester

High-Concentration Nanoparticle Emission Tester measures total solid particle number concentration.


Nanoparticle Emission Tester

Nanoparticle Emission Tester applications include engine exhaust research, DPF compliance, & more.


Engine Exhaust Particle Counter

The EECPC 3790A-10 helps customers meet Post Euro 6 regulations, UNECE R83 & R49.


Engine Exhaust Particle Counter

Satisfies UNECE R83 requirements and is a valuable tool for measuring particles in engine exhaust.


Engine Exhaust Particle Measurement

Measures the transient response of new engine designs with advanced emission control devices.

EEPS 3090

Particle Sizer Spectrometer

Measures the size distribution of engine exhaust particle emissions from 5.6-560nm.

PTT 3098

Porous Tube Thermodiluter

Sample conditioning system designed for the 3090 Engine Exhaust Particle Sizer.


Cascade Impactors

Collect particles from 10 nm-10 µm, in 3-13 different size fractions, and at flow rates of . . .