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Portable Nanoparticle Measurement and Monitoring System


Portable Emissions Measurement System





MD19-3E Raw Gas Diluter

ASET15-1 Evaporation tube and secondary diluter for the removal of volatile particles from a dilute exhaust sample

CU-2 Data Acquisition Unit


REXS: Reproducible EXhaust Simulator





Testo's NanoMet3 portable solid particle counter is a general-purpose counter that detects airborne particles down to 10 nm. It provides highly accurate measurements over a wide concentration range. As a result, this portable solid particle counter is quite versatile and well-suited for a broad range of applications.

DiSCmini Particle Counter

High-profile nanoparticle measuring equipment for automotive, laboratory and ambient applications









The all new DiSCmini is a portable sensor for the measurement of particle number and average diameter, based on the electrical charging of the aerosols. The small size of the DiSCmini handheld makes the instrument particularly suitable for personal carry-on measurement campaigns.

Negative health effects due to nanoparticles appear to correlate particularly well with number concentration or surface. Epidemiological and toxicological studies are still mainly based on total mass, or they use fuzzy proxies like "distance from a busy road" to describe personal exposure, although the health-related effects of particle number concentration are well known. We believe that this contradictory situation is due to the lack of adequate sensors on the market.

This gap is now closed with Matter Aerosol’s handheld version of the “Diffusion Size Classifier”, DiSCmini.  The DiSCmini is a portable sensor for the measurement of particle number and average diameter with a time resolution of up to 1 second (1 Hz). The simultaneous capture of number concentration and particle size allows the specification of other characteristic parameters, such as the particles surface (Lung Deposited Surface Area, LDSA). The instrument is battery powered with a lifetime of up to 8 hours; data can be recorded on a memory card, and transferred to a external computer via USB cable.

DiSCmini is particularly efficient for personal exposure monitoring in particle-loaded work space with toxic air contaminants such as diesel soot, welding fumes, or industrial nanomaterials.

DiSCmini is based on the electrical charging of the aerosols. Positive air ions generated in a corona discharge are mixed with the aerosol. The charged particles are then detected in two stages by electrometers. The first detector stage is a pile of steel grids; small particles will preferably deposit on it by diffusion. The second stage is a high-efficiency particle filter which captures all the other particles. The mean particle size can be obtained by analysis of the two currents measured on the stages. The particle count is determined with the total current. DiSCmini detects particles ranging in size from 10 to about 500 nm, while the modal value should lie below 200 nm. The concentration range is from about 1'000 to over 1'000'000 particles per cubic centimetre. The accuracy of the measurement depends on the shape of the particle size distribution and number concentration, and is usually around 10-15% compared to a reference CPC. The unit should be serviced and calibrated once a year.

Unlike other instruments DiSCmini needs neither working liquid of any kind nor radioactive sources. Therefore, it can be operated in any position and over extended periods without requiring a liquid refill. Typical applications include the determination of personal exposure in particle-loaded jobs (diesel soot, welding fumes, industrial nanomaterials) or in vulnerable groups (asthmatics, COPD patients). The development of large area survey grids of ambient air is becoming possible. The small size of DiSCmini makes the instrument particularly suitable for personal carry-on measurement campaigns. The high measurement frequency of 1 Hz allows the instrument to monitor rapid changes in the aerosol. This feature is particularly interesting to local or defined sources of particle generation. The equipment is designed for situations and applications where quick and easy access to particle number concentration and average diameter is desired.

Evaporation tube and secondary diluter for the removal of volatile particles from a dilute exhaust sample

ViPR: Testo's Patented Real-Time Solid Particle Counter for Engine Exhaust

The ViPR consists of hot dilution and thermo dilution, the exhaust gas sample is transferred from the diiluter to the evaporation tube. From the evaporation tube, all remaining volatile components are cycled into the vapor phase. Immediately following this phase, a cold dilution (according to the PMP recommendation) allow to detects and counts all particles using a condensation particle counter (CPC).

In June 2007, the European Commission drafted the final form of the Euro 5B / Euro 6 vehicle type approval regulation. Among numerous other novelties, the Euro 5b regulation introduces an additional counting method of solid particles. This new Number count method involved using the number of particles emitted from light-duty diesel vehicles as another regulatory metric. The number-based emission limit is to be enforced as soon as September 2011.

Testo (formerly Matter Aerosol) provided a significant contribution to the development initiative of the above limit value by providing the first solid particle counter, which was later dedicated to the PMP program R-83. This industry-dubbed ‘Golden Instrument’ was developed using the expertise of over ten years.

Our product line is fully PMP compliant with stand-alone modules ready to be used in applications other than car emission. Matter Aerosol’s Solid Particle Counter ViPR is composed of four different modules; the first diluter (PND1), thermo diluter (PND2), data acquisition unit, and the CPC Particle Counter (PNC).

The ViPR flexibility allows you to proceed with a regulatory PMP measurement campaign from a CVS tunnel or a raw gas sample from the engine tailpipe. Furthermore, DPF (Diesel particle filter) post-treatment efficiency can also be evaluated by upstream and downstream sampling of exhaust gas. The rugged rotating disk technology also maintains a stable dilution factor over several months, eliminating the need for regular linear checks.

- Rotation dilution technology (stable dilution ratio)
- Complies with all PMP (Particle Measurement Program) requirements and UNECE-R83
- Robust and precise dilution system without particle size dependency
- Can be used for engine test bed and car chassis dynamometer tests
- Highly accurate measurements due to immediate dilution at the sampling point


CU-2 Data Acquisition Unit

Data aquisition unit CU-2 - Every instrument should have an easy way to store data and organize the information collected during testing and measurement programs.The CU-2 data acquisition unit uses AK protocol. The ViPR has 4 different controlle mode: AK Host Remote Control Mode, Remote Computer Software Control Mode, Software Control Mode and Manual Operation Mode. 

AK Host Remote Control Mode - the particle number measurement system can be integrated in a test rig. The CU-2 Digital Control Unit can be controlled by a host computer connected by serial RS232 port or Ethernet connection. Communication protocol is AK over TCP/IP or RS232. A second host computer can be connected via Ethernet optionally.

Remote Computer Software Control Mode - The system can be controlled by a remote-desktop connection.
Software Control Mode - In software control mode, the system is operated via NanoMet software user interface.

ASET15-1 Thermodiluter 

The thermodiluter ASET15-1 - Evaporation tube and secondary diluter for the removal of volatile particles from a dilute exhaust sample. During dilution and cooling of vehicle exhaust, e.g. in a CVS tunnel, vapors of volatile material condense into nanodroplets, which distort the measurement of nanoparticles. ASET15-1 bounces volatiles back into the vapor phase and helps to keep the measurement easy and significant. A free adjustable dilution from 1 to 10 free adjustable range and the adequate temperature drop allows to use our system with a regulated CPC or SMPS or eventually any other instrument.

MD19-3E Raw Gas Diluter

MD19-3E (PND1) - The new MD19-3E is a re-engineered diluter. It keeps all advantages which a rotary diluter system brings with, the dilution ratio ranging from 1:15 up to 1:3000. Accurate dilution of aerosols usually requires precise and stable mass flow control, specially if large dilution ratios and ranges are requested. Our newly improved and long time proven rotating disc method of dilution avoids several problems of the conventional dilution technique such as frequent weekly linear checks or nozzle clogging.The mobile dilution head method allows to dilute the nearest possible to the aerosol source. This flexibility in the probe intake saves costly add-ons to avoid particle coagulation. A PMP compliant cyclone is optionally delivered with a regulated 2.5 μm cut off cyclone.

REXS: High Mass Soot Generator

REXS: Reproducible EXhaust Simulator – generates nano-sized soot particles which are very similar to diesel soot. But unlike soot from a diesel engine, REXS soot is consistent time after time. Going this artificial route can reduce cost of ownership by as much as 80% compared to the traditional method of using exhaust from a real combustion engine.
A complex and delicate machine is costly and prone to downtimes. REXS was built to avoid such problems: it is durable, robust, and easy to use with very little training. The design and quality are what one would expect of a reliable, accurate instrument made in Switzerland. Built-in safety features include an automatic ignition and an emergency shut-off option. The system is prevented from operating should any parameter stray outside of the set tolerances. It complies with strict health and safety regulations governing thermal, gas and electric shock hazards.

REXS holds down the cost of testing by simulating exhaust from a real engine – yet without a driver, or brakes and other expensive parts that wear out. It is also more economical on fuel. One customer estimates that REXS saves around CHF 40'000 on test bench costs every month. DPF filter loading times are the fastest on the market using particles of this size.


REXS is based on a gas fuel burner whose mass output can be varied to adjust the particle size at a given backpressure. Applications of the HiMass REXS include quality control, testing of filter materials, DPF loading and CVS calibration.