The MICRO-PSS is a particulate sampling system based on partial flow method and variable dilution. It is suitable for sampling exhaust gases from diesel engines in order to determine particulate emission level. The partial flow sampling method enables to use the MICRO-PSS with engines of any size, from small ones to big naval units. The device satisfies the specifications for evaluating the particulate in transient cycles as defined in ISO 16183 international standard.  MICRO-PSS is a stand-alone unit; the overall weight is less than 35 kg thus allowing the installation on running vehicles for in-use compliance tests. The system needs only 24 Vdc power supply and it is ready to run in a very short time.

MICRO-PSS is provided with low inertia mechanical flow-meters connected to variable-speed volumetric pumps.
This configuration allows to have a very low response time in transient conditions (transformation time lower than 0.20 seconds according with ISO 16183 procedure). Thank to this the system can be used with the “on line” control method thus avoiding to run pre-tests. The mechanical-type flow meters offer high stability and repeatability, so that calibration procedures need to be carried out only after long time from each other. Now MICRO-PSS can be equipped with a real time particulate sensor (PPM) that operates by electrostatic charging of PM particles. Once integrated and corrected with gravimetric measurement this signal can be used to determine the quantity of particulate collected on the filter second per second.

MAIN COMPONENTS

Advantages

- Simple to use
- Easy to transport for on-board vehicle testing
- No need of service fluids (air, water)
- Use in transient on-road cycles
- Independent of engine dimensions
- Low inertia and high stability mechanical flow meters
- Response time in transient conditions < 0.20 sec.
- Calibration before running the test is not necessary
- Complete SW management of Data
- Remote management from Host using AK protocol

Reference standards

ISO 8178
ISO 16183
Directive 2008/74/EC
Directive 2005/78/EC
Directive 2005/55/EC
Directive 2004/26/EC
EPA 40 CFR 1065

Dimensions

Weight

Pumps maximum flow

Flow meters accuracy

Transformation time (ISO 16183)

Standard regression correlation coefficient [R^²]

Dilution factor

Filter size

Dilution air filter

Power supply

650 x 500 x 350 mm

35 Kg

2 m^³/h

± 0.2% of reading

< 0.15 sec

> 0.98

constant or variable

47 mm

HEPA

24 Vdc, 0.4 kW