OBS-ONE PM unit

OBS-ONE PM - On-board Emissions Measurement

On-board Emissions Measurement System

On-board PM measurement for real-world results

OBS-ONE PM unit is the industry-leading on-board Particulate Matter (PM) measurement system. It collects PM on a filter paper, using a partial flow gravimetric sampling method, while simultaneously measuring real-time PM. A key feature of this design is the use of a venturi flow meter which enables reliable proportional sampling and accurate exhaust gas flow measurement under transient flow conditions. Combine the GAS unit and PM unit to perform certification tests on heavy duty and non-road vehicles.

Segment: Automotive

Division: Emission Measurement Systems

Manufacturing Company: HORIBA, Ltd.

EPA CFR part 1065 Compliance

For Certification

US EPA CFR part 1065 subpart J
Simplify data collection and post-processing regulation requirements by using this measurement method

For R&D

Easily compare in-lab test results with real-road test results
Support R&D by simulating real-world driving events in the test cell with the Test Automation System STARS

◎ The world’s smallest PM measurement system in its class*

*As of July 2015. Based on our company's research.

Easily mounted on any vehicle (modular and front access design)
One-touch fitting for module and cable connections

◎ The reliable test method for high speed flow rate control

PM transient measurement by proportional sampling

◎ User-friendly design mounts easily on any vehicle
(modular and front-access design)

One-touch fitting for module and cable connections
Cartridge filters are easily changed

Integrated Operation Software

OBS-ONE and other HORIBA ONE series measurement devices employ a common interface with future expandability. Control and management of each emission measurement device can be integrated into a single controller, as well as provide notifications of system health.

Measuring Principles	Batch sampling: Filter gravimetric method Real-time PM measurement : Diffusion charging method
Measuring Ranges (Real-time PM sensor)	0 to 2500 mm/cm³ (Concentration after dilution）
Dilution Method	Partial flow dilution method (Proportional sampling mode/Fixed dilution ratio mode)
Signal for Gas Sampling	Exhaust gas flow rate: Isolated analog signal (0-10 V)
Flow Rate of Diluted Gas	10 to 15 L/min (Under the conditions of 20 deg.C and 101.3 kPa)
Filter Holder	Diameter 47 mm, Effective diameter 26.2 mm (Without backup filter)
Particle Pre-classifier (Cyclone)	99% penetration of particle size of less than 1 μm 50% cut off point: particle size between 2.5 and 10 μm
Power Requirements	DC 24 V
Power Consumption	Max. 0.6 kVA
Dimensions	350(W) x 470(D) x 460(H) mm (Excluding controller and protruding objects)
Mass	Approx. 45 kg (Excluding controller)
Operating Conditions	Temperature: 0 to 40 deg.C (During operation) Relative humidity: less than 80%　　Altitude: 0 to 2000 m above sea level

System Configuration

Combination of PM measurement unit and GAS measurement unit

RDE Test with Portable Emission Measurement System (PEMS)

In 2016 the European Commission´s (EC) Member States agreed on new procedures and requirements for light-duty vehicle type approval certification introducing Portable Emission Measurement System (PEMS) for vehicle testing on the road.