OBS-ONE GS Unit

OBS-ONE GS - On-board Emissions Measurement

OBS-ONE GS - Portable Emission Measurement

On-board Emissions Measurement System

Portable Emissions Measurement System for Real-World Testing

Obtaining valid emissions results under real-world driving conditions requires more than measuring exhaust gas concentrations. Engineers must coordinate exhaust-flow, vehicle, GPS and environmental data while monitoring test validity throughout the journey.

The OBS-ONE GS Unit is a Portable Emissions Measurement System (PEMS) for measuring gaseous emissions from light- and heavy-duty vehicles under real-road conditions. It measures CO, CO₂, NOx, NO₂ and, in selected configurations, THC while collecting exhaust-flow, vehicle-speed, GPS and environmental data to calculate mass emissions.

Designed for regulatory testing and engine and vehicle research and development, the system guides users through test preparation, quality checks, measurement, real-time validation and post-processing. Its modular configuration can be expanded with compatible OBS-ONE particle-measurement units and other sensors according to the testing application.

As part of HORIBA ONE PLATFORM, OBS-ONE provides a common operating environment for compatible HORIBA measurement systems. Centralized device control, system status, maintenance information, alarms and measurement data help simplify operation across real-road and laboratory testing.

OBS-ONE data can also be combined with drive-recording information and HORIBA’s STARS test automation system to reproduce real-world driving events in the laboratory, supporting repeatable engine, powertrain and chassis development.

Comprehensive Real-World Emissions Measurement

The OBS-ONE GS Unit combines the measurements required to calculate and evaluate gaseous mass emissions during on-road vehicle testing.

Measures CO, CO₂ and NOx
Supports NO₂ evaluation in selected configurations
Includes THC measurement in heavy-duty configurations
Measures or acquires exhaust-flow data
Records GPS position and vehicle speed
Monitors atmospheric temperature, humidity and pressure
Acquires exhaust temperature and pressure
Calculates mass emissions using synchronized measurement data
Supports light- and heavy-duty vehicle configurations

Real-Time Test Validation and Guidance

Invalid measurements can result in lost road-testing time and repeated test journeys. OBS-ONE helps users identify potential problems during the test instead of discovering them only during post-processing.

Guides users through preparation, measurement and post-processing
Performs system self-diagnosis and pre-test quality checks
Supports sensitivity calibration before testing
Monitors measurement data during the journey
Provides real-time validation and operator guidance
Allows the driver to concentrate on driving once measurement has started

Simplified Installation and Flexible Operation

Modular system for different vehicle and measurement requirements
Front-access design simplifies equipment access
One-touch fittings support module and cable connections
Suitable for installation on different vehicle types
Low power consumption supports extended road operation
Power exchange unit enables switching between battery, backup battery and AC power without shutting down the system

Reliable and Safe On-Road Testing

Designed to maintain measurement performance across changing temperature, pressure and vibration conditions
Uninterruptible power supply helps protect measurement data following an unexpected battery interruption
Emergency-stop function shuts down power and gas supply
Bottle-free LDV configuration supports safer vehicle installation
Optional OBS-ONE RE protection case supports heavy-duty and NRMM applications

Integrated with HORIBA ONE PLATFORM

OBS-ONE uses the same operating environment as compatible systems such as MEXA-ONE and CVS-ONE.

View and control compatible measurement devices from one display
Monitor complete system status during testing
Centralize maintenance information, alarms and system messages
Use consistent screen layouts and operating procedures
Support future expansion with additional pollutant and particle-measurement capabilities
Improve continuity between real-road and laboratory measurement systems
Discover how HORIBA ONE PLATFORM connects and manages laboratory measurement systems.

Data Post-Processing and Reporting

Calculates and evaluates results for light- and heavy-duty vehicle testing
Simplifies complex data-processing workflows
Generates reports for certification applications
Synchronizes measurement results with GPS information
Relates measured data to camera-recorded journey footage
Supports ASAM-ODS data handling

Connect Real-World Testing with the Laboratory

OBS-ONE measurement and drive-recording data can be used with STARS software to reproduce real-world driving events in a controlled laboratory environment.

Capture emissions and operating data during real-road testing
Reproduce road-derived driving events in the test cell
Compare real-road and laboratory emissions results
Support engine, powertrain, chassis and aftertreatment development
Improve repeatability when investigating real-world emissions behavior

Applications

Real Driving Emissions (RDE) testing
Portable Emissions Measurement System testing
Engine and vehicle certification under real-road conditions
U.S. EPA CFR Part 1065-related testing
Light-duty vehicle emissions measurement
Heavy-duty vehicle emissions measurement
Non-road mobile machinery testing with the appropriate system configuration
Engine, powertrain and chassis R&D
Exhaust aftertreatment evaluation
Real-world drive-cycle capture
Laboratory reproduction of real-world driving events
Correlation of real-road and chassis-dynamometer results

	LDV Type		HDV Type
	OBS-ONE -GS01	OBS-ONE -GS02	OBS-ONE -GS11	OBS-ONE -GS12
CO	●	●	●	●
CO₂	●	●	●	●
NO/NOx ^*¹	●	-	●	-
NO, NOx, NO₂^*2	-	●	-	●
THC	-	-	●	●
Exhaust Flow Rate	●	●	●	●
Power Requirements	DC 22〜28 V
Power Consumption (at stable state) ^*3	Approx. 0.2 kW		Approx. 0.45 kW
Dimensions^*4	Approx. W 350 × D 470 × H 330 mm		Approx. W 350 × D 470 × H 470 mm
Weight (Main unit)	Approx. 32 kg		Approx. 45 kg
Battery^*5	Deep-cycle, sealed lead battery of DC 24 V 35 Ah (5 hour rate), Operation time ： Approx. 3 hours		Deep-cycle, sealed lead battery of DC 24 V 100 Ah (5 hour rate), Operation time ： Approx. 4.5 hours
Operating Conditions	Temperature： -10 to 40 deg.C,^*6　Relative humidity： less than 80%, Altitude： 0 to 2000 m above sea level

Analyzers and Sensors

★NDIR ： Non Dispersive Infrared Detection
　CLD ： Chemiluminescence Detection
　FID ： Flame Ionization Detection

	Measurement Principle^★	Measurement Range
CO	Heated NDIR	0-0.5 to 0-10 vol%
CO₂	Heated NDIR	0-5 to 0-20 vol%
NO/NOx	Heated CLD	0-100 to 0-3000 ppm
NO, NOx, NO₂	Heated-dual CLD	0-100 to 0-3000 ppm
THC	Heated FID	0-100 to 0-10000 ppmC
Sampling Method	Wet measurement	-
Exhaust Fow Rate^*7	Pitot flow meter	0-2.0 to 0-65.0 m3/min
Standard Signal Measurements	Exhaust temperature, Exhaust pressure, Atmospheric pressure, Atmospheric temperature, Atmospheric humidity, GPS signal, Speed

*1 NO/NOx: Switchable measurement
*2 NO, NOx: Simultaneous measurement NO₂: Calculation of NO and NOx
*3 Length of heated inlet tube LDV type: 2 m, HDV type: 5 m, Atmospheric temperature: 20 deg.C
*4 Excluding handle and projection
*5 Nickel hydride battery is an optional unit.
*6 Please contact HORIBA if temperature is below 0 deg.C
*7 Exhaust flow rate can be taken by OBD interface unit

＜Option＞
・OBD interface unit： Supported ISO15765-4/J1939
・External input unit (EIU)： Analog voltage, Analog current, Thermocouple, Platinum resistance temperature detector, Frequency
・Power supply unit (PS)： Power supplied from AC to system
・Power exchange unit (PE)： Can be changed power supply without being powered off
・Heated bubbler unit: Humidifying unit for H₂O interference check and H₂O quenching effect check

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.

Real driving emissions with RDE CoDriver

Real Driving Emission (RDE) tests confirm the results produced during an emissions test on a chassis dynamometer to ensure that vehicles meet the set limits in the real world.

RDE Testing for Non-Road Mobile Machinery (NRMM)

After the introduction of Real Driving Emission (RDE) tests for light- and heavy-duty vehicles, focus is now also shifting to the area of non-road mobile machinery (NRMM).

Size: 2.07 MB

OBS-ONE Brochure English