The OBS‑ONE PN Unit is a compact on-board emissions measurement device, engineered for real-world driving environments. It applies a condensation particle counter (CPC)—aligned with the UNECE Particle Measurement Program (PMP)—to continuously measure solid particle number concentration within a size range of 23 nm to 1,000 nm

Delivers regulatory-grade solid particle number measurement for certification and R&D workflows.

Compliance for Particle Counting

Eliminates bulky alcohol reservoirs—simplifies setup and reduces vehicle load.

Compact & Maintenance-Smart

Captures particle counts in tandem with mass airflow and ambient conditions for precise mass-based emissions analysis.

Data-Rich On-Road Measurement

Centralizes device management and data handling across OBS-ONE PEMS modules.

Integrated Control Ecosystem

OBS-ONE PN Unit

HORIBA provides innovative applications and insights, advanced automotive validation and verification technologies and equipment, and ongoing guidance and consultation to client partners across the globe. With 75 years of unmatched comprehensive scientific measurement and data management proficiencies. Our ever-expanding engineering expertise and ongoing innovations provide customers with complete vehicle development solutions that solve industry challenges. 
 

Mobility

MEXA-ONE offers an intuitive user interface with a highly efficient hardware and software design. This results in increased testing efficiency and economical facility operation, while enhancing reliability and accuracy. These advancements are possible because the MEXA-ONE software employs new "HORIBA ONE PLATFORM". This platform integrates the test devices in an emission cell into a single user interface, increasing efficiency and optimizing user control over the entire testing process.HORIBA Awarded “2012 Hardware Innovation of the Year Award” for MEXA-ONE Design.&nbsp; &nbsp;

MEXA-ONE

Laser Wavelength

Laser power for 532 nm

Laser power for 785 nm

Laser Power adjustment

< -25°C TE-cooling (from +20°C ambient)

Deep Cooled Camera

Type of Scientific Sensor

96 wells in < 1 minute (@532nm) @ 500 msec exposure time per well

Reading Speed

Plate Format

Self-calibration

Door

Server Control

Footprint

MEXAcube utilizes our proprietary technology, IRLAM™, to continuously support the development of internal combustion engines (ICEs) and meet new regulatory requirements for diversified fuels. It can measure CO, CO2, NO, NO2, N2O, NH3, HCHO, CH4, and THC with precision. By achieving approximately 80% lower power consumption compared to previous laboratory analyzers, it provides a sustainable and energy-efficient way to meet stringent regulations. Additionally, it supports exhaust gases from carbon-neutral fuels, such as hydrogen and ammonia, which contain high concentrations of moisture, contributing to the development of next-generation mobility.

MEXAcube

The OBS-ONE IRLAM unit is an on‑board emissions measurement system that analyzes NH₃ and N₂O under real‑world driving conditions. It integrates with the GAS and PN units to capture exhaust gas concentrations, flow rate, GPS location, and ambient conditions, supporting future regulatory development.

OBS-ONE-XL (IRLAM)

The MEXA‑584L is a lightweight (~4 kg), portable emissions analyzer that simultaneously measures CO, HC, CO₂ (NDIR) and AFR/Lambda at idle, with optional O₂, NO, RPM, and oil temperature monitoring. It features an intuitive icon LCD, simple calibration, durable sampling tube, and RS‑232C remote control/data logging for versatile field testing.

MEXA-584L

Portable Engine Exhaust Emission Analyzer

High-accuracy, high-resolution hydrogen gas analyzer designed to support the development of the hydrogen supply chain.&nbsp;Essential for the development of technologies necessary to produce, transport and use hydrogen and hydrogen related materials such as ammonia.&nbsp;HyEVO can be used for many applications in combination with other measurement devices.

HyEVO

The HyBOPS is a fully integrated, containerized test platform designed for hydrogen fuel cell systems and their Balance of Plant (BoP) components. It provides a modular, portable, and safe environment to perform endurance testing, performance validation, and component-level analysis—either on-site or via HORIBA’s dedicated hydrogen testing centers.

HyBOPS

The EVCM-ONE is a standalone monitoring station that integrates seamlessly with EV charging systems to measure electrical recharge energy according to WLTP range testing requirements. Designed for accuracy and regulatory compliance, it logs voltage, current, and energy consumption with advanced reporting and connectivity for vehicle testing environments.

EVCM-ONE

The SPCS-ONE is a portable and compact particle number (PN) measurement system engineered for real-time detection of ultra-fine particulate emissions—down to 10 nm (SPN10) or 23 nm (SPN23). It meets evolving regulatory standards such as Euro 7 and GB 7 and enables direct sampling of engine or vehicle exhaust without dilution, supporting both certification and R&amp;D workflows.

SPCS-ONE

The MEXA-ONE-XL-NX enables real-time, direct measurement of four nitrogen-containing exhaust gases—NO, NO₂, N₂O, and NH₃—using advanced infrared laser absorption modulation (IRLAM™). With superior sensitivity, broad dynamic range, and rapid response, it empowers both emission certification and R&amp;D under stringent regulatory standards.

MEXA-ONE-XL-NX

Laser Spectroscopic Motor Exhaust Gas Analyzer

The RealFlow is an on-vehicle ultrasonic fuel flow sensor that brings precision lab-grade measurement directly to the engine bay. Compact, lightweight, and orientation-agnostic, it enables real-time, highly accurate fuel consumption data under dynamic conditions in both R&amp;D and regulatory testing environments.

RealFlow

The STARS Automation platform is a high-performance, modular software foundation for test automation, data acquisition, and control across vehicle, engine, powertrain, emissions, battery, and fuel cell testing. Built on a real-time environment, it offers flexibility, scalability, and integration from component-level rigs to full vehicle testbeds.

STARS Software Solution

The OBS-ONE PM Unit is an on-board emissions measurement system designed to collect and measure particulate matter (PM) in real-world driving conditions. It uses a high-precision partial-flow gravimetric sampling method paired with real-time particle monitoring. A built-in venturi flow meter ensures accurate proportional sampling even during transient exhaust flow conditions.

OBS-ONE PM unit

The OBS‑ONE GS Unit is a portable on-board emissions measurement module—part of the OBS‑ONE PEMS family—designed for real-world vehicle testing. It captures key gaseous emissions (CO, CO₂, NO, NOₓ, NO₂, THC, CH₄), exhaust flow, ambient environment data (temperature, humidity, pressure), and GPS location for accurate mass emissions monitoring.

OBS-ONE GS Unit

The FTX‑ONE‑CL is a compact and fast-response FTIR (Fourier Transform Infrared) analyzer tailored for dilute-engine exhaust gas analysis. It measures up to 28 gas components—including nitrogen compounds, aldehydes, and alcohols—at a 5 Hz sampling rate, making it ideal for emissions R&amp;D and regulatory compliance.

FTX-ONE-CL

The PTFM-ONE DT is a standalone exhaust gas flow meter utilizing dual pitot tubes and ultra-fast 1 kHz pressure sampling. Engineered for high accuracy across full engine operating ranges and capable of withstanding extreme temperatures, it delivers comprehensive real-time flow measurement without compromising engine performance.

PTFM-ONE-DT

The PTFM-1000V2 is a standalone exhaust gas flow analyzer using the proven pitot tube measurement principle. With high-frequency pressure sampling (1 kHz), it accurately captures highly pulsating exhaust flows—including reverse flow—while offering real-time display and seamless integration with analyzer systems.

PTFM-1000V2

The MDLT-ONE is a compact partial-flow dilution tunnel designed for accurate particulate matter (PM) sampling from engine or vehicle exhaust. Using HEPA-filtered air and precise venturi flow meters, it dilutes exhaust streams and collects PM on filters, ensuring reliable measurement with a small footprint.

MDLT-ONE

The EXFM-ONE uses ultrasonic sensing technology to measure vehicle or engine exhaust flow rates in real time. It supports a wide dynamic range and fast response, making it ideal for mass emissions measurement when combined with gas analyzers or PM measurement systems. With an optional AFR analyzer, it can also evaluate fuel consumption on the fly.

EXFM-ONE

The CVS-ONE is a compact and high-performance constant volume sampler designed for capture of total particulate matter (TPM) from vehicle exhaust. It combines precise airflow control with integrated dilution tunnels, enabling accurate and repeatable TPM collection under real driving and testing conditions.

CVS-ONE

The FTX-ONE CS/RS is a compact, fast-response FTIR analyzer designed for direct measurement of engine exhaust gas. Equipped with a high-performance optical cell and multivariate analysis, it measures up to 28 exhaust gas components—such as NH₃, CO₂, and CH₄—at 5 Hz sampling rate using Fourier Transform Infrared technology.

FTX-ONE-CS/RS

FTIR Exhaust Gas Analyzer - Direct Measurement Type



The GIANT 5200 is a fully automatic, high-precision brake dynamometer tailored specifically for measuring brake dust emissions under standardized test cycles like WLTP. Designed within the proven GIANT 6000 series architecture, it delivers accurate brake particle analysis compliant with UN GTR No. 24 and the upcoming Euro 7 regulations.

GIANT 5200

Brake Dynamometer for Brake Emissions Testing

The HyFQ‑2000 series delivers highly accurate, real-time measurement of hydrogen fuel flow—ideal for both hydrogen combustion engines and fuel cell vehicles—supporting systems up to 500 kW. Employing Coriolis mass flow technology, it handles dynamic test profiles with precision while fitting easily into test cells thanks to its compact design.

HyFQ-2000

MEDAS-15 is a dynamic altitude simulator capable of reproducing a wide range of environmental conditions—including altitude, temperature, and humidity—in a compact, mobile design. It supports testing from component level up to full vehicle or powertrain systems, ensuring consistent and realistic performance evaluation without costly chamber installations.

MEDAS

STARS Battery is a powerful extension of the STARS Automation platform designed specifically for battery testing. It allows users to run and manage multiple simultaneous tests—from single cells to full battery packs—by integrating with BMS, cyclers, and environmental hardware. Ready-to-use test libraries and simulated devices accelerate setup while maintaining compliance with key standards.

STARS Battery

STARS Engine is a powerful and flexible automation platform tailored specifically for engine testing applications. It empowers engineers to conduct highly complex, real-time test sequences—from manual to fully automated—across both individual test stands and clustered networks for synchronized test operations.

STARS Engine

Test Automation Software for Engine Testing

STARS Powertrain builds upon the robust STARS platform to deliver automation tailored specifically to powertrain testing. Combining real-time control, high-speed data acquisition, and flexible configuration, it empowers engineers to orchestrate complex test sequences across engine dynos, transmissions, hybrid systems, and beyond with ease.

STARS Powertrain

Test Automation Software for Powertrain Testing

STARS VETS is a user-friendly automation solution within the STARS platform, tailored specifically for emissions testing on chassis, engine, and powertrain dynamometers. It streamlines test cycle execution, device control, result calculation, and compliance reporting—perfectly aligned with global standards including WLTP, RDE, and Euro 7.

STARS VETS

Test Automation Software for Emission Testing

Measuring Principles	Condensation particle counter (CPC)
Particle Diameter	23 ～ 1,000 nm
Measuring Range	0 ～ 5 × 10⁷ particles/cm³
Power Supply	DC 24 V
Power Consumption (MAX.)	Approx. 0.25 kW
Mass	Approx. 18 kg
Operating Condition	Temperature: -10 ～ 40 ℃, Altitude: 0 to 2,000 m above sea level, Relative humidity: less than 80% (No condensation)
Condensation fluid	Isopropyl alcohol a special grade reagent (99.5%) corresponded
Option	Outer cover for mounting outside the vehicle using a hitch carrier

OBS-ONE PN Unit

OBS-ONE PN Unit

Why Choose OBS-ONE PN Unit

Key Advantages of OBS-ONE PN Unit

Compliance for Particle Counting

Compact & Maintenance-Smart

Data-Rich On-Road Measurement

Integrated Control Ecosystem

Technical Specifications of OBS-ONE PN Unit

Related Products

MEXA-ONE

MEXAcube

OBS-ONE-XL (IRLAM)

MEXA-584L

HyEVO

HyBOPS

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