OBS-ONE GS Unit
On-board Emissions Measurement System
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.
Why Choose OBS-ONE GS Unit
Regulatory-Compliant Gas Measurement – Measures critical exhaust gases needed for certification and RDE testing.
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Robust In-Field Operation – Built to perform reliably under diverse temperatures, altitudes, vibrations, and shocks.
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Fast, Accurate Response – High precision (±0.3% of full scale or ±2% of reading) with rapid reaction times.
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Unified System Control – Integrates into the HORIBA ONE software platform for streamlined control across OBS‑ONE series.
Key Advantages of OBS-ONE GS Unit
Comprehensive Emissions Capture
Provides a full suite of gas measurements required for heavy-duty and light-duty testing.
Field-Hardened Performance
Ensures accuracy in real-world driving, including harsh conditions and sudden temperature or altitude changes.
Quick & Precise Dynamics
Delivers real-time monitoring with high fidelity during driving cycles.
Seamless Integration
Fits into a unified testing environment shared with other OBS‑ONE modules for convenient operations.
Technical Specifications of OBS-ONE GS Unit
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
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