CVS-ONE

Constant Volume Sampler for Diluted Vehicle and Engine Emissions

Accurate diluted-emissions measurement requires stable dilution flow, representative exhaust sampling and careful control of background contamination—particularly as regulated emission levels continue to decrease.

The CVS-ONE is a Constant Volume Sampler designed to dilute vehicle or engine exhaust with filtered air and support accurate emissions measurement over a defined test cycle. When combined with measurement systems such as MEXA-ONE, it supports the calculation of total mass emissions and fuel consumption for certification testing and engine, vehicle and aftertreatment development.

A wide selection of dilution-flow configurations, flexible bag-sampling options and separate main sampling lines allow the system to be configured for light-duty vehicles, engines, hybrid and plug-in hybrid vehicles, and different fuel types. Compact system architecture helps reduce the test-cell footprint while preserving the measurement performance required for low-emission testing.

As part of HORIBA ONE PLATFORM, CVS-ONE can be operated and monitored alongside compatible HORIBA measurement systems through a common software environment. This helps engineers coordinate equipment, monitor system conditions and manage measurement workflows from a centralized interface.

Accurate Diluted-Exhaust Sampling

CVS-ONE provides controlled dilution and representative sampling of vehicle or engine exhaust for emissions measurement and mass-emissions calculation.

CVS-ONE dilution system showing vehicle exhaust mixed with dilution air for bag sampling and emissions analysis.

Critical Flow Venturi flow control
Stable dilution-flow measurement throughout the test cycle
Configurations for different vehicle, engine and exhaust-flow requirements
Separate main sampling lines available for flexible system design
Supports integration with MEXA-ONE and compatible emissions analyzers
Suitable for low-emission measurement applications

Flexible Flow and Sampling Configurations

Different powertrains, test cycles and exhaust-flow ranges require different dilution and sample-storage arrangements. CVS-ONE can be configured to match the laboratory’s testing requirements.

Multiple dilution-flow configurations available
Maximum standard flow rates from 20 to 40 m³/min, depending on model
Optional specifications available for higher-flow engine applications
Manual single-venturi and automatic multi-venturi configurations
Heat-exchanger configurations available
Additional sampling bags can be installed after initial system installation
Supports a maximum of 20 bags, depending on configuration
Suitable for gasoline, diesel and alternative-fuel testing

Final flow capacity and system arrangement should be confirmed for each application.

Compact Design for Flexible Test-Cell Layout

Alt text: Compact CVS-ONE Exhaust Sampling Unit for installation in an emissions test cell. CVS-ONE reduces the space required for diluted-exhaust sampling equipment, giving laboratories more flexibility when planning new installations or updating existing test cells.

Up to 65% less system volume than previous HORIBA systems
Up to 70% smaller footprint
Compact Exhaust Sampling Unit design
Bag Sampling Unit can be integrated into the MEXA-ONE cabinet
Shorter connections between sampling and analysis equipment
Improved equipment accessibility and test-cell layout flexibility

The reduction figures depend on the system specification, including the Exhaust Sampling Unit and heat-exchanger configuration.

Low-Emission Measurement and Contamination Control

At very low emission levels, residual gas, sampling-line contamination and background conditions can significantly influence results. CVS-ONE includes functions intended to help engineers identify and reduce these effects.

Short gas-line arrangement between the bag-sampling unit and analyzers
Enhanced sampling-line purge functions
Automatic system blank or null testing
Historical management of system blank results
Water-monitor option to support dilution-factor selection
Low-concentration CO₂ measurement options designed to minimize water interference
System quality-check and performance-history functions
Optional automatic propane-check capability

Fuel-Consumption Testing for Hybrid Powertrains

CVS-ONE supports fuel-consumption evaluation for vehicles whose engines may start and stop repeatedly during a test cycle.

Supports hybrid and plug-in hybrid vehicle testing
Bag sampling can be coordinated with engine operating conditions
Supports up to five bag pairs for continuous testing, depending on configuration
Measurement results can be evaluated with compatible analyzer and automation systems
Quality-check history supports ongoing verification of system performance

Flexible Bag Sampling for Complex Test Cycles

Configure bag combinations according to the test procedure
Add sampling bags after system installation
Support multi-phase and extended test cycles
Coordinate bag sampling with vehicle or engine operating states
Store diluted-exhaust samples for subsequent concentration analysis

Integrated with HORIBA ONE PLATFORM

HORIBA ONE PLATFORM Logo

CVS-ONE uses the same operating environment as compatible HORIBA ONE Series measurement systems.

Operate CVS-ONE and compatible emissions analyzers from one interface
View sampling-system and analyzer status from a centralized display
Monitor system conditions, alarms and operational messages
Support measurement preparation and system quality checks
Apply more consistent operating procedures across test cells
Expand the measurement system as laboratory requirements evolve
Integrate CVS-ONE into broader emissions measurement and test-automation workflows

HORIBA ONE PLATFORM provides a common environment for equipment operation, system monitoring, maintenance information and laboratory expansion. Integration capabilities depend on the selected equipment and system configuration. Learn more about HORIBA ONE PLATFORM.

HORIBA ONE PLATFORM measurement screen for operating CVS-ONE with MEXA-ONE.

HORIBA ONE PLATFORM System View showing the operating condition of connected emissions measurement equipment.

Applications

CVS-ONE supports diluted-exhaust measurement across a range of certification and development programs.

Light-duty vehicle emissions testing
Engine emissions testing
Chassis-dynamometer emissions measurement
Gasoline and diesel powertrain testing
Alternative-fuel vehicle and engine testing
Hybrid Electric Vehicle (HEV) testing
Plug-in Hybrid Electric Vehicle (PHEV) testing
Fuel-consumption measurement
Low-emission vehicle testing
Exhaust aftertreatment development
Multi-phase certification test cycles
Research and development of engines, vehicles and emissions-control systems

Regulatory Testing

CVS-ONE can be configured to support vehicle and engine emissions testing conducted according to applicable regional procedures. Required flow range, bag configuration, sampling arrangement, analyzers and automation should be selected according to the applicable regulation and vehicle or engine category.

CVS-ONE is available in multiple configurations to accommodate different dilution-flow requirements, sampling arrangements and test-cell layouts. Select the appropriate model based on the required maximum flow rate, heat-exchanger configuration and mixing-tee arrangement.

Final system specifications depend on the selected configuration and testing requirements. Please contact HORIBA for assistance selecting the appropriate CVS-ONE model.

Models		CVS-ONE -SV	CVS-ONE -SV-HE	CVS-ONE -MV	CVS-ONE -MV-HE
Flow control		Critical Flow Venturi (CFV)
Flow rate changing		Manual (Single-Venturi System)		Automatic (Multi-Venturi System)
Maximum flow rate ^※1		20 m³/min	20 m³/min	30 m³/min	30 m³/min	40 m³/min
Heat Exchanger		-	●	-	●	●
Integrated Mixing Tee		●	-	-	-	-
Dimensions Mass	Exhaust Sampling Unit (ESU)	655(W) × 855(D) × 1970(H) mm				1310(W) × 855(D) × 1970(H) mm
	Exhaust Sampling Unit (ESU)	Approx. 350 kg		Approx. 400 kg ^※2	Approx. 500 kg	Approx. 800 kg
	Bag Sampling Unit(BSU)	To be integrated in the MEXA-ONE cabinet
Environmental conditions	Temperature	5 to 40 deg.C
	Humidity	80％ or less as relative humidity
	Atmospheric pressure and altitude	80 to 105 kPa (Up to 2000 m above sea-level) ^※3

※1 Contact HORIBA regarding optional configurations, including higher flow rates for heavy-duty engine applications.
※2 Mass shown for systems without an integrated mixing tee.
※3 Operation at lower atmospheric pressures from 80 to 93 kPa—approximately 700 to 2,000 meters above sea level—must be specified as an optional configuration when ordering.

Optional Equipment

Optional equipment is available to support heated sample storage, system calibration and quality-control procedures.

Heated Bag Cabinet (HBC): Maintains heated sample bags for applications requiring controlled sample temperatures.
Flow Calibration Unit (SAO): Supports verification and calibration of CVS flow measurement.
Propane Check Unit (CFO-202): Supports automated propane-check procedures for evaluating hydrocarbon recovery through the sampling system.

Optional equipment availability and compatibility depend on the selected CVS-ONE configuration

Size: 2.14 MB

CVS-ONE Brochure English