Page 153 - Praxair - Specialty Gases and Equipment Reference Guide

Engine Emissions

Mobile Source Emissions

Mobile Source Emissions Standards
Federal, Provincial and State vehicle emission regulations A wide range of high purity gases and calibration standards,
require certification of tailpipe emissions to prescribed blended to the manufacturers exacting specifications,
levels. These regulations mainly deal with in-use certification are available.
for currently owned and licensed on-road vehicles. In-use testing is traditionally referred to as Inspection
High pressure precision gas mixtures, in various and Maintenance (I/M) testing. I/M automotive calibration
concentrations, are also supplied to original equipment standards are referred to as “BAR” mixtures, and are
manufacturers for new engine certification of internal defined by the California Bureau of Automotive Repair.
combustion engines (ICE).

BAR Certified I/M Automotive Calibration Standards

Mixture Carbon Carbon Propane Nitric Balance BAR Analytical
(Praxair Part Number) Dioxide Monoxide Oxide Gas Blend Code Uncertainty
BAR-90 Low 6.0% 1.0% 300 ppm N/A Nitrogen 11 ± 2%
(1)
(MS BAR90L-D7)
BAR-90 Mid 12.0% 4.0% 1,200 ppm N/A Nitrogen 12 ± 2%
(1)
(MS BAR90M-D7)
BAR-97 Low w/NO 6.0% 0.5% 200 ppm 300 ppm Nitrogen 32 ± 1%
(2)
(MS BAR97LNO-D7)
BAR-97 Low 6.0% 0.5% 200 ppm N/A Nitrogen 31 ± 1%
(2)
(MS BAR97L-D7)
BAR-97 High w/NO 12.0% 8.0% 3,200 ppm 3,000 ppm Nitrogen 35 ± 1%
(2)
(MS BAR97HNO-D7)
Engine Emissions
BAR-97 High 12.0% 8.0% 3,200 ppm N/A Nitrogen 34 ± 1%
(2)
(MS BAR97H-D7)
BAR 97 Zero Air
Mixture Total Carbon Carbon Nitric Oxygen Balance BAR
(Praxair Part Number) Hydrocarbons Monoxide Dioxide Oxide Gas Blend Code
BAR-97 Zero Air < 1 ppm < 1 ppm < 1 ppm < 1 ppm 20.9% Nitrogen 37
(MS BAR97ZA-D7)
BAR-97 Zero Air < 1 ppm < 1 ppm < 1 ppm < 1 ppm 20.9% Nitrogen 45
(MS BAR97ZA-AS) (3)

Listed are the most commonly used mixtures. Please contact your (1) Labeled at the nominal (listed) concentrations.
Praxair Sales Representative for additional BAR certified mixtures. (2) Labeled at the analyzed concentrations.
Mixtures with a D7 suffix in the part number are supplied in single use, (3) High pressure aluminum AS cylinder available for
low pressure transportable cylinders. operational savings.

D•152 1-877-PRAXAIR www.praxairdirect.com