Specialty gases, industrial gases and gas handling equipment from Air Liquide

Proficiency Testing Services from Air Liquide

Products and Services

Air Liquide offers pure and mixed gases as well as gas handling equipment and related services for nearly every application imaginable. Developing custom products is our specialty.

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Proficiency Testing Services

Air Liquide provides a unique opportunity to confirm your laboratory analytical results by comparing your measurements with other independent, participating laboratories in a global community. Formerly known as our Global Cross Reference Services™, Proficiency Testing Services from Air Liquide empowers you to achieve a higher degree of confidence in the accuracy of your laboratory analyses, and also helps you identify potential problems in the accuracy of those analyses.

Benefits of Participation

Improves credibility of your analytical laboratory capabilities
Identifies potential analytical problems confidentially
Provides inter and intracompany quality assurance
Cross reference gas mixtures can be retained as high-confidence master calibration standards

How Our Proficiency Testing Services Work

Step 1: Air Liquide creates identical unknown mixtures

We use our ACUBLEND™ or GRAVSTAT™ proprietary blending processes to produce a homogeneous batch of gas cylinders quarterly, then analyze them against NIST-traceable standards. As a subscriber to our service, one of these gas cylinders is sent to you for analysis. For example, if you subscribe to our low level Nitric Oxide Service, you would receive a mixture whose concentration falls between 5 and 50 ppm but would arrive at your door as an unknown.

Step 2: Participants analyze the unknown gas mixture and report findings to Air Liquide

A standardized Field Analysis Form is supplied with each gas cylinder for this purpose.

Step 3: Air Liquide reports analytical results to all participants

We provide a report summarizing the analytical results for all participants (listed by code number or by the name of your organization, whichever you prefer). Report information includes mean and median concentrations, method of analysis, and statistical data such as variance mean, standard deviation and coefficient of variations. You keep the gas mixture for use as a high-confidence calibration gas standard.

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BTU Natural Gas Cross Reference

BTU value: 990 – 1030 range

n-Butane
C5
C6
Carbon Dioxide
Ethane

Isobutane
Methane
Nitrogen
Propane

Cylinders are prepared using our proprietary GRAVSTAT™ process. Components and range of samples are stated, the concentration is not. Tell me more about available concentrations.

CO2 Cross Reference Program

This program was developed primarily to meet the needs of the beverage industry. Tell me more about this program.

Constant Volume Sampling (CVS)

Applications: diluted automotive exhaust; in-plant air monitoring.

Carbon Dioxide: 0.5 – 2.5%
Carbon Monoxide: 5 – 500 ppm
Propane: 5 – 50 ppm
Balance: Blended air, HC

Custom and Proprietary Programs

Upon request, Air Liquide will provide custom collaborative services, designed and managed by us to meet government or industrial quality assurance and auditing needs. Tell me more about this program.

Diesel Exhaust/Turbine Exhaust

Applications: Diesel exhaust and turbine exhaust. The oxygen concentration is provided with each quarterly sample.

Carbon Dioxide: 2 – 10%
Carbon Monoxide: 10 – 6000 ppm
Oxygen: 18 – 22%
Propane: 5 – 500 ppm
Balance: Nitrogen

Ethylene (Polymer Grade)

Applications: Ethylene production; quality assurance for multiple locations; ethylene pipeline input/output quality assurance; and polymer plant raw material analysis.

Acetone
Ammonia
Carbon Monoxide
Dimethyl Disulfide
Hydrogen

Methanol
Nitrogen
i-Propyl Alcohol
Propylene

Gas cylinders are prepared using our proprietary GRAVSTAT process. Tell me more about available concentrations.

High Nitric Oxide and NOx

Applications: high level for diesel exhaust; industrial source monitoring.

Nitric Oxide: 100 – 2000 ppm
Balance: Nitrogen

Low Nitric Oxide and NOx

Applications: low level for auto exhaust; industrial source monitoring; stationary turbines.

Nitric Oxide: 5 – 50 ppm
Balance: Nitrogen

Oxygen

Applications: Standardized for combustion analyzers; diesel exhaust measurements; biological applications.

Oxygen: 1 – 21%
Balance: Nitrogen

Sulfur Dioxide

Applications: Stationary source emissions

Sulfur Dioxide: 25 – 5000 ppm
Balance: Blended Air

TO14/15 Cross Reference Program

This program was developed to respond to the various organizations that are formulating criteria for which laboratories may become accredited for air analysis. Our toxic organic program is conducted in conjunction with our partners, Environmental Resource Associates, for Federal, state and private laboratories. This continues to expand in support of lab accreditation guidelines. Tell me more about TO14/15 Cross Reference program.