Determining Accuracy of a Calibration Gas Mixture

Paul Fry

In this article we will go over the different terms as they relate to the overall accuracy of a gas mixture.

Firstly, understand that “accuracy” is a general term which is actually made up of two components: Preparation Tolerance and Measurement Uncertainty

Read More
Topics: Gas Mixtures, Calibration Gases, Regulations and Standards

Understanding units of measure for specialty gas mixtures

Paul Fry


The compositions of gas mixtures are expressed in a number of different ways. These can change depending upon the mixture’s method of manufacture, the type of components within the mixture, the amount of each component, the process/analytical requirements, or simply the customer’s preference.

In each case the units of measure and the ratio of these units relative to each other are listed on the certificate provided by the manufacturer.

  • Gas mixtures are commonly certified using the following units of measure:

    • mol Moles
    • vol Volume
    • mg/g/kg Miligrams/grams/kilograms
Read More
Topics: Gas Mixtures

Specialty Gas Valves & Connectors for High Pressure Cylinders

Paul Fry

When purchasing a specialty gas mixture in a high pressure cylinder (HPC), it is important to understand that the valves and valve connections can differ from cylinder to cylinder.  This can be the case for the same type of gas or gas mixture.

Read More
Topics: Speciality Gas Theory and Applications, High Pressure Regulator Tips, Gas Mixtures, Regulations and Standards

Oxygen (O2): Gas Hazards & Occupational Health

Matt Shaw

Gas Chemical Details

Oxygen, the most abundant element in the earth’s crust is of great interest due to the fact that it’s essential in the respiratory processes of most living cells. It is found in both the air we breathe and the water we drink. In normal conditions oxygen is a colourless and odourless.

Read More
Topics: High Purity Gas, Gas Theory for Gas Detection Applications, Gas Mixtures, Gas Hazards, Gas Detection Standards

Chlorine Gas Calibration - Challenges for Gas Detection Instruments

Greg Shires

The process of gas calibration involves the testing and comparison of your gas detection instruments against some fixed reference value. The process includes using an accurate gas mixture as a reference and comparing it with the values provided by the instrument being tested. The cylinder mixture or device that produces the assigned correct value is known as the standard and it plays a vital role in all gas calibration.

Read More
Topics: Gas Theory for Gas Detection Applications, Calibration Gas Selection, Gas Mixtures, Calibration Gases