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General Rules for Designing Custom Gas Mixtures

Paul Fry

We are often asked for many different gases for the same applications. When possible, the required gases can be combined into the same cylinder to reduce the overall gas cost. When creating custom gas mixtures you must be aware of potential issues from mixing different compounds together.

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Topics: Gas Theory and Applications, Calibration Gas Selection

Issues with Liquefied Calibration Gas Mixtures

Paul Fry

Liquefied gas mixtures, or ‘liquid mixtures,’ are often used for calibrations where the application demands calibration with a ‘heavy’ or longer-chain hydrocarbon (see demystifying-hydrocarbon-gas-mixtures-in-non-refillable-cylinders). Liquid mixtures have the advantage of closely matching the product being analysed (e.g. stream gas), while also offering increased efficiency by allowing an increased number of calibrations with the same cylinder, when compared to a gaseous mixture.

While liquid mixtures do have significant advantages, there are some disadvantages to consider.

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Topics: Gas Theory and Applications, Calibration Gas Selection

Six Gas Detector Calibration in the Wastewater Industry

Greg Shires

Issues & Solutions for Calibrating a Six Gas Detector in the Wastewater Industry

Continuing improvements in workplace safety and the ongoing protection of workers within Industry is creating a new wave in the water/wastewater sector. Many organizations are moving towards measuring six (6) gases in sewage treatment and sewer lines throughout Australia.

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Topics: Gas Theory and Applications, Calibration Gas Selection, Gas Detection

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

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Topics: Gas Theory and Applications, 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
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Topics: Gas Theory and Applications

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.

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Topics: Gas Theory and Applications, Calibration Gas Selection, Gas Detection

The Effect of Poisons & Inhibitors on Gas Detection Instruments

Greg Shires

Catalytic Combustible Gas Sensors (Pellistors)

These gas sensors are affected by poisons and inhibitors. Catalytic combustible gas sensors are susceptible to a number of different compounds which can result in irreversible poisoning or reduce the sensitivity of the sensor to measure and respond to different gases. The nature of the poison could be physical- soot or other bi-products of combustion which block the pores in the bead or chemical with molecules forming strong bonds with the catalyst and reducing activity.

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Topics: Gas Theory and Applications, Gas Detection

Critical Considerations When Purchasing Gas Detection Instruments

Greg Shires
gas detection instruments

Gas detection instruments are life saving devices. This is why it is essential that you choose the best product to meet your specific application and working environment. Here are the critical issues to focus on when choosing your instrument to ensure you are buying the best product for your business. 

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Topics: Gas Theory and Applications, Gas Detection