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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

Choosing your Gas Cylinder Size: The 112 Litre Solution

Greg Shires

For much of the past 25 years little had changed in the availability and selection of calibration gas cylinders/mixtures for gas detection applications. Manufacturers were happy to enjoy the profits of selling 58 litre cylinders for standard 4 gas (H2S/CO/CH4/O2) mixtures and single corrosive gas mixtures.

It was not until 2008 when CAC GAS & Instrumentation in partnership with Scientific and Technical Gases (UK) introduced a unique and customer-focused solution. The 112DA Cylinder.

This was the first disposable gas cylinder pressurize to 70 bar (1000psi) for use with gas detection instruments.  Prior to this, gas cylinders were pressurized to only 35 bar or less.   

This increased pressure provided the opportunity to double the gas volume in the same size cylinder giving customers, for the first time 112 litres of gas, in the same size cylinder as the 58 litre.  

The benefits were quickly realised and it became known as the 112 Litre Solution!

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Topics: Calibration Gas Selection

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

Calibration Gas Selection: What’s a "pentane equivalent" calibration?

Matt Shaw

Calibration gas selection is critical in the operation of any combustible gas detector.

A combustible gas detector will respond to a wide variety of ignitable gases and vapours. How the sensor responds is directly dependent upon which gas is selected to calibrate the instrument.

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Topics: Gas Theory and Applications, Calibration Gas Selection

Choosing Your Gas Cylinder Size - What You Need To Consider

Paul Fry

gas cylinders cac gas

There are a few factors to consider when choosing your gas cylinder size now that there is greater availablity in the market.

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Topics: Material Selection, Calibration Gas Selection

Calibration Gas Shelf Life: What You Need to Know

Paul Fry

The shelf life of calibration gases are varied. Every mixture will have a particular shelf life which is determined specifically for that product. 

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Topics: Gas Theory and Applications, Calibration Gas Selection

Which Calibration Gas: Methane or Pentane?

Greg Shires

Choosing the incorrect gas to calibrate your gas detectors will make the readings inaccurate and potentially unsafe. Here we explain which gas to use in order to ensure accurate and safe readings.

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Topics: Gas Theory and Applications, Calibration Gas Selection