Reading Your Calibration Gas Cylinder Label: An Overview
If you deal with calibration gas cylinders on a regular basis at your workplace, you should have a thorough understanding of the information on the label. This helps you take accurate measurements and maintain the safety of your work environment. We’re here to provide an overview of the information on a calibration gas cylinder label so you can understand what you’re reading.
Gas Identification
The first and most important piece of information on a calibration gas cylinder label is the gas identification. This section is usually located at the top or near the top of the label and identifies the gas or mixture of gases within the cylinder. The identification is typically chemical symbols or names, such as “CH4” for methane or “CO2” for carbon dioxide. Verify that the gas identification on the cylinder label corresponds with the gas you intend to use for your application.
Concentration
Calibration gas cylinder labels also provide information on the concentration of each gas in the container. The concentration is usually expressed in parts per million (ppm) or volume percent (%V/V). This data will help you confirm you’ve used the desired concentration for calibration. It also ensures the calibrated instrument can detect the gas at the specified levels.
Balance Gas
When reading your calibration gas cylinder label, take note of the balance gas, or the remaining gas in the mixture after accounting for the primary gases. The label will specify the balance gas type and its percentage in the mixture. This information will help you understand the potential interference from the balance gas in the calibration process. Then, you can account for it in your measurements.
Cylinder Pressure
You can also find the pressure specifications of your cylinder on the label. This information is typically represented in pounds per square inch gauge (PSIG) or bars. Confirm that the cylinder pressure is compatible with the equipment and regulators you use, as incorrect pressure settings may lead to poor calibration results, equipment damage, or safety hazards. Keep this in mind when buying your calibration gas cylinders.
Expiration Date
Many gases or gas mixtures in these cylinders have a designated shelf life. You’ll often find the expiration date on the bottom or side of the label. Never use expired gases for calibration, as they may no longer provide accurate reference values. Additionally, some gases may become unstable or hazardous as they approach their expiration date, so always check the label before using them.
Serial Number and Certifications
Each cylinder comes with a unique serial number, which is usually located on the side or bottom of the label. The serial number aids in traceability and helps you confirm the necessary documents, such as the cylinder data sheet, are available for reference. Additionally, the presence of UN or ISO certifications can help you make sure the calibration gas adheres to OSHA and NFPA safety and quality standards.