Complete Selection of Calibration Gas & Equipment


Calibration Gas Shelf Life

Do Calibration Gases Have a Shelf Life?
Calibration is a vital and necessary step to ensuring the proper performance of any gas detector. The calibration process requires use of a known concentration of gas, also known as span gas or calibration gas. Use of incorrect or expired calibration gas can result in improper calibration. Shelf life is determined by whether the calibration gas is a reactive or non-reactive gas.

gasdyn_74lr.jpgReactive Gas Mixtures
Reactive gas mixtures are calibration gas mixtures that include at least one gas component, which is classified as reactive. This is a broadly used term for chemicals that have some instability under certain conditions, and may react with certain materials, moisture, oxygen, or other chemicals. Reactive gas mixtures include mixtures containing Ammonia (NH3), Chlorine (Cl2), Hydrogen Chloride (HCl), Hydrogen Cyanide (HCN), Hydrogen Sulfide (H2S), and Sulfur Dioxide (SO2) among others. Reactive gas mixtures are produced in an aluminum cylinder that has been treated using our proprietary process to minimize reactivity with the reactive gas. Reactive gas mixtures typically have a shelf life of one year or less. After the shelf life has expired, it is likely that the concentration of the reactive gas will either have decreased or dropped-out all together.



Non-reactive Gas Mixtures
Non-reactive gas mixtures are calibration gas mixtures that do not include any reactive gases. This is a broadly used term for chemicals that are stable under most conditions, and are not affected by moisture, oxygen, or other chemicals. Non-reactive gas mixtures include mixtures containing hydrocarbons [Methane (CH4), Pentane (C5H12), Propane (C3H8), Hexane (C6H14), Isobutylene (C4H8), etc.], Nitrogen (N2), Hydrogen (H2), Carbon Monoxide (CO) and Carbon Dioxide (CO2) among others. Non-reactive gas mixtures are produced in a steel cylinder. Non-reactive gas mixtures have a shelf life of three years.

Shelf Life For All Cylinders
The shelf life for a cylinder is Gas Dynamics warranty period. Below is a list of the shelf life of Gas Dynamics gas mixtures. As a general rule, all steel cylinders have a 3-year shelf life while aluminum cylinders range from 6-12 months.

Product Shelf Life

Component Shelf Life (Months)
Ammonia (NH3) 18 Months
Benzene (C6H6) 48 Months
Carbon Dioxide (CO2) 48 Months
Carbon Monoxide (CO) 48 Months
Chlorine (Cl2) 12 Months
Ethylene Oxide (C2H4O) 12 Months
Refrigerants 48 Months
n-Hexane (C6H14) 48 Months
Hydrogen (H2) 48 Months
Hydrogen Chloride (HCl) 12 Months
Hydrogen Cyanide (HCN) 12 Months
Hydrogen Sulfide (H2S) 18 Months
Isobutylene (C4H8) 48 Months
Methane (CH4) 48 Months
Nitric Oxide (NO) 12 Months
Nitrogen Dioxide (NO2) 6 Months
Nitrous Oxide (N2O) 12 Months
Oxygen (O2) 48 Months
n-Pentane (C5H12) 48 Months
Propane (C3H8) 48 Months
Sulfur Dioxide (SO2) 18 Months
Zero Air, Zero Nitrogen 48 Months

How Do I Know When My Calibration Gas Cylinder Has Expired?
All Gas Dynamics calibration gas cylinders include an expiration date on the front (component) label. Cylinders should not be used beyond this date.

Gas Dynamics, LLC
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