Product Description
4-Gas Calibration Gas – 25 PPM H2S / 90 PPM CO / 2.5% (50% LEL) CH4 / 20.9% O2 – 120L C-10 Cylinder
This 4-gas calibration gas blend is engineered for routine bump testing and full calibration of portable multi-gas monitors used in confined space entry and industrial safety programs.
The concentration profile reflects a widely specified OSHA-aligned 4-gas mixture:
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25 PPM Hydrogen Sulfide for toxic exposure sensor verification
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90 PPM Carbon Monoxide for combustion hazard monitoring
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2.5% Methane (50% LEL) for combustible sensor calibration
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20.9% Oxygen for atmospheric baseline confirmation
This blend is commonly used in wastewater facilities, oil & gas production, utilities, manufacturing plants, and industrial hygiene operations where consistent multi-sensor verification is required.
The 120L format supports extended calibration cycles and high-frequency bump testing programs, reducing cylinder replacement intervals and improving operational efficiency for large safety teams.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 90 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 20.9% |
| Balance | Nitrogen |
Cylinder Specifications
| Property | Value |
|---|---|
| Cylinder Size | 120L (4.2 ft³) |
| Pressure | 1050 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
Reactive multi-gas blends require proper storage conditions and compatible regulators to preserve concentration stability and calibration accuracy.
Applications & Detector Compatibility
This 4-gas calibration gas is suitable for most major portable multi-gas monitors used for toxic, combustible, and oxygen detection, including equipment from BW, MSA, Industrial Scientific, RAE Systems, and Dräger.
Common applications include:
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High-frequency daily bump testing
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Scheduled multi-monitor calibration programs
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OSHA confined space compliance
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Large plant safety systems
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EHS department fleet management
The 120L cylinder is ideal for facilities operating multiple monitors across departments or continuous shift environments.
Need a Different Concentration or Cylinder Size?
If you do not see the exact gas mixture, ppm level, LEL percentage, or cylinder size required for your application, contact our calibration gas specialists. We can supply custom multi-gas blends built to your detector model, regulatory requirements, or site-specific hazard profile.
