Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 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 operations.
The concentration profile is designed for facilities operating with conservative carbon monoxide alarm thresholds:
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25 PPM Hydrogen Sulfide for toxic exposure sensor verification
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50 PPM Carbon Monoxide calibration for lower CO setpoints
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2.5% Methane (50% LEL) for combustible sensor accuracy
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20.9% Oxygen for atmospheric baseline confirmation
This blend is widely used across wastewater treatment plants, oil & gas operations, utilities, and industrial manufacturing facilities requiring OSHA-aligned confined space monitoring.
The 120L cylinder supports extended calibration cycles and high-frequency bump testing programs, reducing cylinder replacement intervals and improving operational efficiency for larger safety departments.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 50 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 should be stored and used with compatible C-10 regulators to preserve mixture stability and maintain calibration accuracy.
Applications & Detector Compatibility
This 4-gas calibration gas supports 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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Lower CO alarm verification
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Plant-wide gas detection 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.
