Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / 2.5% Methane (50% LEL)/ 20.9% O2 – 60L 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 and industrial safety environments.
The concentration profile supports facilities operating with more 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 alarm setpoints
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2.5% Methane (50% LEL) for combustible sensor validation
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20.9% Oxygen for atmospheric baseline confirmation
This blend is commonly specified for OSHA confined space entry programs across wastewater facilities, oil & gas sites, utilities, and industrial manufacturing plants.
The 60L cylinder format provides a balanced solution for mobile safety teams and mid-volume calibration programs requiring consistent sensor accuracy.
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 | 60L (2.1 ft³) |
| Pressure | 1000 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 precision.
Applications & Detector Compatibility
This 4-gas calibration gas supports most major portable multi-gas monitors used for toxic, combustible, and oxygen detection, including instruments from BW, MSA, Industrial Scientific, RAE Systems, and Dräger.
Common applications include:
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Daily bump testing
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Scheduled sensor calibration
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OSHA confined space compliance
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Lower CO alarm threshold verification
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Multi-monitor fleet management
The 60L cylinder offers portability while supporting repeated calibration cycles in field service 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.
