Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 19.0% 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 and industrial safety programs.
Containing 19.0% oxygen, this mixture simulates reduced-atmosphere conditions below the OSHA 19.5% oxygen-deficiency threshold. It enables technicians to verify oxygen alarm activation at deeper depletion levels while simultaneously validating toxic and combustible sensor performance.
Concentration profile:
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25 PPM Hydrogen Sulfide for toxic exposure sensor validation
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50 PPM Carbon Monoxide calibration for conservative CO alarm setpoints
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2.5% Methane (50% LEL) for combustible sensor accuracy
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19.0% Oxygen to simulate reduced-oxygen environments
This blend is commonly specified for advanced confined space training, industrial hygiene audits, and operations requiring aggressive oxygen alarm verification.
The 120L cylinder supports extended calibration cycles and high-frequency bump testing programs, reducing cylinder replacement intervals for large safety departments.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 50 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 19.0% |
| 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 precision.
Applications & Detector Compatibility
Compatible with 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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Reduced-oxygen alarm verification
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Confined space compliance testing
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Safety training simulations
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High-volume daily bump testing
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Facility-wide gas detection fleet management
The 120L format is ideal for continuous-shift environments and multi-department calibration programs.
Need a Different Concentration or Cylinder Size?
If you do not see the exact gas mixture, ppm level, oxygen percentage, LEL value, 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.
