Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL)/ 19.0% O2 – 66L C-10 Cylinder
This 4-gas calibration gas blend is engineered for bump testing and full calibration of portable multi-gas monitors used in confined space entry and industrial safety programs.
Containing 19.0% oxygen, this blend simulates reduced-oxygen atmospheric conditions below the OSHA 19.5% threshold. It allows verification of oxygen alarm activation at more aggressive depletion levels while simultaneously validating toxic and combustible sensor response.
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, facility safety audits, and operations requiring deeper oxygen alarm validation.
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 | 66L (2.3 ft³) |
| Pressure | 1150 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 maintain mixture stability and calibration accuracy.
Applications & Detector Compatibility
Compatible with most major portable multi-gas monitors used for toxic, combustible, and oxygen detection, including models 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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Multi-sensor calibration programs
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Industrial hygiene audits
The 66L cylinder provides balanced portability with sufficient volume for repeated field calibrations.
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.
