Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 19.0% O2 – 44L 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.
Containing 19.0% oxygen, this mixture simulates reduced-oxygen atmospheric conditions below the OSHA 19.5% deficiency threshold. It allows technicians to validate oxygen alarm activation at more aggressive depletion levels while simultaneously verifying toxic and combustible sensor performance.
Concentration profile:
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25 PPM Hydrogen Sulfide for toxic sensor validation
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50 PPM Carbon Monoxide calibration for conservative CO alarm thresholds
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2.5% Methane (50% LEL) for combustible sensor accuracy
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19.0% Oxygen to simulate reduced-atmosphere environments
This blend is commonly specified for advanced confined space training, industrial hygiene audits, and safety programs requiring deeper oxygen alarm validation.
The 44L cylinder provides a compact, field-ready calibration solution ideal for mobile safety teams and portable bump testing kits.
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 | 44L (1.5 ft³) |
| Pressure | 750 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 ensure calibration accuracy.
Applications & Detector Compatibility
Compatible with 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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Reduced-oxygen alarm verification
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Confined space compliance testing
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Safety training simulations
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Scheduled multi-sensor calibration
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Portable fleet service programs
The 44L size balances portability with sufficient calibration volume for routine field operations.
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.
