Product Description
4-Gas Calibration Gas – 25 PPM H2S / 250 PPM CO / 2.5% (50% LEL) CH4 / 20.9% O2 – 44L C-10 Cylinder
This 4-gas calibration gas blend is engineered for elevated carbon monoxide alarm validation under normal atmospheric oxygen conditions.
With 250 PPM Carbon Monoxide, this mixture supports facilities operating with higher CO alarm setpoints or validating worst-case combustion exposure scenarios. The inclusion of 20.9% oxygen maintains ambient atmospheric reference, ensuring toxic and combustible channel testing remains unaffected by oxygen-depletion variables.
Concentration profile:
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25 PPM Hydrogen Sulfide for H₂S sensor verification
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250 PPM Carbon Monoxide for high-threshold CO alarm calibration
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2.5% Methane (50% LEL) for combustible sensor accuracy
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20.9% Oxygen to confirm atmospheric baseline
Commonly specified for:
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Boiler room safety programs
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Engine exhaust and combustion monitoring
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Manufacturing and heavy industry compliance
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Portable detector fleet calibration
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Industrial maintenance audits
The 44L cylinder provides a compact, field-deployable solution for elevated CO validation without transitioning to high-capacity cylinders.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 250 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 20.9% |
| 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 require compatible C-10 regulators to maintain mixture integrity and ensure calibration precision.
Applications & Detector Compatibility
Compatible with leading portable and fixed multi-gas detection platforms from BW, MSA, Industrial Scientific, RAE Systems, and Dräger.
Ideal for:
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Elevated CO alarm validation
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Combustion safety compliance
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Multi-sensor bump testing
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Industrial plant inspections
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Fleet calibration programs
The 44L format supports efficient high-CO calibration for technicians requiring portability and moderate volume.
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 tailored to your detector model, regulatory requirements, or site-specific hazard profile.
