Product Description
4-Gas Calibration Gas – 25 PPM H2S / 250 PPM CO / 2.5% (50% LEL) CH4 / 20.9% O2 – 120L C-10 Cylinder
This 4-gas calibration gas blend is engineered for elevated carbon monoxide threshold validation in large industrial and combustion-driven environments.
With 250 PPM Carbon Monoxide, this mixture supports facilities operating with higher CO alarm setpoints or performing worst-case exposure simulations. The 20.9% oxygen concentration maintains atmospheric baseline conditions, ensuring accurate toxic and combustible sensor calibration without oxygen-depletion influence.
Concentration profile:
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25 PPM Hydrogen Sulfide for H₂S electrochemical 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 channel confirmation
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20.9% Oxygen to maintain ambient atmospheric reference
Commonly specified for:
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Boiler rooms and combustion systems
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Petrochemical and refinery operations
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Engine testing environments
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Heavy manufacturing facilities
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Enterprise multi-detector fleet programs
The 120L cylinder provides extended calibration capacity, reducing changeout frequency for large-scale safety departments managing multiple instruments.
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 | 120L (4.2 ft³) |
| Pressure | 1050 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
Reactive multi-gas blends require compatible C-10 regulators to preserve mixture stability and ensure consistent calibration performance.
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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Industrial plant calibration schedules
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Multi-sensor bump testing
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Process safety management programs
The 120L format supports sustained high-CO calibration operations across enterprise safety 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 tailored to your detector model, regulatory requirements, or site-specific hazard profile.
