Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL)/ 19.5% O2 – 60L 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 environments.
Unlike standard atmospheric blends containing 20.9% oxygen, this mixture contains 19.5% oxygen, which aligns with OSHA’s oxygen-deficiency threshold. This allows technicians to verify low-oxygen alarm activation while simultaneously calibrating toxic and combustible sensors.
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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19.5% Oxygen to simulate oxygen-deficient atmospheric conditions
This blend is commonly specified for confined space compliance programs in wastewater facilities, oil & gas operations, utilities, and industrial manufacturing plants.
The 60L cylinder provides a practical balance between portability and calibration longevity for mobile safety teams and mid-volume monitoring programs.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 50 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 19.5% |
| Balance | Nitrogen |
Cylinder Specifications
| Property | Value |
|---|---|
| Cylinder Size | 60L (2.1 ft³) |
| Pressure | 1000 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 concentration stability and calibration precision.
Applications & Detector Compatibility
This 4-gas calibration gas supports 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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Oxygen-deficiency alarm verification
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Daily bump testing
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Scheduled sensor calibration
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OSHA confined space compliance
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Multi-monitor fleet management
The 60L format supports repeated calibration cycles while remaining suitable for field deployment.
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.
