Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / 2.5% Methane (50% LEL)/ 20.9% O2 – 66L 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 and industrial safety programs.
This concentration profile is ideal for applications requiring:
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25 PPM Hydrogen Sulfide toxic sensor verification
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50 PPM Carbon Monoxide calibration for lower alarm thresholds
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2.5% Methane (50% LEL) combustible sensor accuracy
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20.9% Oxygen atmospheric baseline confirmation
The reduced 50 PPM CO concentration supports facilities operating with conservative alarm setpoints or internal safety policies requiring lower calibration targets.
This blend is commonly used across wastewater facilities, oil & gas sites, utilities, and manufacturing environments conducting OSHA-aligned confined space monitoring.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 50 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 20.9% |
| 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 preserve mixture stability and ensure 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 models from BW, MSA, Industrial Scientific, RAE Systems, and Dräger.
Common uses include:
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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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Alarm threshold verification
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Safety program documentation
The 66L format offers a balance between portability and calibration longevity for routine field service operations.
Need a Different Concentration or Cylinder Size?
If you do not see the exact gas mixture, ppm level, LEL percentage, 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.
