Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 20.9% O2 – 116L 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.
The concentration profile supports facilities operating with conservative carbon monoxide alarm thresholds while maintaining full combustible and oxygen sensor verification:
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25 PPM Hydrogen Sulfide for toxic exposure sensor validation
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50 PPM Carbon Monoxide calibration for lower CO setpoints
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2.5% Methane (50% LEL) for combustible sensor accuracy
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20.9% Oxygen for atmospheric baseline confirmation
This mixture is widely specified across wastewater facilities, oil & gas operations, utilities, manufacturing plants, and industrial hygiene programs requiring OSHA-aligned confined space monitoring.
The 116L cylinder supports extended calibration cycles, making it ideal for safety departments managing multiple monitors or continuous shift operations.
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 | 116L (4.0 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 preserve concentration stability and maintain calibration accuracy.
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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High-frequency daily bump testing
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Scheduled multi-monitor calibration programs
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OSHA confined space compliance
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Lower CO alarm threshold verification
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Facility-wide gas detection fleet management
The 116L format provides extended service life between cylinder replacements while maintaining portability for industrial environments.
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.
