Product Description
4-Gas Calibration Gas – 25 PPM H2S / 90 PPM CO / 2.5% (50% LEL) CH4 / 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 entry and industrial safety operations.
The concentration profile reflects a commonly specified OSHA-aligned 4-gas mixture:
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25 PPM Hydrogen Sulfide for toxic gas response verification
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90 PPM Carbon Monoxide for combustion hazard monitoring
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2.5% Methane (50% LEL) for combustible sensor calibration
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20.9% Oxygen for atmospheric baseline confirmation
This blend is widely used across wastewater facilities, oil & gas operations, utilities, manufacturing plants, and industrial hygiene programs requiring reliable multi-sensor performance validation.
The 116L cylinder format is ideal for facilities operating multiple detectors or maintaining continuous shift calibration programs, offering longer service life between cylinder replacements.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 90 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 mixture stability and calibration accuracy over time.
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 applications include:
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High-volume daily bump testing
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Scheduled calibration programs
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OSHA confined space compliance
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Plant-wide gas detection systems
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Fleet-based monitor management
The 116L cylinder supports extended operational efficiency for safety departments managing multiple monitors.
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.
