Product Description
4-Gas Confined Space Calibration Gas – 25 PPM H2S / 50 PPM CO / 2.5% (50% LEL) CH4 / 20.9% O2 – 44L
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 reduced carbon monoxide alarm setpoints:
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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 thresholds
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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 commonly used in wastewater treatment plants, oil & gas sites, utilities, and industrial manufacturing environments requiring OSHA-aligned confined space compliance.
The 44L cylinder provides a compact, field-friendly calibration solution for mobile technicians and short-cycle bump testing programs.
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 | 44L (1.5 ft³) |
| Pressure | 750 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 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 equipment 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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Lower CO alarm verification
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Portable service fleet calibration
The 44L format balances portability with sufficient calibration volume for routine safety programs.
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.
