Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 19.5% O2 – 44L 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.
Unlike atmospheric baseline blends containing 20.9% oxygen, this mixture contains 19.5% oxygen, the OSHA-defined oxygen-deficiency threshold. This allows technicians to verify low-oxygen alarm activation while simultaneously validating toxic and combustible sensor performance.
Concentration profile:
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25 PPM Hydrogen Sulfide for toxic sensor verification
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50 PPM Carbon Monoxide calibration for conservative CO alarm thresholds
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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 used in wastewater facilities, oil & gas operations, utilities, and manufacturing environments conducting OSHA-aligned confined space compliance programs.
The 44L cylinder format offers a compact, field-ready calibration solution ideal for mobile safety teams and short-cycle bump testing routines.
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 | 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 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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Portable service fleet calibration
The 44L size provides a balance between portability and calibration longevity for routine safety programs.
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.
