Product Description
4-Gas Calibration Gas – 25 PPM H2S / 90 PPM CO / 2.5% (50% LEL) CH4 / 20.9% O2 – 44L C-10 Cylinder
This 4-gas calibration gas blend is engineered for routine bump testing and calibration of portable multi-gas monitors used in confined space and industrial safety applications.
The mixture includes:
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25 PPM Hydrogen Sulfide for toxic sensor verification
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90 PPM Carbon Monoxide for combustion exposure detection
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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 concentration profile aligns with commonly specified OSHA confined space monitoring programs across wastewater, utilities, oil & gas, and manufacturing environments.
The 44L cylinder format is ideal for technicians requiring a lightweight, compact calibration solution for service vehicles, plant walk-throughs, and routine compliance testing.
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 | 44L (1.5 ft³) |
| Pressure | 750 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
Reactive multi-gas blends require proper storage conditions and compatible regulators to maintain mixture stability and calibration integrity.
Applications & Detector Compatibility
This 4-gas calibration gas supports most major portable multi-gas detectors used for toxic, combustible, and oxygen monitoring, including equipment from BW, MSA, Industrial Scientific, RAE Systems, and Dräger.
Common operational 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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Safety audits and reporting
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Pre-entry atmospheric verification
The 44L cylinder is particularly suited for technicians who prioritize portability and quick deployment.
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.
