Product Description
4-Gas Calibration Gas – 25 PPM H2S / 90 PPM CO / 2.5%(50% LEL) CH4 / 20.9% O2 – 34L C-10 Disposable Cylinder
This 4-gas calibration gas is engineered for routine bump testing and full calibration of portable multi-gas monitors used in confined space entry and industrial safety environments.
The concentration profile reflects one of the most widely specified OSHA-aligned 4-gas mixtures:
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25 PPM Hydrogen Sulfide for toxic exposure sensor 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 commonly used in wastewater treatment, oil & gas operations, utilities, manufacturing plants, and industrial hygiene programs.
The 34L disposable format provides a compact, lightweight solution ideal for mobile technicians, service fleets, and lower-volume calibration programs.
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 | 34L (1.2 ft³) |
| Pressure | 500 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
| Cylinder Type | Disposable |
Reactive multi-gas blends require proper storage and compatible regulators to preserve concentration stability and calibration accuracy.
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 uses include:
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Daily bump testing
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Scheduled calibration verification
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OSHA confined space compliance
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Pre-entry atmospheric testing
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Safety audits and documentation
The 34L cylinder is particularly suited for portable service kits and short-cycle calibration routines.
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.
