Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 19.5% O2 – 34L C-10 Disposable 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 environments.
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 response.
Concentration profile:
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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 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 specified for confined space compliance programs across wastewater facilities, oil & gas operations, utilities, and industrial manufacturing plants.
The 34L disposable cylinder provides a compact, lightweight calibration solution ideal for field technicians, mobile safety kits, and lower-volume 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) | 19.5% |
| 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 should be stored and used with compatible C-10 regulators to maintain concentration stability and ensure 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 fleet service calibration
The 34L format is particularly suited for technicians requiring maximum portability and quick deployment in field conditions.
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.
