Product Description
4-Gas Calibration Gas – 25 PPM H2S / 90 PPM CO /2.5% (50% LEL) CH4 / 20.9% O2 – 60L C-10 Cylinder
This 4-gas calibration gas blend is designed for routine calibration and bump testing of portable multi-gas monitors used in confined space entry and industrial safety environments.
The 25 PPM H₂S and 90 PPM CO concentrations verify toxic sensor response thresholds, while 2.5% methane (50% LEL) confirms combustible sensor accuracy. Oxygen at 20.9% validates atmospheric baseline calibration.
This mixture is widely specified for OSHA-aligned confined space monitoring programs across:
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Wastewater treatment facilities
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Oil & gas operations
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Utility maintenance crews
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Industrial manufacturing plants
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EHS and industrial hygiene departments
The 60L cylinder offers a practical balance between portability and calibration longevity, making it well suited for mobile safety teams and routine fleet service applications.
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 | 60L (2.1 ft³) |
| Pressure | 1000 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
Reactive multi-gas blends should be stored in accordance with manufacturer guidelines and used with compatible C-10 regulators to preserve mixture integrity and calibration accuracy.
Applications & Detector Compatibility
This 4-gas calibration gas is compatible with most leading portable multi-gas monitors used for toxic, combustible, and oxygen detection, including models 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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Safety audits and documentation
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Pre-entry atmospheric verification
The 60L format supports frequent calibration cycles while remaining easy to transport in field service vehicles.
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.
