Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / 2.5% (50% LEL) CH4 / 18.0% O2 – 120L 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.
Containing 18.0% oxygen, this mixture simulates severe oxygen-deficient atmospheric conditions significantly below OSHA’s 19.5% threshold. It enables technicians to validate oxygen alarm activation under aggressive depletion scenarios while simultaneously verifying toxic and combustible sensor performance.
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 setpoints
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2.5% Methane (50% LEL) for combustible sensor accuracy
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18.0% Oxygen for deep oxygen-deficiency simulation
This blend is commonly specified for advanced confined space training, emergency response simulation exercises, industrial hygiene audits, and facilities operating with internal oxygen alarm thresholds below regulatory minimums.
The 120L cylinder supports extended calibration cycles and high-frequency bump testing programs, reducing cylinder replacement intervals for large safety departments managing multiple monitors.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 50 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 18.0% |
| Balance | Nitrogen |
Cylinder Specifications
| Property | Value |
|---|---|
| Cylinder Size | 120L (4.2 ft³) |
| Pressure | 1050 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
Reactive multi-gas blends should be used with compatible C-10 regulators to maintain mixture stability and calibration precision.
Applications & Detector Compatibility
Compatible with most major portable multi-gas monitors used for toxic, combustible, and oxygen detection, including instruments from BW, MSA, Industrial Scientific, RAE Systems, and Dräger.
Common applications include:
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Severe oxygen-deficiency alarm verification
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Confined space emergency simulation
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Advanced safety training programs
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High-volume daily bump testing
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Facility-wide gas detection fleet management
The 120L format is ideal for continuous-shift environments and multi-department safety operations.
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.
