Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / 2.5% (50% LEL) CH4 / 16.0% O2 – 44L C-10 Cylinder
This 4-gas calibration gas blend is engineered for confined space permit validation and portable multi-gas monitor calibration.
With 16.0% oxygen, this mixture is designed to trigger low-O₂ alarm thresholds under rapid atmospheric depletion conditions. It allows safety managers to confirm that oxygen sensors respond accurately before hazardous exposure levels are reached, while simultaneously verifying toxic and combustible detection channels.
Concentration profile:
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25 PPM Hydrogen Sulfide to validate H₂S sensor sensitivity
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50 PPM Carbon Monoxide for conservative CO alarm confirmation
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2.5% Methane (50% LEL) to verify combustible sensor response
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16.0% Oxygen to confirm low-oxygen alarm activation under severe depletion
This blend is commonly specified for:
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Confined space entry permit programs
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Industrial plant turnaround safety checks
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Tank and vault entry monitoring
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Contractor fleet gas monitor validation
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EHS program compliance audits
The 44L cylinder provides a compact, transportable option ideal for field service teams and scheduled calibration routes.
Gas Concentrations
| Component | Concentration |
|---|---|
| Hydrogen Sulfide (H₂S) | 25 PPM |
| Carbon Monoxide (CO) | 50 PPM |
| Methane (CH₄) | 2.5% (50% LEL) |
| Oxygen (O₂) | 16.0% |
| 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 should be used with compatible C-10 regulators to preserve mixture integrity and calibration precision.
Applications & Detector Compatibility
Compatible with leading portable multi-gas instruments used for confined space monitoring, including BW, MSA, Industrial Scientific, RAE Systems, and Dräger platforms.
Ideal for:
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Permit-required confined space validation
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Low-oxygen alarm confirmation
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Multi-sensor bump testing
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Industrial contractor calibration fleets
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Regulatory inspection preparation
The 44L format balances portability and sufficient gas volume for repeated calibration cycles.
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 provide custom multi-gas blends tailored to your detector model, site conditions, or compliance requirements.
