Product Description
H₂S 25 PPM / CO 100 PPM / CH₄ 2.5% (50% LEL) / O₂ 19.0% 4-Gas Calibration Gas – 44L 750 PSI
This 4-gas calibration mixture contains:
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Hydrogen Sulfide (H₂S) – 25 PPM
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Carbon Monoxide (CO) – 100 PPM
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Methane (CH₄) – 2.5% (50% LEL)
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Oxygen (O₂) – 19.0%
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Balance Gas – Nitrogen
Engineered for calibration and bump testing of multi-gas monitors requiring oxygen-deficiency alarm validation.
Gas Composition
H₂S 25 PPM / CO 100 PPM / CH₄ 2.5% (50% LEL) / O₂ 19.0%
Balance: Nitrogen
Gas Count: 4
Cylinder Specifications
Cylinder Size: 44L (1.5 Cubic Feet)
Cylinder Pressure: 750 PSI
Valve Type: C-10
Cylinder Material: Aluminum
Gas Reactivity: Reactive
The 44L 750 PSI format provides a balanced capacity suitable for field technicians and recurring compliance programs.
Application Positioning
This blend is formulated to:
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Verify oxygen-deficiency alarm setpoints
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Simulate mild low-oxygen confined space conditions
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Support OSHA-required confined space programs
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Validate sensor response below normal atmospheric levels
Methane at 2.5% equals 50% LEL for combustible sensor testing.
CO at 100 PPM aligns with common low-alarm calibration thresholds.
Why Choose 19.0% Oxygen?
Compared to 20.9% ambient blends, 19.0% oxygen supports alarm-trigger testing without simulating severe deficiency conditions like 17.0% oxygen mixtures.
Need Alternate Oxygen Levels?
This blend is available in 17.0%, 19.0%, and 20.9% oxygen configurations across multiple cylinder sizes. Contact us for custom calibration gas specifications.
