Product Description
4-Gas Calibration Gas – 25 PPM H2S / 50 PPM CO / Methane (CH₄) 2.5% (50% LEL) / 19.5% O2 – 116L 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 entry and industrial safety programs.
Unlike atmospheric baseline blends containing 20.9% oxygen, this mixture contains 19.5% oxygen, the OSHA-defined oxygen-deficiency threshold. This enables verification of low-oxygen alarm activation while simultaneously validating toxic and combustible sensor performance.
Concentration profile:
-
25 PPM Hydrogen Sulfide for toxic exposure sensor validation
-
50 PPM Carbon Monoxide calibration for conservative CO alarm setpoints
-
2.5% Methane (50% LEL) for combustible sensor accuracy
-
19.5% Oxygen to simulate oxygen-deficient atmospheric conditions
This blend is widely specified for OSHA-aligned confined space compliance across wastewater facilities, oil & gas operations, utilities, and industrial manufacturing environments.
The 116L cylinder supports extended calibration cycles for facilities managing multiple detectors or high-frequency 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 | 116L (4.0 ft³) |
| Pressure | 1000 psi |
| Cylinder Specification | C-10 |
| Cylinder Material | Aluminum |
| Gas Reactivity | Reactive |
Reactive multi-gas blends should be stored and used with compatible C-10 regulators to preserve mixture stability and maintain calibration precision.
Applications & Detector Compatibility
This 4-gas calibration gas supports 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:
-
Oxygen-deficiency alarm verification
-
High-volume daily bump testing
-
Scheduled multi-monitor calibration programs
-
OSHA confined space compliance
-
Facility-wide gas detection fleet management
The 116L format offers extended service life between cylinder replacements while maintaining portability for industrial environments.
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.
