The gas mixture in calibration gas cylinders is certified to be prepared gravimetrically, using NIST traceable weights
The lot number and nominal value of the gas constituents in volume, percent by mass, PPM, or volume is specified on the cylinder
| Hazard | O2/H2S/CO/CH4 |
| Gas Mix | 4 |
| Litres | 34 |
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| Gas Concentrations | 1.45% CH4, 15% O2, 60 ppm CO, 20 ppm H2S |
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