7 Del. Admin. Code § app G § 1124-A-G-5.0 - Calibration gases and other gases

5.1 Gases used for calibration, fuel, and combustion air shall be contained in compressed gas cylinders.

5.2 Preparation of calibration gases shall be done according to the procedure in Protocol No. 1, listed in the reference in 12.2 of this appendix.

5.3 The recommended shelf life for each calibration gas cylinder over which the concentration does not change more than ±2% from the certified value shall be obtained from the cylinder manufacturer.

5.4 The following calibration and other gases shall be used:

5.4.1 Fuel. A 40% hydrogen and 60% helium or 40% hydrogen and 60% nitrogen gas mixture to avoid an oxygen synergism effect that reportedly occurs when oxygen concentration varies significantly from a mean value.

5.4.2 Zero gas. High purity air with less than 0.1 parts per million by volume (ppmv) of organic material methane or carbon equivalent or less than 0.1% of the span value, whichever is greater.

5.4.3 Low-level calibration gas. Propane calibration gas (in air or nitrogen) with a concentration equivalent to 20 to 30% of the applicable span value.

5.4.4 Mid-level calibration gas. Propane calibration gas with a concentration equivalent to 45 to 55% of the applicable span value.

5.4.5 High-level calibration gas. Propane calibration gas with a concentration equivalent to 80 to 90% of the applicable span value.

Notes

7 Del. Admin. Code § app G § 1124-A-G-5.0