2.1 Pure gases
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2.1 Pure gases

  2.1.1 The required purity of the gases is defined by the contamination limits given below. The following gases shall be available for operation of the test-bed measurement procedures:

  • .1 purified nitrogen (contamination ≤ 1 ppm C, ≤ 1 ppm CO, ≤ 400 ppm CO2, ≤ 0.1 ppm NO);

  • .2 purified oxygen (purity > 99.5% volume O2);

  • .3 hydrogen-helium mixture (40 ± 2% hydrogen, balance helium), (contamination ≤ 1 ppm C, ≤ 400 ppm CO); and

  • .4 purified synthetic air (contamination ≤ 1 ppm C, ≤ 1 ppm CO, ≤ 400 ppm CO2, ≤ 0.1 ppm NO), (oxygen content between 18 and 21% by volume).

Parent topic: 2 Calibration gases
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