A study for a downward extension of the low range primary humidity generator (PHG) has been undertaken at IMGC-CNR. The new system is intended for trace moisture generation with molar fractions lower than 10-6 mol/mol. It consists of a dilution and mixing stage cascaded to the low range PHG output. A detailed analysis of the system operation is reported and the various uncertainty sources discussed. A preliminary comparison in a frost point temperature range from –80 °C to –50 °C was carried out. The predicted frost point temperatures of the flow-mixing system compare favourably with the measured values. An agreement of better than 0,06 °C with the PHG reference temperature was found. Initial tests have also shown a repeatability to within 0,1 °C over the investigated range.
A Dilution and Mixing Stage for a Frost Point Humidity Generator / Fernicola, Vito; Banfo, M.. - (2002), pp. 121-127. (Intervento presentato al convegno 4th International Symposium on Humidity and Moisture - Taipei nel 16-19 settembre).
A Dilution and Mixing Stage for a Frost Point Humidity Generator
FERNICOLA, VITO;
2002
Abstract
A study for a downward extension of the low range primary humidity generator (PHG) has been undertaken at IMGC-CNR. The new system is intended for trace moisture generation with molar fractions lower than 10-6 mol/mol. It consists of a dilution and mixing stage cascaded to the low range PHG output. A detailed analysis of the system operation is reported and the various uncertainty sources discussed. A preliminary comparison in a frost point temperature range from –80 °C to –50 °C was carried out. The predicted frost point temperatures of the flow-mixing system compare favourably with the measured values. An agreement of better than 0,06 °C with the PHG reference temperature was found. Initial tests have also shown a repeatability to within 0,1 °C over the investigated range.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
