Humidity generator with a test chamber system

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14 Citations (Scopus)

Abstract

For the calibration of relative humidity hygrometers and dew-point hygrometers with an open sensor, a test chamber system was constructed and connected to a dew-point generator. The system includes several small chambers connected in series. By reversing the flow direction, humidity and temperature gradients in the test chamber system are monitored during calibration measurements. This paper reports the construction of the test chamber system and the improvements in the construction and the analysis of the dew-point generator. A full uncertainty analysis is presented. The expanded uncertainty of the dew-point temperature and the relative humidity with the coverage factor k = 2 are from ±0.05°C to ±0.08°C and from ±0.1%rh to ±1.0%rh, respectively. Although the dew-point temperature range is from -40°C to +77°C, the limits for the temperature range of the test chamber system are -20°C and +60°C. The system was not tested with relative humidity values lower than 10% or higher than 95%.

Original languageEnglish
Pages (from-to)307-313
Number of pages7
JournalMeasurement
Volume25
Issue number4
DOIs
Publication statusPublished - 1 Jan 1999
MoE publication typeA1 Journal article-refereed

Fingerprint

dew point
test chambers
humidity
Atmospheric humidity
generators
Hygrometers
hygrometers
Calibration
Uncertainty analysis
gradients
Thermal gradients
Temperature
reversing
temperature
temperature gradients
chambers
Sensors
sensors

Keywords

  • dew-point temperature
  • relative humidity
  • humidity generator
  • test chamber system
  • calibration

Cite this

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title = "Humidity generator with a test chamber system",
abstract = "For the calibration of relative humidity hygrometers and dew-point hygrometers with an open sensor, a test chamber system was constructed and connected to a dew-point generator. The system includes several small chambers connected in series. By reversing the flow direction, humidity and temperature gradients in the test chamber system are monitored during calibration measurements. This paper reports the construction of the test chamber system and the improvements in the construction and the analysis of the dew-point generator. A full uncertainty analysis is presented. The expanded uncertainty of the dew-point temperature and the relative humidity with the coverage factor k = 2 are from ±0.05°C to ±0.08°C and from ±0.1{\%}rh to ±1.0{\%}rh, respectively. Although the dew-point temperature range is from -40°C to +77°C, the limits for the temperature range of the test chamber system are -20°C and +60°C. The system was not tested with relative humidity values lower than 10{\%} or higher than 95{\%}.",
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Humidity generator with a test chamber system. / Heinonen, Martti.

In: Measurement, Vol. 25, No. 4, 01.01.1999, p. 307-313.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Humidity generator with a test chamber system

AU - Heinonen, Martti

PY - 1999/1/1

Y1 - 1999/1/1

N2 - For the calibration of relative humidity hygrometers and dew-point hygrometers with an open sensor, a test chamber system was constructed and connected to a dew-point generator. The system includes several small chambers connected in series. By reversing the flow direction, humidity and temperature gradients in the test chamber system are monitored during calibration measurements. This paper reports the construction of the test chamber system and the improvements in the construction and the analysis of the dew-point generator. A full uncertainty analysis is presented. The expanded uncertainty of the dew-point temperature and the relative humidity with the coverage factor k = 2 are from ±0.05°C to ±0.08°C and from ±0.1%rh to ±1.0%rh, respectively. Although the dew-point temperature range is from -40°C to +77°C, the limits for the temperature range of the test chamber system are -20°C and +60°C. The system was not tested with relative humidity values lower than 10% or higher than 95%.

AB - For the calibration of relative humidity hygrometers and dew-point hygrometers with an open sensor, a test chamber system was constructed and connected to a dew-point generator. The system includes several small chambers connected in series. By reversing the flow direction, humidity and temperature gradients in the test chamber system are monitored during calibration measurements. This paper reports the construction of the test chamber system and the improvements in the construction and the analysis of the dew-point generator. A full uncertainty analysis is presented. The expanded uncertainty of the dew-point temperature and the relative humidity with the coverage factor k = 2 are from ±0.05°C to ±0.08°C and from ±0.1%rh to ±1.0%rh, respectively. Although the dew-point temperature range is from -40°C to +77°C, the limits for the temperature range of the test chamber system are -20°C and +60°C. The system was not tested with relative humidity values lower than 10% or higher than 95%.

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KW - relative humidity

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