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 language | English |
|---|---|
| Pages (from-to) | 307-313 |
| Number of pages | 7 |
| Journal | Measurement |
| Volume | 25 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Jan 1999 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- dew-point temperature
- relative humidity
- humidity generator
- test chamber system
- calibration
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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 journal › Article › Scientific › peer-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%.
KW - dew-point temperature
KW - relative humidity
KW - humidity generator
KW - test chamber system
KW - calibration
UR - http://www.scopus.com/inward/record.url?scp=0032660094&partnerID=8YFLogxK
U2 - 10.1016/S0263-2241(99)00016-0
DO - 10.1016/S0263-2241(99)00016-0
M3 - Article
AN - SCOPUS:0032660094
VL - 25
SP - 307
EP - 313
JO - Measurement
JF - Measurement
SN - 0263-2241
IS - 4
ER -