A pressure transducer for determining atmospheric pressure and evapotranspiration with a hydraulic weighing lysimeter
The construction and recording of pressure transducers for measuring atmospheric pressure and total pressure, i.e. a hydraulic weighing lysimeter, is described. The principle of operation consists of a variable concentric capacitor to control the frequency of oscillation of a free-running multivibra...
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Published in | Agricultural meteorology Vol. 26; no. 4; pp. 273 - 278 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
1982
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Subjects | |
Online Access | Get full text |
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Summary: | The construction and recording of pressure transducers for measuring atmospheric pressure and total pressure, i.e. a hydraulic weighing lysimeter, is described. The principle of operation consists of a variable concentric capacitor to control the frequency of oscillation of a free-running multivibrator. The sensitivity of the transducers was 84 Pa Hz
−1 and 8 mm H
2O Hz
−1. Techniques which would increase the resolution of atmospheric pressure to 0.7 Pa and of a standpipe to 0.06 mm H
2O are discussed. The temperature coefficient of the transducers is about 0.5 Hz°C
−1. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0002-1571 |
DOI: | 10.1016/0002-1571(82)90044-9 |