Calibration of Pressure Transducer Tensiometers: A Laboratory Study on Air Temperature Dependence of Pressure Transducer Voltage

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  • WAKATSUKI Tsuyoshi
    torm, Flood, and Landslide Research Unit, Observation and Prediction Research Department, National Research Institute for Earth Science and Disaster Prevention
  • HATTANJI Tsuyoshi
    Faculty of Life and Environmental Sciences, University of Tsukuba

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  • 圧力変換式テンシオメータのキャリブレーション：出力電圧への気温の影響に関する一実験
  • アツリョク ヘンカンシキ テンシオメータ ノ キャリブレーション : シュツリョク デンアツ エ ノ キオン ノ エイキョウ ニ カンスル イチ ジッケン

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<p>Pressure transducer (pressure sensor) tensiometers are commonly used to monitor the water pressure head in soil. We performed laboratory experiments using a temperature control equipment to clarify the effect of air temperature on output voltage obtained from pressure sensors. We suggested a new calibration formula using the output voltage and air temperature. Under constant pressure head conditions, the decrease in pressure head calculated from the output voltage was linear and ranged between 0.13 and 0.43 cmH2O per 1°C rise in air temperature (4-13 cmH2O per 30°C air temperature rise). The output voltage decreased with an increase in the volume of air in the tensiometers. To obtain the accurate values regarding the pressure head variation, water level in body pipes of the pressure transducer tensiometers should be so high that the part connected to the pressure sensor is immersed in water.</p>

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