Laboratory calibration of pressure transducer-tensiometer system for hydraulic studies

Abstract

Laboratory calibrations of 20 pressure transducer-tensiometers (PTTs) were conducted under constant pressures of 0, -25, -50 and -75 kPa and constant temperatures of 5, 15, 25 and 48°C. Twenty Bourdon gauge tensiometers and pressure transducers were also calibrated to check changes in the sensitivity and effectiveness of the PTT system. Readings of all the three systems revealed that pressure values gradually declined with an increase in temperature. It is recommended that the complete PTT system should be calibrated in the laboratory to adjust the output readings to the anticipated temperature in the field. -from Authors