Prasert Mahakit creator Loof, Rainer Chairperson Jensen, N.E. Co-chairperson Wiboon Boonyatharokul Examination committee Van Winden, Jake Examination committee King's Scholarship Scholarship donor text series technical report th Bangkok Asian Institute of Technology 1989 continuing eng 89 p + 1 online resource This study presents the installation of an automated monitoring system for agrometeorological data using data logger CR21 with sensors and lysimeters at the ALWDP experimental field in the Asian Institute of Technology (AIT), Bangkok, during the period of February to June 1989. These instruments collect the data continuously. For the reliability of the instruments all sensors were calibrated in the Calibration Laboratory of the Instrument Division under the Meteorological Department, Bangna, Bangkok, Thailand. Some instruments were recalibrated in the Hydraulics Laboratory of Water Resources Engineering Division and in the Laboratory of Energy Technology Division at AIT. The calibrated results were close to the specifications given in the manuals. The International Standards recommended by the World Meteorological Organization (WMO) and the Food and Agricultural Organization (FAO) were followed for installing these instruments. The observed data from the lysimeters were quite low due to the type of grass, the fine texture of the soil at the site (clay type), high compaction characteristics of the soil and the suction pressure in the water supply tank. The data collected from datalogger for all the instruments agree with data collected from the manually operated instruments. Observations of data by datalogger system are quick, automatic, reliable and reasonably guaranteed. A research study submitted in partial fulfilment of the requirements for the degree of Master of Engineering Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 1989 Meteorology, Agricultural Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B17618 http://203.159.5.9/ait-thesis/detail.php?q=B17618 121095 20260818143417.0