Abstract:The observation error is derived from the pressure measurement, water density, and gravity acceleration error. The errors caused by the density and acceleration of gravity is related to the height of the water column. Error analysis results of the water density and gravity acceleration of the water level observation network in China show that the observation error caused by the error of water density and gravity acceleration can be ignored for most of the observation well. In order to reduce the measurement error of the instrument, the water level sensor should not be too deep, and water temperature in the observation well should not be too high. The influence of density cannot be ignored for observation wells with a high degree of mineralization and rich bubbles, and non-artesian wells with high water temperature. Finally, the testing situation of the water level instrument for many years is summarized. In the last few years the test method combining pressure input and simulation wells to test the observation error of net pressure type water level instrument is more scientific and precise.
LIU Chunguo,ZHAO Gang,KONG Lingchang et al. Observation Error and Test Method of Digital Pressure Type Water Level Instrument[J]. jgg, 2018, 38(1): 97-101.