Abstract：In order to make the installation, calibration, and maintenance of water level meter easy for earthquake monitoring staffs, we decided to upgrade the existing SWYⅠ water level meter to SWYⅡ water level meter, which not only retained the original good performance characteristics, but also absorbed the merits from other water level meters and the suggestions from the Fluid Research Group of China Earthquake Administration.At first, the development of the sensor by ourselves lays the foundation of selfmaintenance and followup upgrading. Second, the processes of selfexamination and examination ensure the high precision of the sensors and also guarantees the interchangeable features of them. Moreover, the display with network interface board uses 32 bit high speed ARM920T as the core processor, which has WINCE Operation System builtin. This design makes the low power consumption and the stable operation system possible. Besides, it is convenient for the insitu calibration and configuration with the new touchscreen on the instrument. Finally, the longdistance maintenance including remote software updating, queries of the work logs, power supply and signal can be achieved by the water level meters of new type.
