Aiming at the current situation of lack of suitable automatic water level measurement equipment for outdoor physical model tests of large-scale hydraulic

river

and port engineering

a probe type precision digital water level meter is designed and developed.The instrument realizes water level measurement by automatically tracking the water surface through the up-and-down movement of the measuring probe.The instrument adopts an integrated structure of host and sensor

integrates a water entry detection circuit

and eliminates measurement errors caused by probe polarization and water conductivity.It also utilizes a wedge type anti-backlash screw that is maintenance-free

and reserves an interface for wireless ad hoc networking

facilitating large-scale wireless communication.Experimental results show that the maximum measurement error of the instrument within a range of 300mm is only 0.01mm

which is one order of magnitude higher than the measurement accuracy required by the model test specifications.The application of the instrument in large-scale physical models such as the downstream tail bay of the Ganjiang River indicates that the instrument is stable and reliable

and has good promotion and application value.