The sluice gate project with automatic monitoring system plays an important role in flood control and flood prevention, and the water level data monitoring is the basis of the automatic monitoring system, which provides important data support for the safe operation and unified scheduling of the sluice gate project, and the capacity, flow rate and pressure of the water body can be accurately calculated according to the water level data, which is very important for the opening and closing scheduling of the sluice gate, the measurement of the capacity of the water body and the upstream and downstream flow rate of the sluice gate. Powerful to ensure the safety of the sluice gate project. At present, the liquid level meter is widely used in measuring water level. The main types of liquid level meter are: magnetic flap level meter, ultrasonic level meter, radar level meter, laser level meter and so on. With the advantages of economical and practical, easy installation, contactless measurement, wide adaptability and not affected by sludge blockage, scouring and liquid corrosion, ultrasonic level meter is very suitable for water level measurement in sluice gate project.

According to the formula s=vt, the distance s from the transducer of the ultrasonic level meter to the liquid level surface can be calculated. since the speed v of ultrasonic waves propagating in the air is certain, the distance s from the transducer to the liquid level can be calculated by simply calculating the time t between sending and receiving the ultrasonic signal from the ultrasonic level meter. but since the sending and receiving signals take two times the time required for the transducer to reach the liquid level, the actual distance s should be: s=vt/2. So the actual distance s should be: s=vt/2.

　　In the lock station project of the east-west diversion river project, in order to ensure the smooth implementation of the water level monitoring work of the lock station project, the user purchased a number of ultrasonic level meters. As the main building consists of pumping station and ship lock, pumping station consists of upstream and downstream connecting section, cleaning room, pump room, etc., ship lock consists of upstream and downstream pilotage, up and down gate head, gate room, ship lock head and pumping station are arranged adjacent to each other, supporting management room is arranged in the west side of the pumping station, and considering that the project is an internal water channel, the long-term stable water level difference is not large, so finally the project pumping station upstream and downstream water level monitoring and ship lock navigation Water level monitoring is decided to use ultrasonic level meter.

In the purchase of ultrasonic level meter, should pay attention to its range to meet the actual needs, to avoid exceeding the measurement range. In practical application, because the fluctuation of water flow near the gate when the gate opens and closes is generally large, it is easy to make the measurement inaccurate, so it is generally not recommended to install the ultrasonic water level meter in the location near the gate, but should be installed in the water flow fluctuations and no floating objects and vessels near the gentle water flow. In addition, the design warning level of the sluice gate project should be considered to avoid the failure of the equipment when the water level is too high to affect the measurement. kaidi KD series ultrasonic level meter has a good sealing, protection level up to IP66/IP67, its excellent ability to prevent water immersion can also form an effective protection of the instrument, to prevent water mist, dust and ash invasion of the instrument, even if the water level is too high to flood the instrument, a short period of time will not cause damage to the instrument. Even if the water level is too high and floods the meter, it will not cause damage to the meter within a short period of time, which is very suitable for the application of water level monitoring in sluice gate projects.

With the full implementation of the standardized management process of water conservancy projects, sluice gate projects into the "construction and management" of the new mode. The automatic collection of water level data is the basis for the safe operation and management of the sluice gate project, and the use of high-quality ultrasonic level meter can help the management staff to do timely and effective system investigation and maintenance, and strongly guarantee the safe operation of the sluice gate project.