The SW-II Water Level Gauge is developed to meet the practical needs of the water conservancy, hydropower, and hydrology industries. It is a relatively independent yet intelligent water level measurement and control device with analog signal output for networking. This instrument employs embedded microcomputer control technology, offering powerful functionality, stable and reliable performance, high precision, and strong anti-interference capability. It is suitable for measuring and controlling water level differences in various settings such as rivers, lakes, hydropower stations, irrigation districts, and pumping stations.

The instrument utilizes a multifunctional 16-bit CPU for computation and control. Its hardware includes a watchdog self-reset circuit, and both software and hardware incorporate multiple anti-interference measures, ensuring reliable operation in various industrial environments. The device allows for the setting of various parameters, features flash memory for storing preset parameters, and retains data during power outages.

The SW-II instrument has a simple structure, an aesthetically pleasing appearance, is easy to use, and can operate continuously for extended periods.

II. Features

1. Fully digital calibration: All parameter settings are completed via four buttons on the panel. All set or calibrated parameters have permanent memory retention during power loss.

2. Miniaturized design, gate opening measurement, clear and intuitive Chinese LCD display, and convenient human-machine interaction.

III. Technical Parameters

1. Measurement item: 1 channel for water level

2. Resolution: 1 cm

3. Measurement accuracy: ±2 cm

4. Display method: 4*8 Chinese character library LCD display.

5. Compatible inputs: 4-20mA current signal, RS-485, Gray code

6. Wired distance between sensor and display: ≤1 km

7. Alarm and control functions

1) Alarm control signal: Relay contact. Contact capacity: 3A 24VDC, 3A 250VAC.

2) Upper limit: When the water level exceeds the set value, the relay contact closes;

3) Lower limit: When the water level falls below the set value, the relay contact closes;

8. The microcontroller in the display includes a Watchdog to prevent operational disruptions.