Water level sensor is an instrument that can automatically determine and record the water level of water bodies such as rivers, lakes and irrigation canals. In practical application, according to the different scale and form of project works, different development needs, different application location, the choice of water level meter is different. With the development of society, the progress of the times, the quality of the project excellence, the accuracy of the signal acquisition to improve the practical performance of the product enhancement, less investment, occupies a small area, the construction of a convenient water level meter, will be more and more water conservancy projects to choose.
1.Bubble Water Level SensorA tube with air capacity at the upper end is inserted into the water, and a small amount of air is passed into the tube with a constant flow, and the current water level can be converted by measuring the air pressure inside the tube. Bubble type water level gauge only a gas tube into the water, test and then pressurized, usually in the no-pressure or micro-pressure state, so the drift is very small, do not need to be timed rate fixing.
Scope of Application and Characteristics:(1) High measurement accuracy (millimeter level), large range (up to 70m or more), maintenance-free, vibration-resistant, long life;
(2) With simple installation, flexible operation and networking, the instrument only needs to put the gas guide tube and gas capacity into the water, without building a logging well, saving investment in civil construction;
(3) Especially suitable for flowing water, large and small rivers, reservoirs, or water pollution and corrosive industrial wastewater and other occasions;
(4) Equipment and the body of water to be measured completely without "electrical" connection, only a gas pipe into the water, thus avoiding a lot of interference, influence, constitute its own use of characteristics, data stability and reliability.
2. Radar Water Level SensorRadar water level meter uses radar waves to measure the distance to the water surface, which is actually a radar rangefinder. Radar wave measurement is not affected by temperature, humidity, wind speed, rainfall and other environmental factors. The radar water level meter measures the water level in a non-contact way, which is also not affected by the water body, and the accuracy reaches the first grade accuracy.
Scope of Application and Characteristics:(1) High measurement accuracy (millimeter level) and large range (up to 70m or more);
(2) Only need to place the probe above the water surface, can not build a logging well, saving investment in civil construction;
(3) Non-contact measurement, not polluted by the water body, does not damage the water flow structure;
(4) Not affected by temperature, humidity, wind speed, rainfall and other environmental factors, stable and reliable data.
3. Input Pressure
Water Level SensorAccording to the principle of hydrostatic pressure which is directly proportional to the pressure and depth of water, using pressure-sensitive components as the sensor of the water level meter. When the sensor is fixed in a measurement point underwater, the measurement point above the water column pressure height plus the elevation of the point, you can indirectly measure the water level.
Scope of application and characteristics:(1) High measurement accuracy (millimeter level), large range (up to 100m);
(2) Simple installation, the instrument only needs the pressure sensor into the water, can not build a logging well, saving investment in civil engineering;
(3) The cost of equipment is relatively low, and the installation is also relatively simple.
At present, the commonly used water level meter also float type water level meter, laser water level meter, ultrasonic water level meter and so on, need to be based on different use requirements and combined with different environments, choose the right water level meter.
