近年，随着国家数字化,传感器被列为新基建信息基础设施之一。然而我国传感器产业还存在数字化、智能化、微型化产品严重欠缺的“短板”。技术含量较低，应用方式初级，集成度不高的事实，而微型精细化传感器被国外品牌占据市场。

传统的电容式液位传感器有电极裸露在水中，水作为介质改变电极间的电容，从而检测水位的变化；传统的水阻型液位传感器，有多个电极，但水没过电极的时候，电极之间有微弱的电流流过，由此检测水位变化；上述两种传感器如果应用到在温度较高、水质较差的水中，更容易结垢覆盖电极而导致检测失效。磁性浮子和干簧管型的液位传感器也会因浮子上结满水垢而卡死，导致液位检测失灵。

就目前而言，市场上检测多段液位产品，普遍采用多个浮球串联组成，引线多，需要拧螺母安装，价格居高不下，且很多需要与液体接触，极大的影响了使用体验，增加了系统集成的难度。

解决传统浮球方式检测液位，需要浮球或者检测杆长期浸泡液体中，产生大量水垢，油垢，不利于清洗。长时间日光照射材质发黄，发粘，浮球易失灵。若应用场景为饮用水，水箱内漂浮着异物，不环保且不美观，从消费者心理接受度差，用户体验非常不友好。

本发明实时输出电信号，不再像以前靠人工识别是否缺水，人工感知水位液位信息这种粗放的方式，极大的提升使用合适度，具有很强的技术附加值。

本实用新型的目的在于提出一种非接触式电容感应多段液位传感器，克服己有液位传感器在酸碱度含量较高、腐蚀性较强的液体中使用寿命不长的不足，同时还可方便地对不同材质、壁厚容器中水或其他液体、或其它颗粒进行检测，本实用新型即便在恶劣环境下也能长期高效使用，并大大提高了检测电路工作状态的准确性、稳定性和可靠性，且安装极其简单方便。

In recent years,  sensors have been listed as one of the new infrastructure information infrastructures.

The traditional capacitive liquid level sensor has electrodes exposed in the water, and water is used as a medium to change the capacitance between the electrodes, thereby detecting changes in the water level; the traditional water resistance liquid level sensor has multiple electrodes, but when the water passes through the electrodes, the electrodes There is a weak current flowing between them to detect water level changes; if the above two sensors are applied to water with higher temperature and poor water quality, it is easier to scale and cover the electrodes and cause detection failure. Magnetic floats and reed tube type liquid level sensors will also be stuck due to scales on the floats, causing liquid level detection to fail.

As far as the current situation is concerned, multi-stage liquid level products on the market generally use multiple floats in series. There are many leads and nuts need to be screwed for installation. The price remains high, and many of them need to be in contact with liquids, which greatly affects the use experience. Increased the difficulty of system integration.

To solve the traditional floating ball method to detect the liquid level, the floating ball or the detection rod needs to be immersed in the liquid for a long time, which produces a large amount of scale and grease, which is not conducive to cleaning. The material becomes yellow and sticky after long time sunlight, and the float ball is easy to fail. If the application scenario is drinking water, there are foreign objects floating in the water tank, which is not environmentally friendly and unsightly, the psychological acceptance from consumers is poor, and the user experience is very unfriendly.

The present invention outputs electrical signals in real time, no longer relying on manual identification of water shortage and manual perception of water level and liquid level information, which greatly improves the suitability of use and has strong technical added value.

The purpose of the utility model is to propose a non-contact capacitive sensing multi-stage liquid level sensor, which overcomes the short service life of the existing liquid level sensor in the liquid with high pH content and strong corrosiveness, and at the same time it can be conveniently For detecting water or other liquids or other particles in containers of different materials and wall thicknesses, the utility model can be used efficiently for a long time even in harsh environments, and greatly improves the accuracy, stability and reliability of the working state of the detection circuit , And installation is extremely simple and convenient.