霍尔油位传感器的应用设计

摘要

Fuel level sensor usually adopts beryllium-containing bronze brush and the thicken film resistance. As a mature product, the sensor has the advantages of low price and high technology level, taking the leading position in the industry. However, it also has apparent defect-its lifetime is shorter than expected when the current is switched on. With the rising of fuel price, the inferior gasoline has been widely used. The corrosive substance (such as sulfur and phosphor etc.) can seriously corrode the thickened film. And the butadiene- acrylonitrile rubber floater also contains sulfur. The sulfur can also corrode the thickened film when it is dissolved into the gasoline.%目前,油位传感器普遍采用铍青铜电刷加厚膜电阻形式,作为一类技术成熟的油位传感器,有着无可比拟的价格和技术优势,虽在行业中占据主导地位,但这种传感器也有难以克服的缺陷,在正常通电状态下一般很难达到预期的设计寿命。随着油价上涨,劣质汽油流入市场,汽油中硫磷等腐蚀性物质对厚膜电阻腐蚀严重;耐乙醇汽油的丁晴橡胶浮子在生产过程中残留有硫元素,溶解在汽油中会腐蚀厚膜电阻,这两方面是导致油位传感器使用寿命降低的关键因素。