本文将集成运算放大器用于电阻触点式液位传感器，研制出一种新型的有源液位传感器，因为集成运算放大器的工作电流很小，克服了电阻触点式电解腐蚀的缺点，使工作可靠、稳定、耗能低、成本低，更容易与测试系统、报警系统、计算机接口联网，是易制造，有推广价值的一种新型液位传感器 In this paper, an integrated operational amplifier is used in the resistance-contact liquid level sensor to develop a new type of active liquid level sensor. Because the working current of the integrated operational amplifier is small, the shortcoming of the resistance-contact electrolytic corrosion is overcome, Reliable, stable, low energy consumption, low cost, easier with the test system, alarm system, computer interface network, is easy to manufacture, there is a promotional value of a new level sensor