At the beginning of the 21st century, there are still many challenges in the industrialization of liquid level sensors. It is reported that there are more than 1700 enterprises engaged in the production and research of liquid level sensors in China. The annual output of liquid level sensors has exceeded 2.4 billion. The products of liquid level sensors have reached 10 categories, 42 categories and more than 6,000 varieties, showing a good development trend. However, among these enterprises, the advantages of foreign-funded enterprises are obvious, with the proportion of foreign-funded enterprises reaching 67%, especially in Japan, the United States, South Korea and Germany. The proportion of state-owned enterprises and national enterprises is only 33%. Domestic and foreign enterprises have great disparity in comprehensive strength, small scale, shortage of talents and weak R&D ability, which make it difficult to compete with foreign enterprises.
More importantly, the domestic level sensor technology is weak.