A certain oil production plant is located in Ningxia Hui Autonomous Region, and its main business scope includes: general projects: petroleum product manufacturing (excluding hazardous chemicals); Sales of petroleum products (excluding hazardous chemicals); Research and development of carbon reduction, carbon conversion, carbon capture, and carbon sequestration technologies. Licensed project: onshore oil and gas extraction; Geothermal resource exploitation; Power generation business, transmission business, and power supply (distribution) business.

In April 2025, the company had 4 crude oil vertical tanks that needed to be equipped with external liquid level instruments. Due to safety inspections, an additional set of liquid level switches was required. Dinghua provided excellent service and timely after-sales service, resulting in good product quality. Therefore, Dinghua instrument products were chosen. Since its use, the effect has been good.