Chongqing First Wastewater Treatment Plant The sewage treatment plant reported that the flowmeter suddenly had no display during its use. After the after-sales technicians came to the site, they found that water entered the converter and burned the power module. After on-site testing and communication with on-site staff, they found that the flowmeter was installed in the well cellar. There is no cover in the well cellar, and the on-site power cord is directly transferred from the well head to the upper part. Rainwater enters the converter directly through the cable and burns the power module. After-sales personnel remove the converter and replace the internal power supply board module, and then the converter will work normally. Then lengthen the power cord so that a “U” shape is formed between the power cord and the converter, and rainwater falls on its own at the bottom end of the cable, so that no rainwater can enter the converter.