The thermodynamic flowmeter is installed in pipelines to measure flowing liquid. When the fluid comes into contact with its heated probe, it takes away the heat on the probe. By measuring the probe’s change in temperature, the flow rate is measured and converted into a 4~20mA current output, simultaneously measuring both temperature and flow rate. The thermodynamic flowmeter needs to be combined with a screw adapter during assembly. The lock is attached to the pipe, and the sensing probe is inserted into the pipe to measure the temperature and flow rate of the liquid.