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A purge flow meter device is essentially a constant-flow system that combines pressure stabilization, constant current supply, and a flow meter. It can come in either single-meter or panel-mounted forms. Specifically, it must be able to maintain a consistent flow rate despite changes in pressure at the inlet and outlet – this is the most basic function of a purge flow meter. It is primarily used in the chemical and textile industries. To master the most basic methods of using a purge flow meter, it is first necessary to understand its structure and its fundamental functions. Starting with its measurement range, the flow rate for water is approximately 3–100 L/h, while for air it is 50–3400 L/h; the ratio between these ranges is 1:10. The proportion within this range is quite standard, allowing for an easy measurement of its flow rate. After gaining a proper understanding of the purge flow meter, one can identify some of its features. It can be installed in various ways, allowing for the selection of different installation configurations. When it receives a certain signal, it can carry out actual flow measurement operations in response to that signal. It is a relatively simple method that ensures the accuracy of traffic measurement. The main function of a purge flow meter is to enable smooth flow through the use of a constant-flow mechanism; it plays an important role in both the steel industry and oil refining.