The flow sensor is not used to measure the flow rate. A flow sensor is a simple and inexpensive device that determines whether there is flow or not. The FLS series flow sensors are a series of electro-mechanical liquid flow sensors, primarily for use in heating and cooling installations. The FLS range of flow switches allows the user to control the flow of water or corrosive media. They have a built-in safety switch that alerts the user about lack of flow.
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