What type of device is used to detect the flow direction of liquids?

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A flow switch is specifically designed to detect the flow direction of liquids. This device operates by sensing whether the liquid is moving through a pipe and, crucially, can determine the direction in which that liquid is flowing. Flow switches often incorporate mechanisms like a paddle or a spinning turbine that react to the movement of the fluid, allowing them to trigger alarms or control other systems based on flow conditions.

In contrast, flow meters primarily measure the flow rate of liquids without necessarily providing information about the direction of flow. Pressure sensors are used to measure the pressure within a system, which does not directly correlate with the flow direction. Temperature gauges monitor the temperature of a fluid but do not provide data related to its flow characteristics. Thus, for the specific purpose of detecting flow direction, a flow switch is the most suitable device.