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What is the wiring method when using a PF2A7 series digital flow switch only for flow rate display viewing?: Wire only the following 2 points: 1. brown to 24 VDC (positive) and 3. blue to 24 VDC (minus). Insulate all wires that are not used. As setting is not required, the flow rate will be displayed as is. The total flow rate can also be checked via the switch buttons.