The CAPM-3 is a Carrier Frequency sensor which means there is no permanent magnet in the pickup, and any magnetic drag on the flow meter is avoided. The CAPM-3 requires a supply voltage between 10 VDC to 30 VDC. A diode in the supply input prevents damage to the module in case the polarity of the supply voltage is wrong. The output signal is a square wave, voltage pulse of approximate amplitude (supply - 1.5 V). The frequency is proportional to the flow rate.
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