The non-electrical flow meter is intended solely for measuring the consumed water. The data acquisition rate of all sensors should be 1/s. As far as I understand, the electrical measuring unit (Siemens 7KM2200-2EA30-1JA1 SENTRON digital DIN rail meter 7KM PAC2200, 3-phase, 5 A, DIN rail, Modbus) offers a wide range of options to customize the device according to your specific needs. Or did I misunderstand something? Would a direct measurement without current transformers perhaps be a better solution?