Detailed Product Description Ultrasonic Flowmeter-Heat Module/flowmeter/water meter1. 40ps ... size from DN15mm to DN6000mm 3. Connect flow/heat module and secondary meter through RS485 interface, transmission ... 420mA, one channel, can be used for flow/heat transmitter OCT output: Two channels, can be used ... for flow /heat switch Current input: 420mA, three channels, can ...