... 2.Highly intelligentized 3.Small volume fuel consumption flow metersFeature:1.Positive/negative/net flow or heat totaliser.2.MODBUS/MBUS/HIPEAK ... to 1000m Powerful FunctionsCurrent output: 4-20mA, one channel, can be used for flow/heat transmitterOCT output: two channels, can be used ... for flow /heat switchCurrent input: 4-20mA, three channels, can be ...