... .Highly intelligentized 3.Small volume ultrasonic module Feature: 1.Positive/negative/net flow or heat totaliser.2.MODBUS/ ... -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, ... ,oil,chemicals,beverage&food processors etc. Ultrasonic Module(ZYF-2000M)