... loss,low demand in straight pipe;3.Totally deal with digital quantity, high anti-interference,reliable measurement,high precision, ... and D-value calculation;7.With RS485 or RS232 digital communication signal output;8.With self-check and diagnosis functions ... 250mA current and withstanding 35V voltage(Not isolated with pulse output)Digital communicationsRS232,RS485,HART(add specially)Explosion proof ...