... type output one wayFrenquency range:0~5KHz,uper limit 1~5 optionallySquare wave or pulse with 25ms pulse widthTransistor ... reverse flow,simulation volume exceeds range,pulse volume exceeds range,disconnect pulse small signalTransistor switch output with isolation ... current and withstanding 35V voltage(Not isolated with pulse output)Digital communicationsRS232,RS485,HART(add specially)Explosion ...