Take protection device's micro differential pressure changer

The utility model provides a take protection device's micro differential pressure changer, including sensing portion and control part, its characterized in that: pressure room and intercommunication draw including the first second of pressing the room, connecting low pressure port that draws of connecting high pressure port in sensing portion first drawing presses room and second to draw the balance pressure passageway of pressing the room, balance pressure passageway department is equipped with a balanced valve with the expert that controls this passageway / disconnected, first drawing presses room and second to draw the indoor sensing part that is provided with respectively of pressure, the control part includes controller and communicator, sensing part, balanced valve are connected to respectively the controller, the communicator has the cable interface. The utility model discloses an increase a protection device for micro differential pressure changer operating pressure is no longer than its proof pressur