For diaphragm pump,the reciprocating plunger deflects the diaphragm through volumetric displacement of hydraulic fluid to realize the suction and discharge of fluid by means of suction and discharge valves.Diaphragm totally separates the metered fluid from the environment and the hydraulic liquid. Diaphragm rupture signaling prevents the pumped and hydraulic fluids intermixing in case of diaphragm rupture.Under all operation conditions,the rupture of diaphragm is reliably signaled and the pump driver may be shutdown. The pump returns to normal after replacing the ruptured diaphragm.