a system is providing for simultaneously addressing the problems of deadhead pumping , dry pumping , and seal failure in progressive cavity pumps . the system uses a hydraulic channel which runs from the pump &# 39 ; s rotor to the pump &# 39 ; s hydraulic motor and includes the spaces defined by the seals for the joints in the drive line for the rotor . at the rotor , the system includes a plug which melts at a predetermined temperature . the hydraulic channel is filled with lubricating oil and is pressurized . a drop in pressure either as a result of the melting of the plug or a break in the integrity of the seals is detected and used to stop the operation of the pump &# 39 ; s motor . the system is resistant to disablement by operators .